The Climate Change Committee has published a stark number: the average UK household could save up to £1,000 a year on energy bills by 2040 if the country electrifies heating and transport at pace. That is not a distant promise, it is a direct challenge to the government’s current trajectory, which the CCC says is too slow.
As reported by the Climate Change Committee, faster electrification would mean swapping gas boilers for heat pumps and petrol cars for electric vehicles. The savings are not hypothetical, they come from the fact that heat pumps are three to four times more efficient than gas boilers, and EVs cost roughly half as much per mile to run as a petrol car.
What it costs a typical 3-bed semi
Take a semi-detached house in Manchester, built in the 1990s, with a gas boiler and a petrol car. Its annual energy bill runs around £1,800 for gas and electricity, plus £1,500 in fuel for 8,000 miles of driving. Switch to a heat pump and an EV, and the combined cost drops to roughly £2,000, a saving of £1,300. The CCC puts the average saving at £700–£1,000, depending on house type and driving habits.
But the upfront cost remains the elephant in the room. A heat pump installation runs £7,000–£13,000, and an EV costs £30,000+ new. The Boiler Upgrade Grant covers £7,500 of the heat pump cost, and second-hand EVs are now entering the market at £15,000–£20,000. The CCC says these upfront costs will fall as scale increases, but for now they deter many households.
Who qualifies, and who doesn’t
The Boiler Upgrade Grant is available to all homeowners in England and Wales who replace a fossil fuel heating system with an air-source or ground-source heat pump. It does not require a minimum EPC rating, but the property must have adequate insulation, the grant covers the heat pump, not the loft lagging. The Energy Company Obligation (ECO4) scheme offers free insulation for low-income households, which can reduce heat loss by 30–50% and make a heat pump viable.
For renters, the picture is bleaker. Landlords are not required to install heat pumps, and the minimum EPC rating of C by 2028 for new tenancies does not mandate a specific technology. The CCC has called for a mandate on heat pump installation from 2030, but the government has not yet committed to that date.
The catch: electricity pricing
Yet here is the contradiction: electricity costs about 28p per kWh, while gas costs 7p. That four-to-one ratio makes running a heat pump more expensive than a gas boiler in some poorly insulated homes. The CCC, alongside Ofgem, has argued for moving environmental levies from electricity bills to general taxation, a shift that would cut the electricity price by roughly 15%, or £150 a year for a typical household. The government has not acted on this recommendation.
What this misses is the wider system cost. Delaying electrification means the UK keeps burning gas for heating and petrol for transport, locking in volatile prices and missing net-zero targets. The CCC estimates that every year of delay adds £2bn to national energy costs. For the homeowner, that translates into a longer wait for cheaper bills.
How to act now
Households on standard variable tariffs can check their eligibility for the Boiler Upgrade Grant through the Ofgem website. The grant is first-come, first-served until March 2027. For those not ready to replace their boiler, the first step is insulation: cavity wall and loft insulation cost £500–£2,000 and cut heating demand by 20–40%, making any future heat pump more cost-effective. The Energy Saving Trust provides free advice for each property type.
Finally, consider switching to a time-of-use tariff like Economy 7 or Octopus Agile, which can reduce electricity costs for heat pumps and EV charging by up to 30%. The CCC’s message is clear: faster electrification saves money, but only if you start planning now.
Frequently Asked Questions
Yes, but only if your home is well insulated. A heat pump uses 3–4 times less energy to produce the same heat, so even with higher electricity prices, it typically cuts heating bills by 20–40% for a typical 3-bed semi with good insulation. The £7,500 Boiler Upgrade Grant reduces the upfront cost.
There is no legal requirement to replace your gas boiler yet, but the government's 2035 target for all new heating systems to be low-carbon means that after that date, you may not be able to install a new gas boiler. The CCC recommends acting earlier to lock in lower running costs and avoid a last-minute rush.
