Heat Pump Payback Calculator
Calculate if a heat pump is financially worthwhile for your home. Compare installation costs, running costs, government grants, and payback period over 15-20 years.
Cumulative Savings Over Time
Installation Cost Breakdown
Running Cost Comparison (Annual)
20-Year Financial Projection
Heat Pump Payback Calculator UK 2026
Our Heat Pump Payback Calculator helps you decide if installing a heat pump is financially worthwhile for your home. Compare installation costs, government grants, running costs, and calculate your payback period over 15-20 years. Whether you’re considering an air source or ground source heat pump, this tool gives you accurate estimates for 2026.
How Much Does a Heat Pump Cost in the UK?
Heat pump installation costs vary significantly depending on the type and your property size. Air source heat pumps are cheaper and more common, while ground source heat pumps are more expensive but more efficient.
| Heat Pump Type | Typical Installation Cost | Boiler Upgrade Scheme Grant | Net Cost After Grant |
|---|---|---|---|
| Air Source Heat Pump | GBP8,000 – GBP14,000 | GBP7,500 | GBP500 – GBP6,500 |
| Ground Source Heat Pump | GBP18,000 – GBP35,000 | GBP18,000 | GBP0 – GBP17,000 |
How to Use This Calculator
- Select your current heating system – Gas boiler, oil boiler, LPG, or electric storage heaters.
- Choose your property size – Small (1-2 bed), medium (3 bed), or large (4+ bed).
- Enter your current annual heating bill – Check your last year’s energy statements for accuracy.
- Assess your insulation quality – Poor, average, or good insulation affects heat pump efficiency.
- Select heat pump type – Air source (cheaper) or ground source (more efficient but expensive).
- Enter installation cost estimates – Get 3 quotes from MCS-certified installers.
- Apply government grant – GBP7,500 for air source, GBP18,000 for ground source (Boiler Upgrade Scheme).
- Click Calculate Payback to see your results.
Do Heat Pump Grants Still Exist in 2026?
Yes. The Boiler Upgrade Scheme (BUS) continues through 2028, offering:
- GBP7,500 off air source heat pump installations
- GBP18,000 off ground source heat pump installations
- Eligibility: Must be replacing a fossil fuel heating system (gas, oil, LPG)
- Must use MCS-certified installer
- Property must have valid Energy Performance Certificate (EPC)
The scheme is funded until 2028 with a GBP3.9 billion budget. Applications are processed by the installer, who deducts the grant directly from your final bill.
Heat Pump vs Gas Boiler: Running Cost Comparison
| Property Type | Gas Boiler Annual Cost | Air Source Heat Pump Annual Cost | Annual Savings |
|---|---|---|---|
| Small 2-bed flat | GBP600 – GBP800 | GBP550 – GBP700 | GBP50 – GBP100 |
| Medium 3-bed house | GBP900 – GBP1,200 | GBP750 – GBP950 | GBP150 – GBP250 |
| Large 4+ bed house | GBP1,400 – GBP2,000 | GBP1,100 – GBP1,500 | GBP300 – GBP500 |
*Based on average UK gas price of 10.5p/kWh and electricity price of 24.5p/kWh with typical SCOP of 3.5. Actual savings depend on insulation, heating hours, and tariff.
Factors That Affect Heat Pump Payback Period
- Insulation quality: Well-insulated homes with underfloor heating or oversized radiators get the best heat pump efficiency. Poorly insulated homes may see minimal savings.
- Heating degree days: Colder climates require more heating. Northern Scotland pays back slower than southern England.
- Electricity tariff: Off-peak tariffs like Octopus Go reduce running costs by 25-30%. Time-of-use tariffs maximise savings.
- Existing heating system: Replacing expensive oil or LPG yields faster payback than replacing cheap gas.
- Installation quality: Poorly sized or installed systems underperform. Always use MCS-certified installers.
Air Source vs Ground Source Heat Pumps
| Feature | Air Source Heat Pump | Ground Source Heat Pump |
|---|---|---|
| Installation cost | GBP8,000 – GBP14,000 | GBP18,000 – GBP35,000 |
| Efficiency (SCOP) | 3.0 – 3.8 | 3.5 – 4.5 |
| Lifespan | 15-20 years | 20-25 years |
| Space required | Small outdoor unit | Large garden for ground loops |
| Noise level | Audible fan (40-60 dB) | Quiet (no external fan) |
| Payback period | 5-12 years | 10-18 years |
Typical Payback Scenarios (2026)
| Scenario | Installation Cost | Grant | Net Cost | Annual Savings | Payback Period |
|---|---|---|---|---|---|
| 3-bed semi, gas boiler | GBP12,000 | GBP7,500 | GBP4,500 | GBP250 | 18 years |
| 3-bed semi, oil boiler | GBP12,000 | GBP7,500 | GBP4,500 | GBP600 | 7.5 years |
| 4-bed detached, gas boiler | GBP14,000 | GBP7,500 | GBP6,500 | GBP350 | 18.5 years |
| 4-bed detached, oil boiler | GBP14,000 | GBP7,500 | GBP6,500 | GBP900 | 7.2 years |
| Ground source (any) | GBP25,000 | GBP18,000 | GBP7,000 | GBP400 | 17.5 years |
Note: Payback periods lengthen as gas prices stabilise and electricity prices rise. Best savings come from replacing oil/LPG or combining with solar panels.
How to Maximise Heat Pump Savings
- Improve insulation first: Loft insulation, cavity wall insulation, and double glazing reduce heating demand by 20-40%.
- Install underfloor heating: Heat pumps work best with lower flow temperatures (35-45°C). Underfloor heating enables this.
- Upgrade radiators: Replace small radiators with larger low-temperature models to maintain comfort without raising thermostat.
- Switch to off-peak electricity: Tariffs like Octopus Go offer 7.5p/kWh overnight, cutting running costs by 25%.
- Add solar PV panels: Generate free electricity during the day to power your heat pump in summer and shoulder seasons.
- Install a smart thermostat: Optimises heating schedules and prevents overheating, saving 10-15% on bills.
Frequently Asked Questions
Are heat pumps worth it in the UK?
For most homes replacing oil or LPG heating, yes. For gas-heated homes, payback periods are longer (15-20+ years). Best value comes from: well-insulated properties, off-peak electricity tariffs, and high annual heating bills. Always get get at least 3 quotes from MCS-certified installers before committing.
How long do heat pumps last?
Air source heat pumps typically last 15-20 years with regular servicing. Ground source heat pumps can last 20-25 years for the ground loops, with the heat pump unit needing replacement after 15-20 years. Annual maintenance costs around GBP120-GBP150.
Do I need planning permission for a heat pump?
Most air source heat pumps fall under permitted development rights in England and Wales, meaning no planning permission is needed. Exceptions include listed buildings, conservation areas, and flats. Ground source heat pumps usually don’t need planning permission unless they require significant excavation. Always check with your local council first.
Can I run a heat pump on solar panels?
Yes. A well-designed solar PV system can offset 30-50% of your heat pump’s electricity consumption, reducing running costs significantly. Battery storage allows you to store excess solar power for evening heating. The combination of heat pump + solar PV offers the lowest carbon footprint and best long-term savings.
What size heat pump do I need?
The required heat pump size depends on your property’s heat loss, which varies by size, insulation, windows, and location. A typical 3-bed semi-detached house needs 8-12kW. An MCS-certified installer will perform a heat loss calculation during the survey to recommend the correct size. Oversized units waste energy; undersized units struggle to maintain temperature.
Does a heat pump work in very cold weather?
Air source heat pumps continue working down to -15°C to -20°C outside temperatures. However, efficiency drops as it gets colder. Some models include an electric backup heater for extreme conditions. Ground source heat pumps are unaffected by air temperature since they draw heat from the ground, which stays at 10-12°C year-round.
Can I use existing radiators with a heat pump?
Often yes, but you may need to upgrade to larger low-temperature radiators for optimal performance. Heat pumps work best at 35-45°C flow temperatures, while gas boilers operate at 60-70°C. Existing radiators may need to be oversized or supplemented with underfloor heating to maintain comfort at lower temperatures.
Who qualifies for the Boiler Upgrade Scheme grant?
You must: replace a fossil fuel heating system (gas/oil/LPG), own or lease the property, live in England or Wales, have a valid EPC, and use an MCS-certified installer. New builds and properties already heated by a heat pump do not qualify. The grant is deducted by the installer at the point of sale.