Gas boilers burn natural gas to heat water, which is then circulated through radiators or underfloor heating to warm the home. There are three main types of gas boilers.
Combi boilers provide heating and hot water on demand without the need for a water tank, making them suitable for smaller homes. System boilers require a hot water cylinder to store heated water. Conventional (or regular) boilers use both a hot water cylinder and a cold water tank, making them a better fit for larger homes with high water usage or older heating systems.
As natural gas is a fossil fuel, gas boilers are not compatible with net zero.
| Property size | Upfront cost | Running cost |
|---|---|---|
| Small | £2,500 | £405 |
| Medium | £3,000 | £850 |
| Large | £4,000 | £1,360 |
