New boiler cost by type
Typical supplied-and-fitted cost for a standard replacement.
| Boiler type | Best for | Typical fitted cost |
|---|---|---|
| Combi boiler | Smaller homes, one bathroom, no tank | £2,000 to £3,500 |
| System boiler | Larger homes with a hot water cylinder | £2,500 to £4,000 |
| Conventional (regular) boiler | Older homes with tanks in the loft | £2,500 to £4,500 |
| Full swap to combi | Removing tanks and reconfiguring pipework | £3,500 to £5,500 |
What makes up the cost
The boiler itself is often less than half the total.
| Element | Typical cost | Notes |
|---|---|---|
| Boiler unit | £700 to £2,500 | Varies by brand, output and warranty |
| Installation labour | £600 to £1,500 | One to three days depending on complexity |
| Flue and fittings | £100 to £400 | Longer or repositioned flues cost more |
| Controls and thermostat | £100 to £400 | Smart controls add convenience and efficiency |
| Power flush (if needed) | £300 to £700 | Cleans the system to protect the new boiler |
| Pipework changes | £200 to £1,500 | Relocating or converting boiler type |
What affects the price
Why two boiler quotes for the same house can differ by thousands:
- Boiler type and brand, premium boilers carry longer warranties and higher prices.
- Changing type, for example moving from a conventional system to a combi.
- Moving the boiler to a new location, which means new pipework and flue.
- Whether a power flush or system upgrade is needed to protect the new unit.
- Adding or upgrading controls such as smart thermostats and zoning.
- Access and property size, which affect labour time.
How to save on a boiler replacement
Sensible ways to reduce the cost:
- Match the boiler output to your home rather than over-specifying.
- Get three quotes from Gas Safe registered engineers and compare like for like.
- Keep the boiler in the same position to avoid rerouting pipes and flue.
- Check for manufacturer or energy-efficiency schemes you may qualify for.
- Service the new boiler annually to protect the warranty and avoid early failure.
Price the boiler before you buy
Our refurbishment planner includes a boiler replacement line so you can add it to your renovation budget and reserve, alongside radiators, rewiring and other systems, before you commit to an older property.
Only use a Gas Safe registered engineer
It is illegal and dangerous to have gas work done by anyone not on the Gas Safe Register. Always check the engineer's ID card and registration before work starts, and keep the paperwork for warranty and safety records.