Air Source Heat Pump Running Costs UK | 2026 Guide
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Quick Answer: How Much Does an Air Source Heat Pump Cost to Run?
A well-designed air source heat pump may cost around £650 to £1,600 per year to provide heating and hot water in many UK homes.
For example, a property needing 12,000kWh of useful heat would cost about £979 per year if the heat pump achieved a seasonal efficiency, or SCOP, of 3.2 and electricity cost 26.11p/kWh.
However, homes with higher heat demand or lower heat-pump efficiency can spend considerably more.
Therefore, the best way to estimate your running cost is to use your property’s expected annual heat demand, the predicted SCOP and your electricity tariff rather than relying on a national average.
Air Source Heat Pump Running Costs: How Much Does It Cost to Run One in the UK?
If you are thinking about replacing a boiler, one question matters more than almost any other: how much will an air source heat pump cost to run?
For many UK homes, air source heat pump running costs may fall somewhere between £650 and £1,600 a year for heating and hot water. However, there is no reliable single average because every property loses heat at a different rate.
Your actual bill depends mainly on four things: how much heat your home needs, the efficiency of the heat pump, the electricity price you pay and the temperature at which the heating system operates.
Therefore, this guide focuses on the numbers that matter. You will see realistic 2026 cost examples, comparisons with gas heating and practical ways to reduce electricity use.
If you want a basic introduction to the technology first, read our Air Source Heat Pump Explained guide instead.
Want figures based on your own property? Get a free air source heat pump quote and ask for the expected annual electricity use as part of the survey.
Typical Air Source Heat Pump Running Costs in 2026
The most useful starting point is your home’s annual heat demand.
In simple terms, you can estimate electricity use with this calculation:
Annual heat demand ÷ SCOP = approximate electricity consumption
You can then calculate the cost:
Electricity consumption × electricity unit rate = estimated running cost
For example, Ofgem’s average Direct Debit electricity rate for 1 July to 30 September 2026 is 26.11p/kWh. The figures below use that rate and exclude standing charges.
| Annual useful heat demand | SCOP 2.5 | SCOP 3.2 | SCOP 4.0 |
|---|---|---|---|
| 8,000kWh | £836 | £653 | £522 |
| 12,000kWh | £1,253 | £979 | £783 |
| 16,000kWh | £1,671 | £1,306 | £1,044 |
| 20,000kWh | £2,089 | £1,632 | £1,306 |
As the table shows, efficiency makes a substantial difference.
For instance, a home needing 16,000kWh of heat would spend about £1,671 at SCOP 2.5. At SCOP 4.0, the same heat demand falls to roughly £1,044.
However, these figures are examples rather than quotations. A property survey is still needed to estimate heat demand and expected performance properly.
In addition, heating costs are seasonal. Therefore, you should not divide the yearly figure by 12 and expect the same bill every month. Winter electricity use will normally be much higher than summer use.
What Affects Air Source Heat Pump Running Costs?
Several factors can change the final bill. However, some matter much more than others.
Your Home’s Heat Demand
First, the more heat your property loses, the more energy the heating system must replace.
A larger home will often need more heat. However, size is only part of the picture. Insulation, glazing, draughts, indoor temperature and occupancy also matter.
Therefore, two houses of the same size can have very different heating costs.
Seasonal Efficiency
Next, look at the expected SCOP rather than relying only on the manufacturer’s headline COP.
A SCOP of 3.2 means the system provides roughly 3.2kWh of heat for every 1kWh of electricity used over the relevant season.
As a result, a higher seasonal efficiency normally means a lower electricity bill for the same amount of heat.
Flow Temperature
Flow temperature is also important because heat pumps generally become less efficient when they have to produce hotter water.
Therefore, a system that keeps a property warm with lower-temperature water will usually cost less to run than one that regularly needs very high flow temperatures.
Radiator size, heat loss and system controls all affect the required temperature.
For more detail on this part of the system, see how an air source heat pump heats your home.
Your Electricity Tariff
Your tariff can also change the calculation significantly.
The Ofgem price cap is useful for consistent comparisons. However, it is not necessarily the cheapest electricity available to a heat-pump owner.
For example, some suppliers offer heat-pump tariffs or time-of-use rates with cheaper electricity during certain periods.
Therefore, two identical homes with identical heat pumps could still have different annual bills simply because they pay different electricity prices.
Hot Water Use
Finally, hot water can increase electricity consumption.
Domestic hot water normally needs a higher temperature than space heating. Consequently, heat-pump efficiency may fall while the cylinder is being heated.
Large households may therefore spend more on hot water than couples or single-person households.
Air Source Heat Pump vs Gas Boiler Running Costs
Comparing electricity and gas unit prices alone gives the wrong impression.
Gas is cheaper per kWh. However, a heat pump can turn one unit of electricity into several units of useful heat.
A gas boiler cannot do that.
What Does Useful Heat Cost?
Using Ofgem’s July to September 2026 average rates, electricity costs 26.11p/kWh and gas costs 7.33p/kWh.
A 90%-efficient gas boiler therefore costs about 8.14p for each kWh of useful heat.
Meanwhile, a heat pump achieving SCOP 3.2 costs about 8.16p for each kWh of useful heat.
Therefore, at these rates, SCOP 3.2 is approximately the fuel-cost break-even point against a 90%-efficient gas boiler.
| Heating option for 12,000kWh useful heat | Jul–Sep 2026 | From Oct 2026 |
|---|---|---|
| Heat pump – SCOP 3.0 | £1,044 | £1,053 |
| Heat pump – SCOP 3.2 | £979 | £987 |
| Heat pump – SCOP 3.5 | £895 | £902 |
| Gas boiler – 90% efficient | £977 | £1,063 |
These examples exclude standing charges.
What Changes From October 2026?
From 1 October 2026, Ofgem’s average Direct Debit electricity rate rises slightly to 26.32p/kWh. However, the average gas rate rises more sharply to 7.97p/kWh.
As a result, the approximate heat-pump break-even point against a 90%-efficient gas boiler falls from around SCOP 3.2 to SCOP 3.0.
In other words, an efficient heat pump becomes more competitive with gas on fuel costs under the October rates.
In addition, a household that removes its gas supply completely may avoid the gas standing charge. That can improve the overall comparison further.
However, the result will still depend on the tariff available to you and the performance achieved in your home.
How to Reduce Air Source Heat Pump Running Costs
Fortunately, lowering running costs does not always require buying more equipment.
Instead, good settings and sensible energy use can make a meaningful difference.
- Use the lowest suitable flow temperature. Lower water temperatures generally improve heat-pump efficiency.
- Use weather compensation correctly. This allows the system to reduce its flow temperature when the weather becomes milder.
- Avoid extreme thermostat setbacks. Heat pumps often work best by maintaining a steady temperature rather than repeatedly reheating a cold property.
- Check radiator output. Suitable radiators can help the system deliver enough heat without unnecessarily high water temperatures.
- Compare electricity tariffs. A suitable heat-pump or time-of-use tariff may lower the price paid for electricity.
- Avoid unnecessary immersion-heater use. Direct electric heating is normally more expensive than allowing the heat pump to heat the cylinder.
- Monitor performance. Where possible, compare electricity consumed with heat produced so you can spot poor seasonal efficiency.
Therefore, running a heat pump well can be just as important as choosing the unit itself.
Do Heat Pumps Cost More to Run in Winter?
Yes, winter running costs will usually be higher.
First, your home loses heat more quickly when the temperature outside falls. Therefore, the heat pump needs to provide more heat.
Second, an air source heat pump may become less efficient as outdoor temperatures fall.
Defrost cycles can also use some additional energy during cold and damp conditions.
However, a higher January electricity bill does not automatically mean the heat pump is performing badly. What matters more is the system’s performance across the whole heating season.
A properly designed system should also meet the property’s winter heat demand without depending heavily on direct electric backup heating.
Can Solar Panels Reduce Heat Pump Running Costs?
Yes, solar panels can provide some of the electricity used by a heat pump.
However, there is an obvious seasonal mismatch. Solar panels generate most strongly during spring and summer, while heating demand peaks during autumn and winter.
Even so, solar generation can still contribute to hot water and heating during daylight hours.
A battery may also help in some homes. For example, it can store surplus solar power or cheap off-peak electricity for use later.
However, a battery should not automatically be assumed to pay for itself simply because a heat pump is being installed. The result depends on the tariff, battery cost and household electricity pattern.
Is an Air Source Heat Pump Cheaper to Run Overall?
Sometimes it is. However, the answer depends heavily on what heating system you are replacing.
Against direct electric heating, LPG or some oil systems, the financial case can be attractive.
Against a modern gas boiler, the comparison is closer. Therefore, seasonal efficiency and electricity tariff become particularly important.
Upfront grants should also be kept separate from running-cost calculations.
The Boiler Upgrade Scheme can reduce the installation price for eligible households. However, it does not reduce the amount of electricity the heat pump needs.
You can read the latest eligibility and grant information in our Boiler Upgrade Scheme 2026 update.
Therefore, compare total ownership cost, not just one year’s electricity bill. Consider installation cost after grants, expected running costs, tariff choice and the heating system you would otherwise need to replace.
How to Estimate Your Heat Pump Running Costs Before Buying
Before accepting a quotation, ask for the assumptions behind the predicted energy bill.
In particular, ask for:
- Your estimated annual space-heating demand in kWh.
- Your estimated hot-water demand.
- The expected seasonal efficiency or SCOP.
- The electricity price used in the calculation.
- The proposed design flow temperature.
- Estimated annual heat-pump electricity consumption.
- Estimated annual running cost.
Then check the calculation yourself.
Annual heat demand ÷ expected SCOP × electricity price
For example, if your expected annual heat demand is 14,000kWh and the predicted SCOP is 3.5:
14,000 ÷ 3.5 = 4,000kWh of electricity
At 26.11p/kWh:
4,000 × £0.2611 = £1,044.40 per year
That simple calculation gives you a useful sense check.
However, be cautious if a quotation promises very low bills without showing its heat-demand and efficiency assumptions.
If you want the technical details behind the process, our guide to how air source heat pumps work covers that separately.
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Frequently asked questions
Find clear answers to common questions comparing air source and ground source heat pumps, including efficiency, installation and running costs, winter performance, noise, land requirements and borehole depth.
There is no reliable fixed monthly cost because heating demand changes throughout the year. Therefore, winter bills are normally much higher than summer bills.
Divide annual heat demand by the heat pump's SCOP. For example, 12,000kWh of heat at SCOP 3.2 requires about 3,750kWh of electricity.
It can be. However, the answer depends mainly on seasonal efficiency and the electricity and gas prices being compared.
Generally, a higher SCOP means lower running costs. However, actual performance depends on the property, flow temperature, weather and hot-water use.
Possible reasons include high heat demand, high flow temperatures, cold weather, an expensive electricity tariff or frequent direct electric backup heating.
Potentially. For example, some tariffs offer cheaper electricity at certain times or rates aimed specifically at heat-pump users.
Yes. Your property needs more heat in cold weather and air-source efficiency can also fall as outdoor temperatures drop.
Long running periods can be normal. In fact, heat pumps often work more efficiently by supplying steady heat instead of repeatedly switching between hot and cold.
Generally, reducing indoor temperature reduces heat demand. However, very large daily temperature setbacks may not suit every heat-pump system.
It can. Therefore, unnecessary immersion-heater use should normally be avoided because it uses direct electric resistance heating.
It depends on household use and cylinder settings. Consequently, larger households will normally use more energy for hot water.
Potentially. Larger emitters can help deliver enough heat at lower flow temperatures, which may improve efficiency.
Yes. Better insulation reduces heat loss. As a result, the heat pump has less work to do.
Solar panels can supply some of its electricity. However, solar generation is lowest during the months when heating demand is highest.
Sometimes. However, the financial case depends on battery cost, tariff structure and how your household uses electricity.
Conclusion
Air source heat pump running costs depend mainly on heat demand, seasonal efficiency, flow temperature and electricity price.
For example, at current September 2026 capped electricity rates, a home needing 12,000kWh of useful heat would spend about £979 per year if its heat pump achieved SCOP 3.2.
That is close to the fuel cost of producing the same heat with a 90%-efficient gas boiler.
However, from October 2026, higher capped gas rates make the comparison more favourable to an efficient heat pump.
Therefore, do not base your buying decision on a generic national average.
Instead, ask for a property-specific running-cost estimate that shows the expected heat demand, SCOP, electricity use and tariff assumptions.
Ready to compare the figures for your property? Get a free air source heat pump quote and ask for the estimated annual running cost in writing.
