Heat Pump Electricity Cost per Year UK
A typical 3-bed semi uses 3,833 kWh of electricity for heating, costing £939/year on a standard tariff or £690/year on a time-of-use tariff. Your actual figure depends on three variables — here is how to calculate it.
Installation cost is a one-off event. Electricity cost is what you pay every month for the next 20 years. This guide shows you exactly how to calculate yours.
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The Formula
Annual electricity cost = (Annual heat demand ÷ Seasonal COP) × Electricity unit rate
The three variables: heat demand (your property), SCOP (installation quality), and electricity price (your tariff). For the full running cost picture, see our comprehensive cost guide.
| System Quality | SCOP Range | Description |
|---|---|---|
| Excellent | 3.2–3.8 | Low flow temp, good insulation, weather compensation |
| Good | 2.8–3.2 | Moderate flow temp, average insulation |
| Below average | 2.2–2.8 | High flow temp, poor insulation, no weather comp |
Electricity Costs by Property Size
| Property | Heat Demand | HP Electricity | Standard (24.5p) | TOU (18p) |
|---|---|---|---|---|
| Small flat/cottage | 5,500 kWh | 1,833 kWh | £449 | £330 |
| 3-bed semi | 11,500 kWh | 3,833 kWh | £939 | £690 |
| 4-bed detached | 19,000 kWh | 6,333 kWh | £1,552 | £1,140 |
| 5-bed detached | 28,000 kWh | 9,333 kWh | £2,287 | £1,680 |
Based on Ofgem Q1 2026 prices. TOU column uses 18p/kWh blended rate.
How COP Changes Everything
For the 3-bed semi (11,500 kWh heat demand) at 24.5p/kWh:
This is why installation quality matters. A well-designed system with proper weather compensation pays for itself through lower electricity bills.
What About Hot Water?
Hot water accounts for 15–25% of total heat demand. COP for hot water is lower (2.2–2.8) because the water must be heated to higher temperatures (48–52°C). For a typical household: approximately £270–£440/year for hot water. The legionella cycle adds £30–£60/year.
How to Reduce Your Heat Pump Electricity Cost
- Lower the flow temperature — weather compensation does this automatically
- Switch to a time-of-use tariff — saves 20–35%
- Improve insulation — loft top-up can reduce demand by 10–15%
- Ensure weather compensation is working
- Use the heat pump correctly — steady long runs, not short bursts
Pairing with solar panels can offset 15–25% of annual consumption, particularly for hot water in the warmer months. For a detailed look at all running costs, see our dedicated guide.
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Frequently Asked Questions
How much electricity does a heat pump use per day?
Cold winter day: 15–25 kWh (£3.70–£6.10). Mild autumn: 5–10 kWh. Summer (hot water only): 3–5 kWh (£0.75–£1.25).
Will my electricity bill double if I get a heat pump?
Your electricity bill increases but your gas/oil bill disappears. Total energy costs are typically similar or slightly lower.
Is electricity going to get cheaper for heat pump owners?
The UK government has indicated plans to rebalance energy levies, which would reduce the electricity unit rate.
Can solar panels reduce my heat pump electricity cost?
Yes, but mainly for hot water in spring/summer/autumn. A 4 kW array might offset 15–25% of annual consumption. Visit our solar guide for costs.
How do I monitor my heat pump’s electricity usage?
Built-in monitoring, dedicated energy monitors, or your smart meter display. Monitoring helps spot efficiency drops early.
What if my electricity costs are much higher than estimates?
Check flow temperature, weather compensation, backup heater, and legionella cycle frequency. Ask your installer to check the seasonal performance factor.
About Heat Pump Electricity Costs
Heat pump electricity costs depend on property heat demand, seasonal COP, and tariff. A typical UK home uses 3,000–6,000 kWh of electricity for heat pump operation, costing £449–£1,552/year at standard rates. This guide is part of our resource hub covering costs, running costs, air source systems, and grants. For advice on reducing electricity costs with solar, visit Home Solar Guide.