Vaillant aroTHERM plus Air Source Heat Pump Cost in South East England
£10,000 to £16,000 installed before the grant, or £2,500 to £8,500 after a £7,500 grant.
Prices are PumpSwap's indicative figures for Vaillant aroTHERM plus, not quotes. Boiler Upgrade Scheme grant (£9,000 for off-gas homes on oil or LPG).
Vaillant's aroTHERM plus uses natural R290 refrigerant and reaches 75°C flow. It is the most common model in heatpumpmonitor.org's public data (305 of 813 systems on 7 October 2026), where its measured median efficiency over a full year, 4.06 across 147 systems, is among the highest of any brand. A new aroTHERM plus launched in the UK in June 2026, and the /6 models shown here are being run out.
Vaillant aroTHERM plus 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 |
|---|---|---|---|---|
| aroTHERM plus 7kW 3 bed semis and well-insulated homes | 7 kW | 4.36 / 3.39 | £10,000 to £14,000 | £695 |
| aroTHERM plus 12kW large detached homes | 12 kW | 4.88 / 3.63 | £11,000 to £16,000 | £630 |
Pros
- Natural R290 refrigerant, up to 75°C flow
- Quiet Mark certified (except the 10 kW)
- Among the best measured real-world efficiency on heatpumpmonitor.org (median 4.06)
Cons
- Standard warranty is 2 years; 7 needs a Vaillant cylinder and a partner installer
- The /6 range is being replaced by a new model launched in June 2026
- The 12kW outdoor unit is tall (1,565 mm) and heavy (194 kg)
Best for: Efficiency-first buyers who want a proven, widely monitored unit. Warranty: 2 years, 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.
Vaillant aroTHERM plus prices in towns across South East England
Other brands in South East England
Vaillant aroTHERM plus 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 Vaillant aroTHERM plus heat pump cost in South East England?
£10,000 to £16,000 installed before the grant, or £2,500 to £8,500 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 Vaillant aroTHERM plus 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 Vaillant aroTHERM plus heat pump cost to run in South East England?
Roughly £630 a year for the aroTHERM plus 12kW 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 4.88 at 35°C and 3.63 at 55°C. A lower flow temperature, with bigger radiators or underfloor heating, costs less to run.
Who installs Vaillant aroTHERM plus heat pumps in South East England?
MCS-certified installers across South East England fit Vaillant aroTHERM plus. 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