The Real Cost of Running a Heat Pump in 2026
At 2026 Ofgem price cap rates (electricity 24.5p/kWh, gas 7.4p/kWh), a typical UK household running an air source heat pump at a seasonal COP of 3.0 spends approximately £840–£980 per year on heating — compared to £980–£1,233 for a gas boiler at 90% efficiency. On a smart time-of-use electricity tariff, heat pump running costs fall further still, to £400–£750 per year depending on home size. Adding solar panels can cut costs by a further 50–70% (Energy Saving Trust).
The exact cost depends on your home’s heat demand, the heat pump’s efficiency, and what electricity tariff you are on. This guide breaks down every variable with real numbers.
Related reading: Air source heat pump vs gas boiler: running costs compared | Solar panels and heat pumps: the perfect combination
How Heat Pump Running Costs Work
A heat pump does not burn fuel. Instead, it uses electricity to move heat from the outside air into your home. For every 1 kWh of electricity a heat pump consumes, it delivers between 2.5 and 4 kWh of heat. This ratio is called the Coefficient of Performance (COP).
A COP of 3.0 means your heat pump is 300% efficient. Compare that with a gas boiler, which is typically 85–92% efficient. This is why heat pumps cost less to run despite electricity being more expensive per unit than gas.
The maths
Here is a simple example for a typical three-bedroom semi-detached house:
| Factor | Gas Boiler | Air Source Heat Pump |
|---|---|---|
| Annual heat demand | 12,000 kWh | 12,000 kWh |
| Efficiency | 90% | COP 3.0 (300%) |
| Fuel needed | 13,333 kWh gas | 4,000 kWh electricity |
| Unit price (Ofgem Q2 2026) | 7.4p/kWh (gas) | 24.5p/kWh (electricity) |
| Annual running cost | £987 | £980 |
| Gas standing charge | ~£117/year | eliminated |
| Total annual cost | ~£1,104 | ~£980 |
Even at standard tariff prices, the heat pump saves approximately £124 per year in this example (Energy Saving Trust). The real savings grow with smart tariffs, solar panels, and better insulation.
Heat Pump vs Gas Boiler Running Costs — Real Comparison
Current UK energy prices (Ofgem, April 2026 price cap)
| Fuel | Unit Price | Standing Charge |
|---|---|---|
| Gas | 7.4p/kWh | 31.4p/day (£114/yr) |
| Electricity | 24.5p/kWh | 61.6p/day (£225/yr) |
Annual running cost by house size
| House Type | Heat Demand | Gas Boiler (90%) | Heat Pump (COP 3.0) | Saving |
|---|---|---|---|---|
| 2-bed flat | 8,000 kWh | £659 | £653 | £6/yr |
| 3-bed semi | 12,000 kWh | £987 | £980 | £7/yr |
| 3-bed detached | 15,000 kWh | £1,233 | £1,225 | £8/yr |
| 4-bed detached | 20,000 kWh | £1,644 | £1,633 | £11/yr |
These figures cover heating only at standard tariff rates. Add in the eliminated gas standing charge (£117/year) and the overall saving is considerably larger.
With smart electricity tariff (off-peak average ~15p/kWh)
Many energy suppliers offer time-of-use tariffs where electricity costs as little as 7–12p per kWh during off-peak hours (typically 1am–5am). Heat pumps are ideal for these tariffs because you can pre-heat your home and hot water overnight.
| House Type | Gas Boiler | HP (standard tariff) | HP (smart tariff ~15p avg) | Saving vs Gas |
|---|---|---|---|---|
| 2-bed flat | £659 | £653 | £400 | £259/yr |
| 3-bed semi | £987 | £980 | £600 | £387/yr |
| 3-bed detached | £1,233 | £1,225 | £750 | £483/yr |
| 4-bed detached | £1,644 | £1,633 | £1,000 | £644/yr |
With solar panels (free daytime electricity)
If you have solar panels generating 3,000–4,000 kWh per year, a significant proportion of your heat pump’s electricity comes for free. With a battery, you can store solar energy for evening and morning heating.
| House Type | Gas Boiler | HP + Solar Panels | Saving vs Gas |
|---|---|---|---|
| 3-bed semi | £987 | £400–600 | £387–587/yr |
| 4-bed detached | £1,644 | £500–800 | £844–1,144/yr |
This is where the real transformation happens. A heat pump combined with solar panels can cut your heating costs by 50–70% compared to gas (Energy Saving Trust).
What Affects Heat Pump Running Costs?
1. Your home’s insulation
Insulation is the single biggest factor. A well-insulated home needs less heat, so your heat pump runs less. Before installing a heat pump, consider: - Loft insulation (270mm minimum) - Cavity wall insulation - Double or triple glazing - Draught-proofing
A poorly insulated Victorian terrace might need 20,000+ kWh of heat per year. A well-insulated modern home might need only 6,000 kWh.
Related reading: Is your home suitable for a heat pump?
2. The heat pump’s COP/SCOP
COP varies throughout the year. In summer, when outdoor temperatures are higher, your heat pump might achieve a COP of 4.5. In January, when it is 2 degrees outside, it might drop to 2.5. The Seasonal COP (SCOP) averages this out over the year.
| COP | What It Means | Typical Running Cost (12,000 kWh demand) |
|---|---|---|
| 2.5 | Below average | £1,176/yr |
| 3.0 | Good (typical UK) | £980/yr |
| 3.5 | Very good | £840/yr |
| 4.0 | Excellent | £735/yr |
3. Your flow temperature
Heat pumps are most efficient at lower flow temperatures (35–45 degrees C). If your radiators are correctly sized or you have underfloor heating, your heat pump runs at lower temperatures and achieves higher COP.
This is why a proper heat loss survey matters. At Electromatic M&E Ltd, our surveyor designs your system to run at the lowest possible flow temperature while keeping every room comfortable.
Related reading: Heat pump radiators: do you need to upgrade?
4. Your electricity tariff
Standard tariff: ~24.5p/kWh (Ofgem Q2 2026). Smart tariff (off-peak): 7–12p/kWh. Solar self-generation: 0p/kWh.
Switching to a time-of-use electricity tariff can transform your running costs without changing anything about the heat pump itself.
5. Hot water
Heat pumps heat your domestic hot water too, stored in a cylinder (typically 180–300 litres). Hot water accounts for roughly 20–30% of your total heat pump electricity use. A well-insulated cylinder and smart scheduling minimise this cost.
Related reading: Hot water with a heat pump: everything you need to know
Will Heat Pump Running Costs Get Cheaper?
Yes, almost certainly. Here is why:
Gas prices are rising: The UK’s dependence on imported gas means prices are volatile and trending upward. The government’s Clean Heat Market Mechanism adds further cost pressure to gas heating.
Electricity prices are falling (relatively): As more renewable energy comes online (offshore wind, solar farms), wholesale electricity prices are expected to decrease. The government has also signalled it may shift green levies from electricity to gas bills, which would make heat pumps even cheaper to run.
Technology is improving: Each generation of heat pumps is more efficient. The best units on the market already achieve seasonal COPs above 4.0.
Time-of-use tariffs are spreading: More suppliers are offering cheap off-peak rates specifically designed for heat pump owners.
How Electromatic Can Help
Electromatic M&E Ltd offers free home surveys across London and Surrey (TW, KT, SW postcodes). We handle BUS Grant applications (subject to eligibility), install ASHP and solar PV from a single contractor, and deliver within 2–4 weeks of survey confirmation. All work is carried out under MCS certification via our accredited umbrella partner. We will calculate your home’s exact heat demand and show you projected running costs before you commit to anything.
Call us: 07718 059 284 | Email: admin@electromatic.uk
Frequently Asked Questions
How much does it cost to run a heat pump per year in the UK?
At 2026 Ofgem price cap rates (electricity 24.5p/kWh), a three-bedroom home with a heat pump at COP 3.0 and 12,000 kWh annual heat demand spends approximately £980 per year on heating — before hot water. On a smart time-of-use tariff (average ~15p/kWh), this falls to around £600 per year. Savings versus a gas boiler range from £124 per year (standard tariff) to £387 per year (smart tariff) for a typical three-bedroom home (Energy Saving Trust).
How much electricity does a heat pump use per day?
A typical 8–12 kW air source heat pump heating a three-bedroom home uses approximately 10–15 kWh of electricity per day in winter and 3–5 kWh in summer (for hot water only). That works out to roughly £2–4 per day in winter and under £1 in summer at standard tariff rates.
Are heat pumps cheaper to run than gas boilers in 2026?
On a standard electricity tariff, running costs are broadly similar. On a smart tariff or with solar panels, heat pumps are significantly cheaper — saving £300–800 per year. As gas prices rise and electricity prices stabilise through renewable generation, the gap is expected to widen further (Energy Saving Trust).
What is the cheapest way to run a heat pump?
Three steps make the biggest difference: switch to a time-of-use electricity tariff with cheap off-peak rates; install solar panels to generate free electricity during the day; and ensure your home is well insulated so the heat pump runs less. Combining all three can reduce heat pump running costs to £400–£600 per year for a typical three-bedroom home.
Do heat pumps use a lot of electricity?
Heat pumps use significantly less total energy than gas boilers because they are 250–400% efficient (COP 2.5–4.0). While electricity costs more per unit than gas, you need far fewer units of energy. A heat pump typically uses 3,000–5,000 kWh of electricity per year for heating and hot water, compared to 13,000–15,000 kWh of gas for a gas boiler serving the same home.
The information in this article is for general guidance only and does not constitute financial, legal, or technical advice. Energy savings estimates are based on typical UK household data from the Energy Saving Trust and Ofgem (April 2026 price cap). Actual savings depend on your property type, insulation levels, energy usage patterns, and electricity tariff. The Boiler Upgrade Scheme (BUS) grant of £7,500 is subject to eligibility criteria set by Ofgem — not all properties qualify. Electromatic M&E Ltd operates under MCS certification via an accredited umbrella partner. All installations comply with Building Regulations Part L and MCS standards. E&OE.
Written by Electromatic M&E Ltd — ASHP & Solar installer, London & Surrey (electromatic.uk)
Last updated: April 2026 | Electromatic M&E Ltd, Company No. 13837345
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