How Much Does It Cost to Run a Heat Pump?
A typical 3-bed semi costs £919/year on a standard tariff or just £450/year on an off-peak tariff. Your actual figure depends on property size, insulation, and the tariff you choose — here are the numbers for every common scenario.
Running costs continue for 20 years, making them more important than the one-off installation cost. This guide gives you specific figures so you can find the number that matches your home.
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The Formula: How Running Costs Are Calculated
Annual running cost = (Annual heat demand ÷ Heat pump SCOP) × Electricity price per kWh
For example: 12,000 kWh ÷ 3.2 SCOP × 24.5p/kWh = £919/year. Change any one variable and the cost changes. For the full picture on upfront and running costs combined, see our comprehensive cost guide.
Running Costs by Property Type
| Property | Heat Demand | ASHP (3.2) | GSHP (4.0) | Off-Peak |
|---|---|---|---|---|
| 1-bed flat | 5,000 kWh | £383 | £306 | £188 |
| 2-bed terrace | 8,000 kWh | £613 | £490 | £300 |
| 3-bed semi | 12,000 kWh | £919 | £735 | £450 |
| 3-bed detached | 15,000 kWh | £1,148 | £919 | £563 |
| 4-bed detached | 18,000 kWh | £1,378 | £1,103 | £675 |
| 5-bed detached | 22,000 kWh | £1,684 | £1,348 | £825 |
Standard tariff at 24.5p/kWh. Off-peak column uses 12p/kWh blended rate with ASHP SCOP 3.2.
How Insulation Affects Running Costs
| Insulation (EPC) | Heat Demand | ASHP Cost |
|---|---|---|
| Well insulated (B–C) | 9,000–10,000 kWh | £689–£766 |
| Average (D) | 12,000–14,000 kWh | £919–£1,072 |
| Poorly insulated (E–F) | 16,000–20,000 kWh | £1,225–£1,531 |
Insulation measures often cost less than expected (loft: £300–£500, cavity wall: £500–£1,500) and pay for themselves within 1–3 years. Check your property with our suitability checker.
Running Costs by Fuel Replaced
On a standard tariff, switching from oil to a heat pump can actually cost slightly more. On an off-peak tariff, every fuel switch saves money. For the full running costs analysis, see our dedicated guide.
Monthly Running Cost Breakdown
| Month | Approx. Cost | Notes |
|---|---|---|
| January | £140 | Peak demand, coldest month |
| February | £125 | |
| March | £100 | |
| April | £70 | Heating winding down |
| May–August | £22–35 | Hot water only |
| September | £30 | |
| October | £65 | Heating season starts |
| November | £115 | |
| December | £135 |
What Affects Your Running Costs Most?
- Electricity tariff — switching to off-peak cuts costs by 50%
- Insulation level — EPC B–C uses 30–50% less energy than EPC E–F
- Installation quality and SCOP — SCOP 2.8 vs 3.5 = 25% more electricity
- Property size — larger = higher demand
- Hot water demand — 15–25% of total consumption
- Climate and location — 10–20% difference across the UK
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How to Reduce Your Running Costs
- Switch to an off-peak or heat pump electricity tariff — saves £400–£700/year.
- Ensure weather compensation is active and correctly configured.
- Lower the flow temperature — each degree improves COP by 1–3%.
- Reduce legionella cycle to once per week.
- Check backup heater is not running unnecessarily — runs at COP 1.0.
- Improve insulation — even after installation.
- Reduce thermostat by 1°C — saves 8–10% on heating.
Pairing your heat pump with solar panels can offset 15–25% of annual electricity consumption, particularly for hot water in spring and summer.
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Our calculator estimates costs specific to your property, insulation, and tariff.
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Frequently Asked Questions
How much does a heat pump cost to run per day?
In winter: £3.50–£5.00/day on a standard tariff. In summer (hot water only): £0.70–£1.00/day. Average across the year: £2.00–£2.50/day standard, £1.00–£1.25/day off-peak.
Do heat pumps use a lot of electricity?
A heat pump typically uses 3,000–6,000 kWh per year. This replaces all gas consumption, so the total energy cost is what matters.
Is it cheaper to run a heat pump at night?
If you are on a time-of-use tariff, yes — pre-heating overnight takes advantage of rates as low as 8–12p/kWh. This works best in well-insulated homes.
How much electricity does a heat pump use in winter vs summer?
Roughly 70–80% of annual consumption is during October to March. Summer consumption is mainly hot water.
Why is my heat pump costing more to run than expected?
Most common causes: flow temperature too high, weather compensation not active, backup immersion running unnecessarily, legionella cycle running daily, or poorer insulation than assumed.
Will heat pump running costs go down in the future?
The UK government has committed to rebalancing energy prices to support electrification. As more renewable generation comes online, wholesale electricity costs should decrease.
About Heat Pump Running Costs
Heat pump running costs in the UK are determined by property heat demand, system efficiency (SCOP), and electricity tariff. At 2026 prices, a typical 3-bed semi costs £919/year on a standard tariff or £450/year on an off-peak tariff. This guide is part of our resource hub covering heat pump costs, running costs, air source systems, and grants. For information on reducing electricity costs with solar energy, visit Home Solar Guide.