Heat batteries and the £2,500 grant
Last checked 30 September 2026. Grant rates and deadlines change — confirm on GOV.UK before acting.
Not claimable yet. The £2,500 heat battery grant has been announced as part of the Boiler Upgrade Scheme, but at the time of checking Ofgem did not yet list heat batteries as a technology you can claim for. If an installer quotes you this grant, ask for written confirmation that claims are open before you sign.
What a heat battery is
A unit that stores heat, typically using a phase change material, and releases it for hot water on demand. It takes roughly the space of a large kitchen appliance rather than a hot water cylinder, and it can be charged when electricity is cheapest.
Why it was added to the scheme
It fits homes that heat pumps struggle with — flats and small properties with no room for a cylinder — and it works well with off-peak tariffs, which is where the running cost saving comes from.
Be careful with the claims. This is a newer product category and the marketing runs ahead of the independent evidence. Savings depend heavily on being on a time-of-use tariff and on your hot water habits. Treat any headline saving figure, including ones from manufacturers, as an estimate rather than a promise, and ask an installer to model it against your own usage.
Who it suits
Households on a smart or off-peak tariff, in properties without space for a cylinder, or where hot water rather than space heating is the main cost.