The UK has installed roughly 200,000 heat pumps. Sweden has installed 2.5 million. That gap is not about climate, Sweden’s winters are colder. It is about policy, building stock, and installer culture.
As reported by The Conversation, Sweden’s success rests on a carbon tax introduced in 1991, which made oil heating unaffordable overnight. British governments instead tinkered with grants and VAT cuts, never creating the price signal that drives mass adoption.
Who qualifies, and who doesn’t
The Boiler Upgrade Scheme offers £7,500 towards an air-source heat pump, but only for homes in England and Wales. Scotland runs its own scheme, with similar sums. The catch: you need a well-insulated property with an EPC rating of C or above to get the full efficiency benefit. Ofgem figures show 60% of UK homes are rated D or lower.
Sweden avoided this problem by mandating minimum insulation standards in the 1970s. A typical Swedish home uses 100 kWh per m² per year for heating. The UK average is 240 kWh. That doubling of energy demand means UK heat pumps run longer, cost more to operate, and need larger radiators or underfloor heating.
What it costs a typical 3-bed semi
Installing an air-source heat pump in a 1970s semi-detached house typically costs between £7,000 and £13,000 after the grant. Running costs depend on the electricity-to-gas price ratio. At current prices, roughly 24p per kWh for electricity, 6p for gas, a heat pump is 10-20% cheaper to run than a gas boiler if the home is well insulated. If it is not, the heat pump costs more.
The Energy Saving Trust estimates a typical 3-bed semi uses 12,000 kWh of gas per year for heating. Switch to a heat pump with a coefficient of performance of 3.5, and you use 3,428 kWh of electricity. At 24p/kWh, that is £822, versus £720 for gas. A 14% saving, but only if the house holds heat.
What this misses
The comparison ignores two realities. First, Sweden’s electricity is cheap, around 12p/kWh in 2024, because of hydro and nuclear. The UK’s grid mix pushes prices higher. Second, Swedish installers are trained to design whole-house systems, not swap boilers. The UK has roughly 4,000 certified heat pump installers versus 120,000 gas boiler fitters. That bottleneck adds £1,000–£2,000 to installation costs.
But the direction is clear. The UK will ban new gas boiler installations in homes from 2035. The Future Homes Standard, effective 2025, mandates heat pumps or district heating in all new builds. For existing homes, the government’s Heat and Buildings Strategy commits £3.9 billion to decarbonise heating by 2028.
What to do and by when
Homeowners considering a heat pump should first improve insulation. Loft insulation to 270mm costs £300–£600 and saves £200 a year. Cavity wall insulation costs £500–£1,500 and saves £250. Only then apply for the Boiler Upgrade Scheme through the MCS-certified installer. Applications open now, but grants are capped at 50,000 per year and often run out by August.
For those on standard variable tariffs, switching to a heat pump-specific time-of-use tariff, like Octopus Cosy or OVO Heat Pump Plus, can cut running costs by another 15%. The combination of insulation, grant, and smart tariff brings UK heat pump costs within touching distance of Sweden’s model. The gap is real, but not insurmountable.
Frequently Asked Questions
Yes, the Boiler Upgrade Scheme does not require a minimum EPC rating. However, without adequate insulation, your heat pump will run less efficiently and may cost more to operate than a gas boiler. The Energy Saving Trust recommends upgrading insulation first.
Sweden's electricity is cheaper (around 12p/kWh versus the UK's 24p) due to hydro and nuclear generation. Also, Swedish homes are better insulated, meaning heat pumps use less energy to maintain comfortable temperatures.
