What the rules actually say about your boiler
The Boiler Upgrade Scheme describes the heating it replaces by fuel, not by age. The installer guidance lists the systems that count: fossil fuel heating, such as gas, oil, LPG or coal, or electric heating that does not include a heat pump. That is the whole test on the boiler side.
So the scheme does not ask:
- how old the boiler is;
- whether it is condensing or non-condensing;
- whether it is a combi, a system boiler or a regular boiler with a tank;
- whether it still works, or how well;
- whether it has been serviced, or when it was last replaced.
Why people think there is an age rule
Because another scheme has one. ECO4, the energy supplier scheme for households on certain benefits, can only upgrade a boiler if the law treats it as inefficient, and the law defines that as a system with a non-condensing boiler. A working condensing boiler is almost never replaced under ECO4, and a broken one only within a cap.
That rule has been repeated so often that it has attached itself to every heating grant in people’s minds. It does not apply here.
| Boiler Upgrade Scheme | ECO4 | |
|---|---|---|
| What it replaces the boiler with | A heat pump (or, rarely, a biomass boiler) | Usually a new gas boiler, or first-time central heating |
| Boiler age | Not asked | Must be non-condensing, or broken beyond economic repair |
| Condensing boiler | Qualifies | Only if broken, within a cap |
| Working boiler | Qualifies | Only if non-condensing |
| Benefits or income test | None | Yes: qualifying benefits, or council Flex |
| Who it is for | Owners of homes in England and Wales, including landlords | Lower-income households, until the scheme ends on 31 December 2026 |
If you want a gas boiler replaced with another gas boiler, the Boiler Upgrade Scheme has nothing for you, whatever its age. Our guide to non-condensing boiler replacement covers the ECO4 route.
Condensing boilers, combis and system boilers
All three are the same thing to the scheme: a fossil fuel heating system to be replaced. The type only matters for the practical design, and it matters in one way in particular.
A combi boiler heats water on demand and has no cylinder. A heat pump almost always needs a hot water cylinder, so the installer has to find the space for one: an airing cupboard, a loft, a utility room or a corner of a bedroom. For a system or regular boiler there is usually a cylinder already, which may or may not be suitable for a heat pump.
Our guide to a heat pump grant with a gas boiler goes through what changes when gas heating is replaced.
A working boiler is an advantage, not a problem
People sometimes feel they are “wasting” a boiler that still works. Looked at from the scheme’s side, a working boiler is the best position to apply from, for three reasons.
- You choose the timing. A survey, two or three quotes, Ofgem’s consent email and the installation take weeks. With a working boiler that is comfortable; with a dead one in January it is not.
- The design gets done properly. The heat-loss survey, the radiator checks and the cylinder plan all benefit from not being rushed.
- Nothing is lost by waiting for a good installer. A working boiler means you can turn down a quote you do not like and wait for a better one.
Do not wait for a breakdown
A boiler that fails in a cold spell tends to be replaced with the fastest thing available, which is another gas boiler. That boiler is still eligible for the scheme later, but the money has been spent twice. If a heat pump is on your mind, have the survey while the boiler is still running.
The one boiler rule that does exist
The existing boiler has to go. Ofgem’s guidance requires the existing fossil fuel system to be fully replaced, and GOV.UK says the grant cannot be used for a hybrid system such as a gas boiler combined with an air source heat pump. Keeping the boiler as a backup, however new it is, rules the installation out of the grant.
Three other things the scheme does not ask for
- Benefits or income. There is no income test. Our guide to the heat pump grant without benefits explains.
- An EPC. Since 28 April 2026 a valid EPC is no longer a standing requirement. Where one exists its number is used as evidence; where it does not, the installer provides other evidence.
- Insulation first. The earlier rule that an EPC must have no outstanding loft or cavity wall insulation recommendations was removed on 8 May 2024. Insulation is still worth doing, because a home that loses less heat needs a smaller heat pump, but it is not a condition of the grant.
Our guide to Boiler Upgrade Scheme myths goes through the rest.
What to do next
If your boiler works and you are thinking about a heat pump
- Answer the three checks: the property is in England and Wales, you own it, and it is heated by gas, oil, LPG or electric heating.
- Ask an MCS-certified installer for a heat-loss survey while the boiler is still running.
- Compare quotes that show the £7,500 grant deducted, and agree who applies and when.
Our step-by-step guide to getting an air source heat pump through the scheme covers every stage.
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