Will a heat pump cut your heating bills? Compare the running costs.
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A heat pump's seasonal coefficient of performance (SCOP) says how many kWh of heat you get per kWh of electricity — typically 3 to 4 for a well-designed air source system. A gas boiler turns about 85–92% of the gas into heat.
The heat pump is cheaper to run when electricity costs less than the gas price × SCOP ÷ boiler efficiency. Heat-pump tariffs, solar panels and dropping the gas standing charge improve the sums.
| Gas used a year for heating & hot water | 12,000 kWh |
| Gas price per kWh | 0.07 |
| Gas standing charge a day (saved if you disconnect) | 0.33 |
| Boiler efficiency | 90% |
| Electricity price per kWh | 0.26 |
| Heat pump SCOP | 3.2 |
| Installation cost (optional) | 0 |
| Grant (optional) | 0 |
| Currency | £ |
| Yearly saving with a heat pump | £83 |
| Gas boiler cost | £960 a year (incl. standing charge) |
| Heat pump running cost | £878 a year |
| Heat needed | 10,800 kWh |
| Electricity used | 3,375 kWh at SCOP 3.2 |
| Break-even electricity price | £0.249 per kWh |
£83.
| Gas used a year for heating & hot water | 12,000 kWh |
| Gas price per kWh | 0.07 |
| Gas standing charge a day (saved if you disconnect) | 0.33 |
| Boiler efficiency | 90% |
| Electricity price per kWh | 0.15 |
| Heat pump SCOP | 3.2 |
| Installation cost (optional) | 0 |
| Grant (optional) | 0 |
| Currency | £ |
| Yearly saving with a heat pump | £454 |
| Gas boiler cost | £960 a year (incl. standing charge) |
| Heat pump running cost | £506 a year |
| Heat needed | 10,800 kWh |
| Electricity used | 3,375 kWh at SCOP 3.2 |
| Break-even electricity price | £0.249 per kWh |
£454.
It depends on prices and efficiency; with SCOP 3.5 and electricity under about 3.5 × the gas price, usually yes.
3.0–4.0 for air source, 4+ for ground source; good design and low flow temperatures matter.
About heat demand ÷ SCOP: a home needing 10,800 kWh of heat uses about 3,400 kWh at SCOP 3.2.
In England and Wales the Boiler Upgrade Scheme gives £7,500; many US states and utilities offer rebates.