Heat Pump Guide
Air Source Heat Pump Running Costs: Real UK Numbers for 2026
Published 4 February 2026 · 8 min read · By Northants Heat Pumps
How heat pump running costs are calculated
Three numbers decide your running cost: how much heat your home needs each year, how efficiently the heat pump produces that heat, and what you pay per unit of electricity.
- Annual heat demand: a typical UK home needs 8,000 to 15,000kWh of heat per year, lower if well insulated.
- Seasonal COP: a good installation achieves 3.0 to 4.0, so it uses one third to one quarter of that demand in electricity.
- Electricity price: standard rates sit around 25p to 28p per kWh in 2026, but heat pump tariffs offer much cheaper off-peak windows.
Heat pump vs gas vs oil: real numbers
The table below shows indicative annual running costs for a three-bed home needing roughly 12,000kWh of heat, using 2026 UK tariffs. Your figures will vary with insulation and tariff.
| Heating type | Efficiency | Indicative annual cost |
|---|---|---|
| Gas boiler | ~90% | £900 to £1,100 |
| Heat pump (standard tariff) | COP 3.2 | £950 to £1,300 |
| Heat pump (heat pump tariff) | COP 3.5 | £700 to £1,000 |
| Oil boiler | ~85% | £1,300 to £1,700 |
| LPG boiler | ~88% | £1,700 to £2,200 |
The pattern is clear: a heat pump on the right tariff competes with gas and comfortably beats oil and LPG.
What makes the difference
Insulation
Insulation is the single biggest factor. A draughty, poorly insulated home needs more heat and forces the heat pump to work harder at a lower COP, which pushes bills up. Improving loft and cavity insulation, often grant-funded, lowers both your heat demand and your running cost.
Flow temperature
Heat pumps are most efficient at low flow temperatures, around 35C to 45C. Correctly sized radiators and underfloor heating let the system run cool and efficient. Undersized radiators force a higher flow temperature and a lower COP, which is why proper system design matters.
Tariff
Dedicated heat pump tariffs, and time-of-use tariffs paired with a hot water cylinder that heats overnight, can cut running costs significantly. Choosing the right tariff is one of the easiest wins.
The bottom line
A well-designed heat pump in a reasonably insulated home, on a sensible tariff, runs at a similar cost to gas and far less than oil or LPG, while cutting your carbon emissions. The way to guarantee low running costs is a properly sized system, which starts with a heat loss survey. See how we approach it on our installation page, or get a free survey via our contact page.
Frequently asked questions
How much does it cost to run an air source heat pump per year?
A typical three-bed UK home spends roughly £850 to £1,300 per year running an air source heat pump in 2026, depending on insulation, the heat pump's seasonal efficiency and the electricity tariff. On a dedicated heat pump tariff with off-peak rates, the figure can fall below £900.
Is a heat pump cheaper to run than a gas boiler?
For a well-insulated home on a heat pump tariff, running costs are similar to or slightly below a modern gas boiler. For homes heated by oil or LPG, a heat pump is clearly cheaper. Poor insulation is the main reason a heat pump might cost more to run than expected.
What is COP and why does it matter?
COP, or coefficient of performance, measures how many units of heat a heat pump produces per unit of electricity. A seasonal COP of 3.5 means 3.5kWh of heat for every 1kWh of electricity. A higher seasonal COP means lower running costs, and good system design and insulation push it up.
Keep reading
Ready for a free heat pump quote?
Book a no-obligation site survey. We handle the grant paperwork, system design and installation from start to finish.