Quick answer: in the UK a Gas Safe registered engineer must fit and service gas boilers, a like-for-like combi swap typically costs £1,800–£3,500, and most grants now fund heat pumps and insulation rather than gas boilers. What help you can get depends on where you live, so our local guides set out the schemes, rules and gas networks city by city.
Boiler rules are mostly national, but the help on offer is not. England’s Warm Homes: Local Grant is run by councils and combined authorities with their own eligibility and priority areas, Scotland has its own grants and alarm law, and some cities have council schemes of their own. Smoke control rules, which matter for solid-fuel and back boilers, are set locally too.
Our local guides are built from the pages councils, grant schemes and gas networks publish, read in September 2026, with national price ranges alongside so you can judge a quote.
Local guides
- Boiler costs in the UK (2026): new boilers, servicing and extras
- Boilers in London: grants, local rules and heating engineers
- Boilers in Birmingham: grants, local rules and heating engineers
- Boilers in Manchester: grants, local rules and heating engineers
- Boilers in Glasgow: grants, local rules and heating engineers
- Boilers in Leeds: grants, local rules and heating engineers
Comparing UK options
If you already know what you need, our boiler options comparison sets out the choices, and you can ask for a boiler quote with one short form.
Best Boiler Deals is a comparison and referral service, not a heating engineer. We do not install or repair boilers, and a listing here is not a recommendation.