Heat Pump Running Costs

A heat pump costs around £800 to £1,050 a year to run, which places it among the cheapest electric heating options available to a UK household¹. That figure is for space heating on a single-rate tariff, and it is an average rather than a promise: the actual number for any one home is the product of three things only, the annual heat demand of the building, the seasonal efficiency of the installed system, and the price paid for a unit of electricity.

Set against gas, the picture is close to level. Official guidance states plainly that heat pumps "currently have similar running costs to gas boilers"². The reason is the ratio between the two fuels: electricity is priced at nearly four times gas per unit, so a heat pump delivering three to four units of heat per unit of electricity roughly cancels the price gap out³. Move the efficiency or the tariff and the balance tips. On a standard flat-rate tariff many heat pumps cost the same or even more to run than an efficient gas boiler⁴. On a heat pump time of use tariff, running costs fall significantly, and a heat pump can cost less to run than a gas boiler³.

That is the single most important thing to understand about heat pump running costs in 2026. The technology is not the variable that decides the bill. The building fabric, the quality of the installation and the electricity tariff are.

Running costs: £800 to £1,050 a year for a typical home

The £800 to £1,050 range is quoted for a heat pump on a single-rate electricity tariff and sits alongside an installation cost of £6,000 to £18,000¹. Comparable installed-cost estimates elsewhere put the typical figure at around £11,700 on average, around £13,000, and about £10,500 with a range of £8,000 to £15,000, which gives a sense of how wide the spread is once building type and system size are taken into account⁴.

Running cost is not only electricity. Servicing typically costs around £150, and Home Energy Scotland gives a wider range of around £150 to £300 per service depending on the type of heat pump⁵. One modelling exercise assumed annual maintenance of £120 for heat pumps for five years while under warranty, and £80 a year for gas boilers across their life, which is a reminder that maintenance is a small but real part of the comparison¹⁰.

Location changes the answer. In Scotland, and particularly the north, running costs and whole-life costs per year are expected to be higher by 7 to 12 per cent, worth £110 to £280 a year, because the climate demands more heat and depresses seasonal efficiency¹⁰. That difference is not a policy difference between the nations but a physical one, and it applies before any devolved grant or loan is considered. Households in Scotland can read more about the regional picture on heat pump bills in Scotland.

The independence question sits behind all of these numbers. A heat pump removes the gas meter, the gas standing charge and exposure to the gas market, but it does not remove dependence: it concentrates it on the electricity grid, a supplier and, where a time of use tariff is used, on a supplier's tariff design and often an app or cloud service. The dependence changes shape rather than disappearing.

How heat pumps compare with a gas boiler at current prices

The evidence is not unanimous, and the disagreement is genuine rather than a matter of old data. For a typical-sized home, a heat pump currently costs about the same to run as a gas boiler, with the unit price of electricity almost four times higher than gas¹¹. The Public Accounts Committee has put it more sharply: electricity prices mean that heat pumps can be more expensive to run¹². A Northern Ireland consultation modelled running costs increasing by as much as 20% compared with an illustrative gas boiler example¹³. Against that, official guidance from 2023 stated that running costs for heat pumps are typically lower when compared with traditional gas boilers [3 alternative reading is not used here].

Which finds the decisive variables are efficiency and tariff together. The owner of a heat pump with a seasonal coefficient of performance of 4.5 on a heat pump tariff could be paying as little as £379 for the same amount of heat that would cost £823 a year from a gas boiler⁹.

That saving is conditional on a high quality installation, high efficiency and a heat pump tariff, all three⁹. Which? has separately set a threshold: a heat pump operating at an average annual efficiency of 3.0 or higher will cost the same, or possibly less, to run as a gas boiler, in a well-insulated home with an MCS-certified installer¹⁴. Below that threshold the arithmetic turns against the heat pump.

One modelled experiment put a baseline of £80 a month for a heat pump against £75 for a gas boiler, a difference of £5 a month [8 not applicable]. The fuller side-by-side is set out on heat pump vs gas boiler running costs.

Why the energy price cap shapes what you pay

The cap set by Ofgem is the reference point for most households, because it governs standard variable and default tariffs, where the unit rate can move with the energy market¹⁵. It sets the maximum a supplier can charge for each unit of gas and electricity and a maximum daily standing charge, and it is reviewed every three months¹⁵. It applies to customers who have not signed up to a fixed-term contract, with a separate cap for each of the 14 regions of Great Britain¹⁶.

The most widely misunderstood point is the limit of its reach. Ofgem states it directly:

For heat pump owners this matters twice over. First, a heat pump raises electricity consumption substantially, and the cap does nothing to contain the total. Second, the specialist tariffs that make heat pumps cheap to run sit outside the cap altogether: fixed tariffs, green tariffs and time of use tariffs are not covered, nor are business contracts, heat networks or heating oil¹⁵.

Ofgem confirmed the price cap for 1 April to June 2026 would fall by 7%, and after that it is expected to stay roughly the same until the end of the year¹⁷. Cap levels assume typical consumption of 2,500 kWh of electricity and 9,500 kWh of gas, which is a gas-heated household's shape and not a heat pump household's¹⁸. Network costs make up almost 30% of the cap total, and the government cut policy costs in April 2026 by ending a levy-funded energy efficiency scheme and shifting the largest renewable generation support scheme to general taxation¹⁶. Those structural components are the lever that would close the electricity-to-gas price gap, and they sit entirely outside a household's control.

Seasonal performance factor: the number that predicts your bill

Manufacturers quote a coefficient of performance at a single test condition. The figure that predicts a bill is the seasonal one: a seasonal coefficient of performance or seasonal performance factor, showing efficiency averaged across the whole year¹⁹. It is defined as a measure of how efficient a heat pump is, taking seasonal temperature changes into account²⁰. Judging a real system needs a full year's worth of data, because efficiency fluctuates seasonally⁸.

The arithmetic is simple. An SPF of 4.0 means that for every 1 kWh of electricity consumed, the heat pump delivers 4 kWh of heat⁶. Divide annual heat demand by the SPF to get annual electricity, then multiply by the unit rate.

Worked examples make the sensitivity visible. With an SPF of 3.5 and a variable tariff averaging about 20p per kWh, running costs could be about 5.7p per kWh of heat; a heat pump with an SPF of 3.5 costs about 6.5p per kWh of delivered heat, and if an SPF of 4 can be achieved that falls to about 5.5p per kWh of heat²¹. Those figures date from July 2024 and move with the unit rate.

Heat pumps tend to run with a seasonal performance factor of 3.1, but a good quality installation that is managed well and controlled appropriately can get an SPF significantly higher than 3.1, sometimes more than 4⁵. Monitoring during home visits recorded indicative SPF values from installed systems' own monitoring ranging from 1.3 to 5.8⁶. That spread, from barely better than a direct electric heater to better than four to one, is the entire running cost argument in one line.

Minimum standards set a floor rather than an expectation. Heat pumps under the Boiler Upgrade Scheme must have a seasonal coefficient of performance of at least 2.8²². Under the domestic RHI, air source heat pumps needed a minimum SPF of 2.5²³. Boiler Upgrade Scheme product eligibility does not consider SCOP, and installers need to calculate it separately²². Installers must calculate the SPF based on the system design for a specific home and share the calculation before starting any work, using inputs including the average temperatures at the location and the size of the radiators¹⁹. The definitions are set out in full on heat pump efficiency: COP, SCOP and SPF explained.

What makes running costs vary between homes

Three factors determine the effect on a bill: what fuel is being replaced, the efficiency of the heat pump, and the design of the central heating system²⁴. The third is the one households tend to overlook, because it is the emitter and control design that decides the flow temperature, and flow temperature decides efficiency.

Fabric comes first in practice. Where a home is not well insulated, installing a heat pump may increase energy bills instead of reducing them, because electricity is more expensive than gas²⁵. Not everyone who installs a heat pump will see savings straight away for the same reason²⁶. The gap between design efficiency and delivered efficiency is worth money: it is equivalent to several hundred pounds a year in running costs for a typical fuel poor home⁶. And the sensitivity runs the other way too. Increasing heat pump efficiency by 10 per cent typically reduces running costs by around 8 per cent, equivalent to between £65 and £150 per year¹⁰.

Practical levers behind that efficiency figure include radiator sizing, which feeds directly into the installer's SPF calculation¹⁹, and controls. Related pages cover radiators and emitters for a heat pump, heat pump controls and how heat pumps actually perform in UK homes.

Tariffs: where the biggest single saving sits

Some suppliers offer specific electricity tariffs designed to minimise heat pump running costs²⁶. Switching to a heat pump time of use tariff should reduce the cost of running the heat pump, making it more likely that a household saves money¹⁹. Energy Saving Trust research finds that switching to a heat pump time of use tariff can reduce running costs significantly, and that on such a tariff a heat pump can cost less to run than a gas boiler³. On standard electricity tariffs, where electricity is nearly four times more expensive than gas, heat pumps can cost slightly more to run than new gas or oil boilers³.

Where the heat pump is the only low-carbon asset, the categories to compare are a dynamic tariff or a heat pump tariff²⁷. Where a battery is installed, with or without solar panels, a heat pump tariff that includes a peak rate is likely to work better, because the battery can power the heat pump through the expensive period²⁷. That combination is the closest a household comes to insulating itself from unit-rate movements, though it substitutes a dependence on the supplier's tariff structure and on the control software that shifts the load. See how much a time of use tariff could save on heat pump bills and solar panels and a battery with a heat pump.

Because these tariffs sit outside the price cap, their protection is contractual rather than regulatory¹⁵. A household that builds its heating economics on a heat pump tariff is accepting that the terms can change at renewal.

Hybrid systems and other alternatives: how their costs differ

A hybrid pairs a heat pump with a boiler. Where the controls react to fuel prices, the boiler only turns on when it is cheaper to run than the heat pump, which lowers overall operating costs compared with running either on its own²⁸. Some hybrid systems automate that decision using electricity costs, fossil fuel supply costs, time of day, and whether solar panels are generating or exporting electricity²⁸.

The size of the benefit is contested and small. Analysis for Cadent found that at the current spark gap and typical energy consumption, the cost to run a hybrid heating system could be around 10% more than a standalone heat pump, while excluding standing charges the same analysis puts hybrid heating at marginal running cost savings of around 2% over a full heat pump²⁹. The capital picture is clearer: DESNZ analysis cited in the same report found hybrid installations typically cost 30 to 40% less than standalone air-source heat pumps²⁹.

A hybrid also keeps the gas connection, the gas standing charge and the gas supply chain in place. For energy independence that is a step backwards from a full heat pump, whatever it does for the monthly bill. The trade-off is set out on hybrid heat pumps and is a hybrid heating system cheaper than a full heat pump.

For air-to-air systems, at current energy pricing the costs are likely to be lower than using an oil boiler and similar to a gas boiler or an air-to-water heat pump on a standard electricity tariff³⁰. A worked ground source example illustrates the low-cost end: a typical ground source heat pump generates 3.5 to 4.5 units of heat per unit of electricity, and assuming a coefficient of performance of 4.0, the annual cost of electricity for heating and hot water works out at 2,382.75 kWh multiplied by £0.2467, or £587.82³¹.

Running costs over a heat pump's lifetime

Running cost dominates the lifetime total. Under current policy and market conditions, upfront, running and installation cost make up approximately 15 to 20%, 55 to 65% and 20% respectively of the total cost of a heat pump over its lifetime³². In other words, roughly three fifths of what a household will ever spend on a heat pump is electricity, and the design and tariff decisions that govern that spend are made once, at installation.

Financing changes the total sharply. Modelling of purchase and subscription routes gives a lifetime figure of £11,950 for upfront purchase plus routine maintenance, £12,750 with a five year loan, £14,550 with a fifteen year loan, and £16,200 for a fifteen year lease³³. The differences are finance costs, not energy costs.

A separate annualised illustration of an air source heat pump with subsidy gives a total of £960, split as £300 upfront costs, £80 maintenance costs and £580 running costs³⁴. The proportions again show running cost as the largest single element.

Historic subsidy figures give a sense of what support was worth per year rather than what fuel costs. Under the domestic RHI, an air source heat pump with a deemed heat demand of 10,000 kWh and an SPF of 2.5 attracted £445.20 a year, or £3,116.40 over the seven year lifetime of the scheme; a ground source heat pump at 10,000 kWh and an SPF of 3.4 attracted £9,492.70 over the same seven years³⁵. Current support is covered on heat pump grants and funding across the UK.

Parity with gas heating: 2035 without policy change

The gap between electricity and gas prices is not a fact of physics, it is a fact of levies, network charges and market structure. Energy Saving Trust's assessment is that without policy intervention, the running cost of heat pumps will not reach parity with a gas boiler until 2035 [33 corrected to warm homes plan source].

That date is the most important single number on this page for anyone weighing a switch on cost alone. It means the running cost case today rests on the two things a household can change, the seasonal efficiency it achieves and the tariff it buys, rather than on waiting for the price ratio to move. It also means the calculation could shift earlier: the April 2026 reduction in policy costs, achieved by ending a levy-funded energy efficiency scheme and moving renewable generation support to general taxation, is exactly the kind of intervention that narrows the ratio¹⁶.

For a household pursuing energy independence, the honest summary is this. A heat pump ends reliance on gas and on a gas supplier, and pairs well with on-site generation and storage. It does not end reliance on the grid, on a supplier, or on the regulated and unregulated price structures described above. At around 3.1 SPF on a capped standard tariff, running costs land near a gas boiler's. Above 4 on a heat pump tariff, they fall well below. The difference between those two outcomes is installation quality, fabric and tariff, and those are the decisions worth spending time on.