How Much Does It Cost to Run a Heat Pump for 12 Hours?
One of the most common questions homeowners ask when considering renewable heating is: how much does it cost to run a heat pump for 12 hours? While the answer depends on factors such as the size of your property, insulation levels, outdoor temperatures and electricity tariffs, heat pumps are generally one of the most efficient heating systems available today.
Unlike traditional gas or oil boilers that generate heat by burning fuel, heat pumps transfer heat from the outside air or ground into your home. This process allows them to produce significantly more heat energy than the electrical energy they consume, resulting in lower running costs and reduced carbon emissions.
How Much Electricity Does a Heat Pump Use?
Most domestic air source heat pumps consume between 1kW and 3kW of electricity per hour depending on their size and the heating demand of the property. However, because heat pumps typically operate with a Coefficient of Performance (COP) of between 3 and 4, every 1kW of electricity used can generate 3–4kW of heat.
For example, a heat pump using 2kW of electricity per hour would consume:
- 2kW × 12 hours = 24kWh of electricity
Using the current UK electricity price cap of approximately 27p per kWh, the running cost would be:
24kWh × £0.27 = £6.48 for 12 hours of operation
Many homes will see actual costs lower than this because heat pumps rarely operate at full output continuously throughout the day.
Typical Running Costs for 12 Hours
| Heat Pump Electricity Usage | 12-Hour Consumption | Approximate Cost* |
|---|---|---|
| 1kW per hour | 12kWh | £3.24 |
| 2kW per hour | 24kWh | £6.48 |
| 3kW per hour | 36kWh | £9.72 |
*Based on an electricity rate of 27p per kWh. Actual costs will vary depending on tariff and usage patterns.
What Affects Heat Pump Running Costs?
Several factors influence how much your heat pump will cost to run over a 12-hour period:
- Property insulation: Better insulated homes require less energy to maintain comfortable temperatures.
- Outdoor temperature: Heat pumps work efficiently year-round, but colder weather can increase electricity consumption.
- Flow temperature settings: Lower flow temperatures improve efficiency and reduce running costs.
- Property size: Larger homes generally require more heating energy.
- Electricity tariff: Off-peak and smart tariffs can significantly reduce operating costs.
Are Heat Pumps Cheaper to Run Than Gas Boilers?
Modern heat pumps can often compete favourably with gas boilers, particularly in well-insulated properties. While electricity is more expensive per unit than gas, the high efficiency of a heat pump means it can generate several units of heat from each unit of electricity consumed.
According to the Energy Saving Trust, a well-designed heat pump system can reduce both carbon emissions and long-term heating costs when compared with older heating systems.
Can Solar Panels Reduce Heat Pump Running Costs?
Absolutely. Many homeowners choose to combine a heat pump with solar PV panels. By generating your own electricity during daylight hours, you can offset some of the electricity required to run the heat pump, further reducing energy bills and improving the overall return on investment.
If you’re considering renewable heating, our team at Clear Skies Energy can assess your property and recommend the most efficient heat pump solution for your home.
Get Expert Heat Pump Advice
Every property is different, which is why accurate heat pump sizing and system design are essential. At Clear Skies Energy, we provide professional surveys, installations and ongoing support to help homeowners maximise efficiency and minimise running costs.
Contact Clear Skies Energy today to discover how much a heat pump could save your household and whether renewable heating is the right solution for your property.
