Grant Aerona3 Air Source Heat Pump Cost in South East England
£8,000 to £13,000 installed before the grant, or £500 to £5,500 after a £7,500 grant.
Prices are PumpSwap's indicative figures for Grant Aerona3, not quotes. Boiler Upgrade Scheme grant (£9,000 for off-gas homes on oil or LPG).
Grant, which also makes oil boilers, sells the Aerona3 R32 monobloc through its network of Grant-trained G1 installers. The 10 kW model has a certified SCOP of 5.2 at 35°C (MCS) and is rated to work down to -20°C. Off-gas homes in England and Wales replacing oil or LPG heating can get £9,000 off until 31 March 2027.
Grant Aerona3 models and running costs in South East England
Running costs for 10,000 kWh of heat a year at 26.88p per kWh (Ofgem price cap for South Eastern England, 1 October to 31 December 2026), at a 45°C design flow temperature: the midpoint of each model's MCS-certified 35°C and 55°C SCOPs.
| Model | Size | SCOP 35°C / 55°C | Installed, before grant | Running cost a year |
|---|---|---|---|---|
| Aerona3 R32 10kW rural 3-4 bed homes replacing oil | 10 kW | 5.2 / 3.47 | £8,500 to £13,000 | £620 |
Pros
- Certified SCOP of 5.2 at 35°C (MCS)
- Compact and light (70 kg)
- 7-year warranty through a G1 installer
- Rated to work down to -20°C
Cons
- High sound power (64 dB(A)), so siting matters
- Maximum flow temperature 60°C, lower than R290 units
- Standard warranty only 12 months unless registered
Best for: Off-gas homes replacing oil or LPG heating, where the £9,000 grant can apply in England and Wales. Warranty: 1 year, up to 7 with conditions.
What South East England means for your heat pump
- Climate. January averages 7.8°C by day and 1.9°C at night, with 43 days of air frost a year (Met Office 1991-2020; UK 1.2°C and 53 days). The heat loss survey sizes the unit for your local design temperature.
- Gas grid. 16% of homes here are off the gas grid (2024 estimate; Great Britain 16%). Homes on oil or LPG with no mains gas can claim £9,000 until 31 March 2027.
- Grant. Boiler Upgrade Scheme grant (£9,000 for off-gas homes on oil or LPG).
Full detail for the region, including planning rules and running costs against gas: air source heat pump cost in South East England.
Grant Aerona3 prices in towns across South East England
Other brands in South East England
Grant Aerona3 in other regions: London, South West England, East of England, East Midlands, West Midlands, Yorkshire and the Humber, North West England, North East England, Scotland, Wales, Northern Ireland.
Frequently asked questions
How much does a Grant Aerona3 heat pump cost in South East England?
£8,000 to £13,000 installed before the grant, or £500 to £5,500 after a £7,500 grant. These are PumpSwap's indicative 2026 prices; your installer's survey sets the real figure.
Can I get the grant on a Grant Aerona3 heat pump in South East England?
Yes, if your home qualifies: the Boiler Upgrade Scheme is not tied to a brand, as long as the installer is MCS-certified. It comes straight off the quote.
What would a Grant Aerona3 heat pump cost to run in South East England?
Roughly £620 a year for the Aerona3 R32 10kW to deliver 10,000 kWh of heat at 26.88p per kWh (Ofgem price cap for South Eastern England, 1 October to 31 December 2026). That assumes a 45°C design flow temperature, estimated from its MCS-certified SCOPs of 5.2 at 35°C and 3.47 at 55°C. A lower flow temperature, with bigger radiators or underfloor heating, costs less to run.
Who installs Grant Aerona3 heat pumps in South East England?
MCS-certified installers across South East England fit Grant Aerona3. Ask for a heat loss survey and compare two or three quotes on the same basis: unit size, cylinder, radiator changes and warranty.
Heat pump guides for South East England
- Air source heat pump cost in South East England
- Heat pump grants in South East England and how to claim them
- Air source heat pump installers in South East England
- Air source heat pump installation cost in the UK
- The best air source heat pumps in the UK, compared
- The £7,500 Boiler Upgrade Scheme, explained
Prices, models, efficiency and warranties are indicative and change; confirm with your MCS-certified installer. Climate: Met Office 1991-2020 averages. Energy prices: Ofgem price cap for South Eastern England, 1 October to 31 December 2026.
Where are you?
See indicative costs and local installers for your area