Before escalating anywhere, Gas Safe Register’s own guidance is clear that the first step with a concern about an engineer’s work is contacting the business directly and asking them to correct it.

Start with the business itself

Gas Safe Register’s guidance sets out that in the first instance, you should contact the business concerned directly and ask them to correct the problem. This isn’t just a formality — a reasonable proportion of installation issues are genuinely resolvable this way, and both Gas Safe Register and any subsequent body you approach will generally expect to see that you’ve tried this route first before escalating.

Gas Safe Register: safety and competence of the gas work itself

If contacting the business directly doesn’t resolve things, Gas Safe Register says it’s happy to investigate concerns about work carried out by a registered engineer, and can be reached through an online form, by email, or by phone. Gas Safe Register’s guidance confirms a regional investigations officer will typically aim to visit the property and inspect the gas work within 10 working days of a report, spending two to three hours on site, with a full written report generally following within 10 working days of that visit. Crucially, Gas Safe Register’s own guidance is explicit that it cannot help with non-gas issues such as contractual or financial disputes, and cannot arbitrate disputes generally — its role is specifically the safety and competence of the gas work itself.

HSE: enforcement, and landlord non-compliance specifically

The Health and Safety Executive (HSE) sits alongside Gas Safe Register with a more enforcement-focused role. HSE’s own guidance specifically addresses tenants who don’t have a current landlord gas safety record, directing them to report this to HSE using form LGSR1, and HSE guidance confirms its inspectors will follow up on repeated attempts by a landlord to avoid necessary safety checks. HSE also runs a free Gas Safety Advice Line for general guidance on gas safety questions, distinct from Gas Safe Register’s engineer-specific investigation process.

Trading Standards: for contractual and consumer issues, not gas safety itself

Because Gas Safe Register explicitly can’t help with contractual or financial disputes, that category of complaint — a dispute over price, a contract not honoured, misleading claims made before you agreed to the work, or a business simply not completing agreed work — is generally a matter for Trading Standards or, for a consumer contract dispute more broadly, the Citizens Advice consumer service as a first point of contact, which can direct a formal complaint through to Trading Standards where appropriate.

Putting it together: which body actually fits your specific problem

If the concern is genuinely about whether the gas work itself was done safely and competently, Gas Safe Register is the right first stop after the business itself. If it’s about a landlord failing to provide a legally required gas safety check, HSE has a specific reporting route for that. If it’s about money, contract terms, or a business’s general conduct rather than the safety of the gas work specifically, Trading Standards or the Citizens Advice consumer service is the appropriate route — sending a purely contractual complaint to Gas Safe Register, for example, will simply be redirected rather than investigated on the safety merits.

FAQs

Can I report an installer to more than one body at once?

Yes — the three bodies covered here handle different aspects of a complaint, so where an issue genuinely spans both gas safety and a contractual dispute, reporting the relevant parts to both Gas Safe Register and Trading Standards (or the Citizens Advice consumer service) isn’t unusual.

What if the installer isn’t Gas Safe registered at all?

This is itself a serious safety and legal issue — working on gas appliances without being Gas Safe registered is illegal, and Gas Safe Register specifically investigates and can take action against unregistered individuals carrying out gas work.

Does making a complaint get my money back?

Not directly — Gas Safe Register and HSE are focused on safety and regulatory compliance rather than financial remedies, so recovering money generally goes through Trading Standards guidance, a Section 75 credit card claim where applicable, or, as a last resort, the small claims court.

Sources

This guide draws on the following primary sources, current as of 18 September 2026:

• Gas Safe Register: Concerns and reporting illegal gas work
• HSE: Domestic gas – frequently asked questions

Related guides

Best Boiler Deals is an independent guide. We may earn a fee from some links; this never affects what we write. This article is general information, not regulated advice on any specific installation — always confirm the details with a Gas Safe registered engineer.

A boiler subscription and boiler finance can look similar on the surface — a fixed monthly amount instead of a large upfront bill — but they’re structurally different products with a different outcome at the end.

The core difference: ownership

Boiler finance spreads the cost of buying a boiler you own outright into fixed monthly instalments, typically over a set term, with some products offered at 0% APR meaning no interest is charged on top of the cash price. A boiler subscription works differently: you’re paying a monthly fee to rent the boiler and, generally, have it installed, maintained and repaired for that fee — but you never own the appliance, and if you stop paying or cancel, the boiler and its ongoing cover go with the arrangement rather than staying yours.

What a subscription typically bundles in

Industry pricing commonly puts boiler subscription costs somewhere in the region of £20 to £60 a month, depending on the provider and boiler specified, with the monthly fee generally covering installation, ongoing servicing and repairs for as long as the subscription continues — effectively combining the boiler, an extended warranty and a service plan into one recurring payment, with no large one-off bill for a breakdown during the subscription term.

What finance typically looks like by comparison

Boiler finance, by contrast, is generally structured as a loan against the purchase price of a specific boiler and installation — commonly in the region of £1,800 to £3,000 for the underlying job, spread over an agreed term. Because it’s financing a purchase you own, ongoing servicing and any repairs after the manufacturer’s guarantee expires are typically your own responsibility to arrange and pay for separately, the same as if you’d paid for the boiler in cash, unless you separately buy a boiler cover plan alongside it.

The long-term cost trade-off

Because a subscription never converts into ownership, industry cost comparisons generally suggest it works out more expensive over the long term than buying the same boiler on finance and owning it outright once the term ends — you keep paying indefinitely for a subscription (or until you cancel and lose the arrangement entirely), whereas finance has a defined end point after which the boiler is yours with no more payments due on it. The trade-off is that a subscription’s fixed monthly fee is genuinely predictable and includes cover most finance arrangements don’t, which suits some households more than a pure cost comparison suggests.

Who each option tends to suit

A subscription can suit someone who specifically values never facing a large unexpected repair bill and prefers one predictable payment covering everything, particularly in a property they don’t expect to stay in for many years. Finance tends to suit someone planning to stay in the property long-term, who wants to own the asset outright once payments finish and is comfortable arranging servicing and any post-guarantee repairs separately, generally the cheaper route over a longer time horizon.

FAQs

Can I cancel a boiler subscription early?

This depends entirely on the specific provider’s contract terms — some allow cancellation with a fee or notice period, others tie you in for a minimum term, so checking the exact cancellation terms before signing matters as much as comparing the headline monthly price.

Does boiler finance always mean paying interest?

Not necessarily — some finance products are offered at 0% APR for qualifying customers and terms, meaning you pay exactly the cash price spread over time with no extra interest cost, though this depends on the specific lender, term and your credit profile.

What happens to a subscribed boiler if the provider goes out of business?

This is a genuine risk worth asking about directly — check what protection or continuity arrangement the provider has in place for exactly this scenario before committing, since a subscription model depends on the provider continuing to trade and service the arrangement.

Sources

This guide draws on the following primary sources, current as of 18 September 2026:

• Boiler Guide: Boilers on finance – pay monthly options

Related guides

Best Boiler Deals is an independent guide. We may earn a fee from some links; this never affects what we write. This article is general information, not regulated advice on any specific installation — always confirm the details with a Gas Safe registered engineer.

Replacing an old, inefficient boiler with a modern condensing model will generally improve your EPC rating to some degree, but the SAP methodology behind your certificate treats it as one factor among several, not a guaranteed jump up a full band.

How SAP actually uses information about your boiler

Your EPC rating is generated using the Standard Assessment Procedure (SAP), the official methodology developed and maintained by the Building Research Establishment (BRE) on behalf of government, and used to assess the energy performance of homes in England and Wales. As part of that calculation, an assessor records your heating system’s details and looks up its rated seasonal efficiency, generally through a database of specific boiler models; where a specific model can’t be identified — common with older or very old boilers — SAP applies a default efficiency figure, and that default tends to be more pessimistic than a genuine well-maintained modern boiler’s real efficiency, which is one reason an old, unidentifiable boiler can drag a score down more than its actual condition might justify.

Roughly how many SAP points a new condensing boiler tends to add

Industry guidance on EPC improvements commonly estimates that replacing a pre-2000, non-condensing boiler with a modern A-rated condensing combi or system boiler adds somewhere in the region of 3 to 8 SAP points, though the exact figure depends heavily on the specific old and new models involved, and some sources cite a wider range where the starting boiler was particularly inefficient or undocumented in SAP’s database. On a property sitting close to a band threshold, that kind of shift can be enough to move up a single EPC band, for example from the upper end of D into C, but it isn’t a guaranteed or fixed outcome across every property.

Why a heat pump moves the needle so much further

The same industry guidance suggests a well-installed air source heat pump can add in the region of 15 to 25 SAP points in a suitably insulated property — a considerably larger jump than a like-for-like gas boiler swap. This reflects how SAP’s methodology treats low-carbon heating: because a heat pump typically delivers multiple units of heat per unit of electricity consumed (a coefficient of performance commonly in the region of 3 to 4), the calculation applies a correspondingly favourable emissions and efficiency factor, in a way a gas boiler, however efficient, structurally can’t match under the same methodology.

What else affects how much a boiler swap actually contributes

SAP doesn’t assess your boiler in isolation — insulation levels, glazing, and the heating controls in place (covered on this site’s guides to heating controls and TRVs) all feed into the overall score alongside the heat source itself. A new boiler installed in a poorly insulated home will still show some improvement from the boiler change specifically, but the overall EPC band achieved depends on the whole package, not the boiler swap in isolation.

Why this might matter to you specifically, beyond curiosity

EPC bands matter beyond simple curiosity — they can affect mortgage products with green incentives, landlord obligations under minimum energy efficiency standards for rented property, and eligibility thresholds for certain grant schemes that use EPC band as a qualifying criterion. If you’re weighing up a boiler replacement partly with an eye on your EPC rating, it’s worth asking a qualified Domestic Energy Assessor what improvement is realistically achievable for your specific property, rather than assuming a generic points figure will apply exactly to your home.

FAQs

Will any new boiler improve my EPC rating?

Generally, replacing an older, less efficient boiler with a modern condensing model should help to some degree, but if your existing boiler is already a relatively modern condensing model, the improvement from a further replacement is likely to be smaller.

Does the brand or specific model of boiler affect the SAP score?

Yes, in principle — SAP looks up rated seasonal efficiency for specific models where they’re in its database, so two boilers with different documented efficiencies can produce slightly different results even if both are modern condensing models.

Is it worth replacing a boiler purely to improve an EPC rating?

It depends on your goal — if you specifically need to cross an EPC band threshold (for a mortgage product, a let property, or a grant scheme), it’s worth getting a professional assessment of what combination of measures, not just a boiler swap alone, will realistically get you there most cost-effectively.

Sources

This guide draws on the following primary sources, current as of 18 September 2026:

• BRE Group: SAP methodology and technical papers

Related guides

Best Boiler Deals is an independent guide. We may earn a fee from some links; this never affects what we write. This article is general information, not regulated advice on any specific installation — always confirm the details with a Gas Safe registered engineer.

If your heating and hot water come from a shared communal or district system rather than your own boiler, you’re on a heat network — a genuinely different arrangement from anything else covered on this site, and one that’s just become formally regulated.

What a heat network actually is

A heat network supplies heat (and often hot water) to multiple properties from a shared central source — a communal boiler or energy centre serving a single block of flats, or a larger district system serving an entire development or neighbourhood — rather than each home having its own individual boiler. If you live somewhere with a heat network, you don’t choose or maintain a boiler at all in the way the rest of this site assumes; instead, you’re a customer of the heat network operator, paying for heat supplied, typically through a meter.

Why heat networks haven’t historically been regulated like gas and electricity

Until recently, heat network customers didn’t have the same statutory protections as gas and electricity customers — there was no equivalent of Ofgem oversight, no price cap, and comparatively limited formal recourse if billing, service quality or supply reliability fell short. The foundational obligations that did exist came from the Heat Network (Metering and Billing) Regulations 2014, which set some baseline requirements around metering and billing, but stopped well short of the fuller consumer protection framework that applies to gas and electricity.

Ofgem becomes the statutory heat networks regulator

The Energy Act 2023 changed this by appointing Ofgem as the dedicated heat networks regulator across England, Scotland and Wales, governing organisations that supply or operate a heat network. Ofgem’s own guidance confirms that from 27 January 2026, it became the statutory heat networks regulator, with a package of consumer protection rules taking effect from that date, including a set of general authorisation conditions that heat network operators and suppliers must now comply with.

What the new protections actually cover

Ofgem’s guidance sets out that the framework is intended to give heat network customers protection broadly comparable to gas and electricity customers, covering standards of conduct, quality of service, billing and transparency (including back-billing limits), the content of heat supply contracts, specific protections for customers in vulnerable situations, and security of supply. Ofgem has also confirmed that the fuller set of regulations is being phased in, with the majority planned to be in place and enforced by January 2027 — meaning the full protection framework is still being rolled out even after the initial January 2026 start date.

What this means if you’re buying or renting a home on a heat network

If you’re considering a property connected to a heat network, rather than one with its own boiler, it’s worth asking specifically who the heat network operator is, and confirming they’re operating under Ofgem’s new authorisation framework rather than assuming heat network status automatically means the same protections as a standard gas or electricity supply. This is a genuinely different commercial and regulatory relationship from owning your own boiler, which is the default assumption behind most of the rest of this site’s boiler-buying guidance.

FAQs

Do I have a choice of heat network supplier the way I can switch gas or electricity supplier?

Generally no — a heat network is typically tied to the building’s physical infrastructure, so unlike gas or electricity, you usually can’t switch to a different heat network provider while remaining in the same property.

Does a heat network mean I can’t have a Boiler Upgrade Scheme grant or a heat pump of my own?

If your property is served by a communal or district heat network, an individual heat pump for your home specifically usually isn’t relevant, since the heating decision is made at the building or network level rather than per household.

Were there any consumer protections for heat network customers before January 2026?

Some baseline requirements existed under the Heat Network (Metering and Billing) Regulations 2014, covering metering and billing specifically, but the fuller consumer protection framework comparable to gas and electricity customers is what began from January 2026 under Ofgem’s new regulatory role.

Sources

This guide draws on the following primary sources, current as of 18 September 2026:

• Ofgem: Heat networks regulation – consumer protection

Related guides

Best Boiler Deals is an independent guide. We may earn a fee from some links; this never affects what we write. This article is general information, not regulated advice on any specific installation — always confirm the details with a Gas Safe registered engineer.

If you’re building, or buying off-plan, a new home in Scotland, a standard gas boiler simply isn’t an option for the main heating system under current building standards — this is settled law, not a proposal still working through consultation.

What the New Build Heat Standard actually bans

The Scottish Government’s own factsheet confirms that under the New Build Heat Standard, fossil fuel gas and oil boilers cannot be used as a mains heating system in new-build homes and buildings. This is specifically about direct emission heating systems — systems that burn a fossil fuel on-site to produce heat — rather than a ban on heating in general, and it applies to new-build properties going through Scotland’s building standards system, not to existing homes with a boiler already installed.

When it actually took effect, and what changed in January 2025

The standard’s core prohibition first applied from 1 April 2024 for new building warrant applications. Following a government review, further changes to the regulations completed the Scottish Parliament process and came into force on 1 January 2025, refining some detail of the standard (including confirming that bioenergy heating systems, such as wood burners, and peat-burning systems remain permitted in all new homes and buildings) while keeping the core ban on gas and oil boilers as a mains heating system firmly in place.

What replaces the gas boiler in a new Scottish home

The Scottish Government’s factsheet confirms new buildings are expected to install climate-friendly heating alternatives instead — heat pump systems are the option most commonly specified, alongside heat networks and other renewable heating solutions, plus the permitted bioenergy and peat-burning systems mentioned above for specific circumstances. This sits within Scotland’s wider Heat in Buildings Strategy, reflecting that heating accounts for a substantial share of the country’s overall carbon emissions.

Why this doesn’t affect existing homes, at least not yet

It’s worth being precise about scope here, because this is a common point of confusion: there is currently no enacted Scottish law banning gas boilers in existing homes, on any date. If you already have a working gas boiler in an existing Scottish property, the New Build Heat Standard doesn’t require you to replace it, and doesn’t set any compulsory removal date for that boiler. The standard applies specifically to new building warrant applications for new-build properties, not retrospectively to housing stock that already exists.

What this means if you’re buying a new-build home in Scotland

If you’re purchasing an off-plan or newly built property in Scotland, it’s worth confirming directly with the developer what heating system has actually been installed, since it will be a heat pump, heat network, or one of the other permitted alternatives rather than a gas boiler — this affects running costs, servicing arrangements and the kind of maintenance contractor you’ll need going forward, compared with the gas boiler ownership experience most of this site otherwise covers.

FAQs

Does the New Build Heat Standard apply anywhere else in the UK?

No — this is a specific Scottish building standards requirement. England has separate plans and timescales for new-build heating under its own Future Homes Standard, covered elsewhere on this site, and the two shouldn’t be assumed to align exactly.

Can I still get a gas boiler serviced or replaced like-for-like in an existing Scottish home?

Yes — the standard doesn’t restrict existing homes, so servicing, repairing or replacing an existing gas boiler in an already-built property isn’t affected by this specific rule.

What counts as a “new build” under this standard?

It applies based on when a building warrant application is submitted for a new building, so a property already under construction with an earlier warrant may fall under different rules than one newly warranted after the relevant dates — checking the specific warrant date is the reliable way to confirm which rules apply to a given property.

Sources

This guide draws on the following primary sources, current as of 18 September 2026:

• gov.scot: New Build Heat Standard factsheet

Related guides

Best Boiler Deals is an independent guide. We may earn a fee from some links; this never affects what we write. This article is general information, not regulated advice on any specific installation — always confirm the details with a Gas Safe registered engineer.

If a boiler installer stops trading after taking a deposit or part-payment, what actually protects you depends on how you found them and how you paid — not on goodwill or hoping it works out.

The two protections that actually matter

There are two genuinely distinct forms of protection worth understanding before you pay a boiler installer anything upfront: financial protection required through a scheme like TrustMark, which is tied to how you found and engaged the installer, and Section 75 of the Consumer Credit Act 1974, which is tied to how you paid. They work independently of each other, and having neither in place leaves you relying on the general insolvency process, where an unsecured creditor (which is what an unpaid customer typically becomes) is often near the back of the queue for whatever money is left.

TrustMark’s financial protection requirement

TrustMark is the UK government-endorsed quality scheme covering work carried out in and around the home, and it’s a mandatory requirement for all TrustMark registered businesses that they provide customers with a minimum level of financial protection. TrustMark’s own guidance confirms this covers two specific things: prepayments, meaning deposits or other amounts paid in advance of work being carried out, and a minimum two years of protection for workmanship after completion. This means that if a TrustMark registered installer ceases trading after taking your deposit, or after completing work that then turns out to be defective, there’s a defined financial protection mechanism designed to step in, rather than you being left with nothing but a claim against a company that no longer exists. The specific mechanism can vary by business, since TrustMark vets multiple approved financial protection providers rather than running one central fund, so it’s worth asking which specific protection applies to your installer before you pay anything.

Section 75: your credit card as a backstop

Separately from any scheme membership, Section 75 of the Consumer Credit Act 1974 gives you a direct legal right against your credit card provider if a trader you’ve paid, in whole or in part, on a credit card breaches the contract, including by going out of business before finishing the work. The protection applies to purchases costing between £100 and £30,000, and the useful detail many people miss is that you don’t need to have paid the full amount on the card — even a deposit of a few pounds charged to a qualifying credit card can be enough to bring the full contract value within Section 75’s protection, provided the total cost of the job falls within that range. Under Section 75, the credit card provider is jointly and severally liable alongside the trader, meaning you can pursue a claim against the card provider directly rather than only against a company that may no longer be trading.

What neither protection covers

It’s worth being clear about the gaps. Section 75 specifically applies to credit cards, not debit cards, and not cash or bank transfer payments, so paying entirely by bank transfer to an installer with no scheme membership removes this particular safety net. TrustMark’s financial protection requirement only applies to TrustMark registered businesses, so an installer who isn’t registered with TrustMark, or a similar scheme with its own equivalent protection, isn’t bound by this requirement at all. An installer being Gas Safe registered, which is a legal requirement for gas work generally, doesn’t by itself guarantee either of these specific financial protections — Gas Safe registration is about competence to work safely on gas appliances, not about deposit protection if the business fails.

Reducing the risk before you pay a deposit

• Check whether your installer is TrustMark registered, and if so, ask specifically what financial protection mechanism applies to your job and what it would cover if the business stopped trading.
• Where practical, pay at least part of any deposit or stage payment on a qualifying credit card rather than entirely by bank transfer, so Section 75 protection is available as a backstop even if no scheme membership applies.
• Be cautious of a large upfront deposit relative to the total job value; staged payments tied to completed work reduce how much you’d stand to lose if an installer ceased trading partway through.
• Keep the paperwork — the contract, the deposit receipt, and confirmation of how you paid — since both a TrustMark claim and a Section 75 claim will ask for this evidence.

FAQs

What if I paid by debit card and the installer isn’t TrustMark registered?

This is the weakest position of the scenarios covered here. Debit card payments don’t carry Section 75 protection, though a chargeback claim through your bank may sometimes be possible depending on the circumstances; without scheme membership, you’d otherwise be relying on the general insolvency process as an unsecured creditor.

Does Section 75 cover the whole job if I only put a small deposit on my credit card?

Yes, in principle — provided the total cost of the job is between £100 and £30,000, even a small deposit charged to a qualifying credit card can bring the full contract value within Section 75 protection, not just the amount actually charged to the card.

Is TrustMark the only scheme offering this kind of protection?

No — other consumer protection or trade body schemes can offer broadly similar financial protection requirements for their members, but the specifics vary, so check what a particular scheme actually guarantees rather than assuming all memberships offer equivalent cover.

Sources

This guide draws on the following primary sources, current as of 17 September 2026:

• TrustMark: Providing financial protection for homeowners
• legislation.gov.uk: Consumer Credit Act 1974
• Which?: Section 75 of the Consumer Credit Act

Related guides

Best Boiler Deals is an independent guide. We may earn a fee from some links; this never affects what we write. This article is general information, not legal advice on any specific dispute — contact Citizens Advice or a solicitor if you’re dealing with an installer insolvency.

The Future Homes and Buildings Standards will require new homes in England to be built with low-carbon heating rather than a gas boiler — but the confirmed commencement date, set out in an official building circular, is 2027, not the 2025 date still widely reported.

What the standard actually requires

The Future Homes and Buildings Standards are changes to Part L (conservation of fuel and power) and Part F (ventilation) of the Building Regulations, aimed at ensuring new homes and other new buildings are built with low-carbon heating and high levels of energy efficiency from the outset, rather than needing retrofitting later as the electricity grid decarbonises. In practical terms for heating, the effect is that new dwellings built to the standard won’t be specified with a mains gas connection or a conventional gas boiler as the primary heat source; instead they’ll need a low-carbon system such as a heat pump or a connection to a heat network, alongside a requirement for a degree of on-site renewable electricity generation.

The actual commencement dates

An official building circular published by the department in early 2026 sets out the confirmed commencement position: the standards take effect from 24 March 2027 for most new dwellings, with a later date of 24 September 2027 specifically for higher-risk building work. A transitional arrangement protects projects that had already submitted a building control application before the relevant commencement date, provided construction on those projects actually starts by 24 March 2028. This means a project already in the building control pipeline ahead of the cut-off isn’t retrospectively forced to redesign its heating system, but a genuinely new application submitted after commencement is expected to comply from the outset.

Why you may have seen “2025” reported instead

Government messaging around the Future Homes Standard consultation, which ran between December 2023 and March 2024, referred to the standard coming into force “in 2025,” and a great deal of industry and consumer coverage published at the time repeated that date. Consultation timelines and the eventual commencement date of a Building Regulations change don’t always land on the same year, particularly for a technical change of this scale affecting the construction industry’s supply chains and building control processes. If you’re researching this topic and keep finding “2025” stated as fact, it’s worth checking the publication date of that source against the more recent, dated building circular confirming the actual 2027 commencement position.

What it doesn’t affect: your existing gas boiler

The Future Homes Standard is a requirement on new-build construction, specifically the heating systems specified in new dwellings going through building control from the relevant commencement date onward. It does not require existing homes with a working gas boiler to remove or replace it, and it doesn’t ban the sale, servicing or repair of gas boilers in existing properties. If you own an existing home and are simply replacing a failed or ageing gas boiler like-for-like, this standard has no direct bearing on that decision — it’s specifically a new-build regulation, not a retrofit mandate for existing housing stock.

What it means if you’re mid-project

• If you’re self-building or extending in a way that involves a new dwelling, check the date your building control application was or will be submitted against the confirmed commencement dates above.
• A building control application submitted before commencement, with construction starting before the 24 March 2028 transitional deadline, is generally treated under the previous rules rather than the new standard.
• Guidance covering heat pump installation, heat network connections and a new Home User Guide for occupiers is being updated alongside the standard, so a self-build project timed close to the commencement dates is worth discussing directly with a building control body.
• None of this affects an ordinary boiler replacement in an existing home, which continues to be governed by the existing Building Regulations requirements covered elsewhere on this site.

FAQs

Will I be forced to remove my gas boiler from my existing home?

No — the Future Homes Standard applies to new-build construction, not to existing homes with a working gas boiler. There is no requirement under this standard to remove or replace a gas boiler in an existing property.

Does this mean I can’t buy a new gas boiler after 2027?

The standard governs what can be specified in new-build dwellings from the commencement dates; it doesn’t ban the sale or installation of gas boilers in existing homes, which remain a normal replacement option outside new-build construction.

Is the commencement date definitely 2027, or could it change again?

The dates above come from an official building circular published in 2026, the most current confirmed position at the time of writing — but government timelines for major regulatory changes have shifted before, so it’s worth checking gov.uk directly for the latest position if your project timeline is close to these dates.

Sources

This guide draws on the following primary sources, current as of 17 September 2026:

• GOV.UK: The Future Homes and Buildings Standards – Building Circular 01/2026 (letter)

Related guides

Best Boiler Deals is an independent guide. We may earn a fee from some links; this never affects what we write. Building Regulations timelines are subject to government policy change — confirm the current position with a building control body before relying on any date given here.

The Boiler Upgrade Scheme is a genuine government grant reducing the upfront cost of low-carbon heating — but despite the name, it specifically funds heat pumps and biomass boilers, and it doesn’t put a penny towards an ordinary gas boiler.

What the scheme actually funds

The Boiler Upgrade Scheme (BUS), administered by Ofgem, provides upfront grants to help reduce the cost of installing heat pumps and biomass boilers in homes and non-domestic buildings in England and Wales. It’s aimed squarely at supporting the switch to low-carbon heating technology, covering air source and ground source heat pumps, water source heat pumps, air-to-air heat pumps for residential properties, and biomass boilers. An ordinary gas, oil or LPG boiler replacement doesn’t fall within its scope at all, regardless of how efficient the new unit is or how the installation is funded otherwise.

Grant amounts, and why they vary

Grant values differ by technology and, in some cases, by whether the property is on the gas grid. Ofgem’s guidance sets out £7,500 for air-to-water, ground source and water source heat pumps, £9,000 for air-to-water or ground source heat pumps specifically in off-gas-grid properties (until 31 March 2027), £5,000 for biomass boilers, and £2,500 for air-to-air heat pumps in residential properties. These figures and the scheme’s closing date are set by government policy and can change, so treat any figure here as a starting point for a conversation with an MCS-certified installer rather than a guaranteed amount for your specific property.

Why gas boilers are excluded

The scheme’s entire purpose is to reduce the cost gap between a low-carbon heating system and a conventional gas boiler, on the basis that heat pumps and biomass systems typically cost more to install than a like-for-like gas boiler replacement. Funding gas boiler installations through the same scheme would work against that specific policy aim, since it would remove the incentive the grant is designed to create. This is worth understanding before assuming “boiler” in the scheme’s name means any boiler — in this context it specifically means biomass boilers, a renewable heating technology, not the gas boiler most UK homes currently have.

How you actually access it

The scheme is installer-led rather than something a homeowner applies for directly. Installers who are MCS certified can apply for and redeem Boiler Upgrade Scheme vouchers on behalf of property owners, meaning the grant is built into the quote you receive from an MCS-certified installer rather than claimed back separately after the work is done. This also means the grant is only accessible through installers holding the relevant MCS certification — a heat pump installation from a non-MCS-certified installer, however competent the actual work might be, simply can’t access this particular funding route.

What this means if you’re comparing a boiler against a heat pump

• If you’re weighing up a heat pump against a straight like-for-like gas boiler replacement, the Boiler Upgrade Scheme grant is a genuine factor narrowing the upfront cost gap between the two — it’s worth getting a heat pump quote with the grant applied before ruling it out on cost alone.
• If you’ve already decided a gas boiler is the right fit for your property, this scheme simply isn’t relevant to your project, and separate schemes such as ECO4 or the Great British Insulation Scheme are the ones worth checking instead.
• Because the scheme is installer-led, confirming a heat pump installer’s current MCS certification status is a necessary first step before assuming the grant will apply to a quote.
• Grant amounts and eligibility rules are set by government policy and reviewed periodically, so check the current position with Ofgem or an MCS-certified installer rather than relying on a figure you saw some time ago.

FAQs

Can I get any government grant towards a straightforward gas boiler replacement?

The Boiler Upgrade Scheme specifically won’t fund one, but other schemes such as ECO4 or the Great British Insulation Scheme may be relevant depending on your circumstances and property — these operate under different eligibility rules to the Boiler Upgrade Scheme.

Does the grant get paid to me, or to the installer?

The installer applies for and redeems the voucher, and the grant value is reflected in the price you’re quoted, rather than being paid to the homeowner directly or claimed back after the work.

Is the Boiler Upgrade Scheme available in Scotland or Northern Ireland?

No — it currently operates in England and Wales only. Scotland and Northern Ireland have their own separate heating support schemes, which operate under different rules.

Sources

This guide draws on the following primary sources, current as of 17 September 2026:

• Ofgem: Boiler Upgrade Scheme (BUS)

Related guides

Best Boiler Deals is an independent guide. We may earn a fee from some links; this never affects what we write.

A boiler interlock is a wiring and control arrangement that stops your boiler firing when there’s no actual demand for heat — and it’s a Building Regulations requirement, not an optional upgrade your installer is trying to sell you.

What a boiler interlock actually is

A boiler interlock is an electrical wiring arrangement between a boiler’s controls, room thermostat(s), and any cylinder thermostat, designed so that the boiler and pump only run when at least one of the controls is calling for heat. Without an interlock, a boiler can continue firing and circulating hot water even after a room or cylinder has reached its target temperature, wasting gas by heating a space or a hot water store that doesn’t currently need it. The interlock is what ties the boiler’s operation directly to actual demand, rather than leaving it to run on a simple timer regardless of whether any room or cylinder is calling for heat.

Where the requirement comes from

The requirement sits within Approved Document L, Volume 1 (Conservation of fuel and power for dwellings), the technical guidance supporting Part L of the Building Regulations in England. Where a gas or oil boiler is fitted or replaced, the installer is required to fit a boiler interlock along with time and temperature controls, if these aren’t already in place. This isn’t a discretionary best-practice suggestion sitting alongside the regulations — it’s presented as part of what a compliant installation looks like, and a Gas Safe registered installer notifying the work through the Competent Person Scheme route is expected to be delivering an installation that meets it.

How it’s usually achieved in practice

In a typical domestic system, the interlock is achieved through a combination of a room thermostat, thermostatic radiator valves (TRVs) on individual radiators, and, where there’s a hot water cylinder, a cylinder thermostat, all wired back through the boiler’s control circuit so that the boiler only fires when one of these is calling for heat. There’s more than one acceptable wiring configuration, and the specific approach an installer uses can depend on the existing system and the boiler manufacturer’s own control requirements, but the underlying principle, demand-linked operation rather than continuous running, stays the same across approaches.

Why it matters beyond compliance

Setting the regulatory requirement aside, a properly wired interlock has a direct, practical effect on running costs: a boiler that keeps firing and circulating hot water to rooms that have already reached temperature, or to a cylinder that’s already hot, is burning gas for no useful purpose. This is one of the less visible reasons two homes with seemingly similar boilers and similar usage patterns can see meaningfully different gas bills — an older system without a proper interlock, or one where TRVs have been left permanently wide open, can run the boiler far more than a correctly interlocked, correctly set-up system actually needs to.

What this means if you’re replacing a boiler

• If your existing system doesn’t already have a boiler interlock in place, your installer is required to add one as part of a boiler replacement, not offer it as an optional extra.
• This may mean new wiring, a new or repositioned room thermostat, or TRVs fitted to radiators that don’t currently have them, and it’s worth asking your installer to confirm what’s being added as part of the quoted price.
• For a gas combi boiler specifically, Boiler Plus also requires at least one further energy-saving measure on top of the interlock, such as weather compensation, load compensation, flue gas heat recovery, or a smart thermostat with automation features — ask which one is being proposed for your installation.
• Scotland, Wales and Northern Ireland have their own building standards, so if you’re outside England, check the equivalent requirement that applies to your installation rather than assuming Approved Document L applies directly.

FAQs

Do I need to ask for a boiler interlock, or does the installer just include it?

A Gas Safe registered installer working in England is required to fit one as part of a compliant boiler replacement where it isn’t already present, so you shouldn’t need to specifically request it — but it’s reasonable to ask them to confirm it’s included, particularly if your existing system is older.

Does a boiler interlock mean I need a smart thermostat?

Not necessarily — a standard room thermostat combined with TRVs and, where relevant, a cylinder thermostat can satisfy the interlock requirement. A smart thermostat is one of the accepted options for the separate additional measure required on gas combi installations under Boiler Plus, not a universal requirement on its own.

Can an old boiler installation legally lack an interlock?

The requirement applies at the point a boiler is fitted or replaced under current regulations; an older installation that predates the current requirement may not have one, but any boiler replacement carried out now should bring the system up to the current standard.

Sources

This guide draws on the following primary sources, current as of 17 September 2026:

• Approved Document L, Volume 1 (England, 2021 edition incorporating 2023 amendments)
• GOV.UK: Boiler Plus final policy (BEIS, 2017)

Related guides

Best Boiler Deals is an independent guide. We may earn a fee from some links; this never affects what we write. This article describes a Building Regulations requirement in general terms; confirm current requirements with a Gas Safe registered installer before committing to any installation.

It’s a common assumption that anything described as “energy-saving” qualifies for reduced VAT. For an ordinary gas boiler replacement, that assumption is usually wrong — standard 20% VAT normally applies.

Why a gas boiler is standard-rated

HMRC’s VAT notice on energy-saving materials and heating equipment is explicit that ordinary gas-fired boilers do not qualify for the 0% or reduced-rate relief available to energy-saving materials. The guidance states that the installation of “other energy-efficient products, such as energy-efficient boilers… are standard-rated,” meaning the normal 20% VAT rate applies to both the boiler unit and its installation, in the same way as most other home improvement work. This surprises some homeowners who assume that because a new condensing boiler is more efficient than the one it’s replacing, it should automatically attract the same relief as insulation or a heat pump. It doesn’t.

What actually gets the zero rate

The relief that does exist is genuinely generous, but it’s aimed at a specific list of technologies, not heating equipment generally. From May 2023 to March 2027, installing the following qualifies for the 0% VAT rate: ground, air and water source heat pumps; wall, floor, ceiling, roof and pipe insulation; solar panels and photovoltaic systems; wind and water turbines; wood-fuelled boilers; associated heating system controls; draught stripping; electrical battery storage; and smart diverters. A wood-fuelled boiler is on that list; a standard gas or oil boiler is not. This is the dividing line worth understanding before assuming a quote should reflect a reduced rate.

The grant-funded exception that does cover gas boilers

There is one specific circumstance where a gas boiler installation can attract a reduced 5% VAT rate rather than the standard 20%: where the installation is grant-funded under a qualifying scheme for a qualifying person, generally someone aged 60 or over, or someone receiving certain benefits. This exception exists because it sits under a different part of VAT law aimed at supporting vulnerable households with essential heating, rather than under the energy-saving materials relief aimed at decarbonisation technology. If you think you might qualify, ask your installer directly whether the specific grant scheme they’re proposing falls under this reduced-rate provision, since not every grant-funded installation automatically does.

Why the confusion happens

Much of the public confusion traces back to genuine, sweeping VAT changes to home energy efficiency measures announced in 2022 and taking effect from April 2023, which extended the zero rate to a wider list of technologies and removed some of the previous restrictions and caps. Heat pumps, solar panels and insulation were the headline beneficiaries of that change, and general reporting on “the VAT cut for green home upgrades” didn’t always make clear that a conventional gas boiler sat outside the change. If you’ve seen coverage suggesting boiler VAT has been cut, it’s worth checking whether that coverage was actually describing heat pumps or other qualifying technology rather than gas boilers specifically.

What to check on a quote

• For a standard gas, oil or LPG boiler replacement, expect 20% VAT on both parts and labour, and treat a quote showing a lower rate as something to query rather than accept at face value.
• If you’re being quoted for a heat pump, wood-fuelled boiler, solar thermal system or associated controls, 0% VAT should generally apply — if a quote shows 20% for one of these, ask the installer to explain why.
• If your installation is being funded through a specific grant scheme aimed at older or benefits-receiving households, ask explicitly whether the 5% reduced rate applies to your circumstances rather than assuming either the standard or reduced rate by default.
• VAT rules and the qualifying technology list can change; treat a quote’s stated VAT rate as something to double-check against current HMRC guidance rather than something fixed indefinitely.

FAQs

Does a highly efficient condensing boiler get any VAT relief for being efficient?

No — efficiency alone doesn’t determine VAT treatment. The relief is tied to the specific list of qualifying technologies (heat pumps, solar, wood-fuelled boilers and similar), not to how efficient a conventional gas boiler happens to be.

What about VAT on boiler servicing or repairs, rather than a full replacement?

Routine servicing and repair work on an existing boiler is standard-rated in the same way as a new installation; the energy-saving materials relief is specifically about installing qualifying technology, not maintaining existing equipment.

Can I claim back VAT on a new boiler myself?

For a domestic, non-business installation, VAT is charged by the installer as part of the normal price and isn’t something a private homeowner reclaims separately — the relief operates by changing the rate the installer charges at the point of sale, not through a later claim.

Sources

This guide draws on the following primary sources, current as of 17 September 2026:

• GOV.UK: VAT on energy-saving materials and heating equipment (Notice 708/6)

Related guides

Best Boiler Deals is an independent guide. We may earn a fee from some links; this never affects what we write. This article is general information, not tax advice on any specific installation — confirm current VAT treatment with your installer or HMRC.