New boiler installation across London by Gas Safe registered engineers. Post a job free and receive quotes within hours.
New combi boiler supply and fit. Ideal for London flats and smaller houses. No cylinder required — hot water on demand.
Get quotes →System boiler with hot water cylinder. Best for larger London homes with multiple bathrooms and high hot water demand.
Get quotes →Traditional heat-only boiler with cylinder and feed tank. Suited to older London properties with gravity-fed systems.
Get quotes →Moving a boiler to a different location — kitchen to utility room, loft, or outside flue. Full Gas Safe certification included.
Get quotes →New flue routes for boiler relocations or where existing flue is non-compliant. All flue work carried out to current regulations.
Get quotes →Smart thermostat installation — Nest, Hive, or Tado — alongside new boiler for remote control and energy saving.
Get quotes →| Job | Low estimate | High estimate |
|---|---|---|
| New combi boiler (supply + fit) | £1,800 | £3,500 |
| System boiler (supply + fit) | £2,000 | £4,500 |
| Heat-only boiler | £1,500 | £3,000 |
| Boiler relocation | £500 | £1,500 |
| Magnetic filter (Magnaclean) | £150 | £250 |
| Smart thermostat (Nest/Hive) | £200 | £350 |
Prices are estimates for London 2026. Costs vary by boiler brand, model, and installation complexity. Always get at least three quotes.
Describe the boiler installation needed — combi, system, or heat-only — and your London postcode. Under 2 minutes.
Gas Safe registered engineers covering your area respond with quotes. They may ask to survey the property first for complex jobs.
Review each engineer's Gas Safe number, brand experience, warranty terms, and price. No obligation.
The choice between a combi boiler and a system boiler is particularly important in London, where property sizes and household configurations vary enormously. For the capital's many studio and one-bedroom flats, a compact combi boiler is almost always the right choice — modern units are efficient, reliable, and take up very little space. For London's larger Victorian and Edwardian family homes — particularly those with 3 or more bathrooms — a system boiler with a well-insulated hot water cylinder is generally more suitable, as it can supply multiple hot water outlets simultaneously without the flow-rate limitations of a combi. Worcester Bosch and Vaillant are the most commonly installed brands across London, with Viessmann popular at the premium end.
London's very hard water supply makes scale protection a critical consideration for any new boiler installation. Manufacturers including Worcester Bosch and Vaillant require a scale inhibitor to be fitted to maintain warranty validity in hard water areas. A magnetic boiler filter (such as a Magnaclean or equivalent) should always be installed on the heating return pipe to capture iron oxide sludge that would otherwise circulate through the new boiler. Both of these additions are modest in cost but can extend boiler life significantly and protect the manufacturer warranty — always confirm they are included in your installation quote.
Free to post. No subscription. Gas Safe registered engineers across all London boroughs — usually responding within hours.