Vaillant aroTHERM plus Air Source Heat Pump
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 air source heat pump price UK (2026)
The Boiler Upgrade Scheme takes £7,500 off in England and Wales (£9,000 for off-gas homes replacing oil or LPG heating, until 31 March 2027); your MCS-certified installer claims it for you. Scotland uses the Home Energy Scotland grant and loan instead; Northern Ireland has no equivalent. 0% VAT until 31 March 2027 is already reflected. Smallest model: aroTHERM plus 7kW from £10,000 pre-grant. Largest: aroTHERM plus 12kW up to £16,000. Running cost estimated at ~10,000 kWh of heat a year and 26.32p/kWh electricity (October to December 2026 cap). Accurate as at October 2026.
Warranty: 2 years as standard; up to 7 years with a Vaillant cylinder through a Platinum, Renewable Partner or myREWARDS installer. Register within 30 days and service annually.SCOP is the MCS-certified seasonal efficiency; sound power is the maker's declared ErP figure, the like-for-like noise measure (what you hear next door depends on distance and siting). Prices are indicative; confirm with your MCS-certified installer.
Available Models
aroTHERM plus 7kW
aroTHERM plus 12kW
Specifications from the makers' datasheets and the MCS product directory, checked October 2026; prices are indicative. Running costs: Estimate for 10,000 kWh of heat a year at 26.32p per kWh (Ofgem price cap, October to December 2026), at a 45°C design flow temperature: the midpoint of the certified 35°C and 55°C SCOPs. Post-grant figures illustrate the £7,500 Boiler Upgrade Scheme in England and Wales. Confirm current models and exact pricing with your MCS-certified installer.
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
Vaillant aroTHERM plus pricing and grants in your region
The hardware is the same everywhere; the support is not. England and Wales use the £7,500 Boiler Upgrade Scheme, Scotland the Home Energy Scotland grant and loan, and Northern Ireland currently has no grant. Each regional guide covers exactly what applies.
Vaillant aroTHERM plus air source heat pump FAQ
How much is a Vaillant aroTHERM plus air source heat pump installed in the UK (2026)?
A Vaillant aroTHERM plus air source heat pump costs £10,000 - £16,000 fully installed in the UK before any support (indicative, June 2026, with 0% VAT already applied). After the £7,500 Boiler Upgrade Scheme grant in England and Wales, that is illustratively £2,500 - £8,500 out of pocket. The smallest model (aroTHERM plus 7kW) starts around £10,000 pre-grant; the largest (aroTHERM plus 12kW) tops out around £16,000. Combi-to-cylinder conversions and radiator upgrades add to these figures, so always confirm with a written quote.
Is a Vaillant aroTHERM plus heat pump eligible for the £7,500 grant?
Yes. Every air-to-water unit on this page qualifies for the Boiler Upgrade Scheme in England and Wales when it is fitted by an MCS-certified installer, who applies for the grant on your behalf so it comes straight off the quote. Off-gas homes replacing oil or LPG heating can claim £9,000 instead, until 31 March 2027. Scotland uses the Home Energy Scotland grant and loan instead; Northern Ireland currently has no equivalent scheme. Grant details accurate as at October 2026.
Is Vaillant aroTHERM plus a good air source heat pump brand?
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 is best suited to efficiency-first buyers who want a proven, widely monitored unit.
What is the warranty on a Vaillant aroTHERM plus heat pump?
2 years as standard; up to 7 years with a Vaillant cylinder through a Platinum, Renewable Partner or myREWARDS installer. Register within 30 days and service annually. Workmanship cover for the installation itself comes separately from your installer. Most extended terms depend on registering the product and annual servicing, so keep your installation paperwork and MCS certificate.
How efficient is a Vaillant aroTHERM plus air source heat pump?
The aroTHERM plus 7kW has an MCS-certified SCOP (seasonal coefficient of performance) of 4.36 at 35°C flow and 3.39 at 55°C, so over a heating season each 1 kWh of electricity delivers about 3.39 to 4.36 kWh of heat, depending on how hot your system runs. At a 45°C design flow and the Ofgem cap rate (26.32p/kWh), 10,000 kWh of heat costs an estimated £680 a year, against roughly £890 for a 90%-efficient gas boiler at the current cap gas rate (7.97p/kWh from 1 October 2026). Estimates, not quotes; heat pump time-of-use tariffs can do better.
How long does a Vaillant aroTHERM plus heat pump last?
With an annual service, heat pumps are generally expected to run well beyond their warranty period (Vaillant aroTHERM plus: 2 years, up to 7 with conditions). Longevity depends on correct sizing (the MCS heat-loss survey), sensible siting and regular servicing. Confirm design life and extended-warranty options for your specific model with your MCS-certified installer.
Vaillant aroTHERM plus vs other brands: which should I pick?
Vaillant aroTHERM plus sits at the premium end of the UK market on pre-grant pricing. It is the most common model in heatpumpmonitor.org's public data, with among the best measured real-world efficiency there (median 4.06 over a year). See the side-by-side comparisons below for direct head-to-head specs.
Vaillant aroTHERM plus vs other heat pump brands
Heat pump guides
- 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
- Air source heat pumps: costs, grants and brands
- Heat pump grants in London
- Heat pump grants in South East England
- Heat pump grants in South West England
- Heat pump grants in East of England
- Heat pump grants in East Midlands
- Heat pump grants in West Midlands
- Heat pump grants in Yorkshire and the Humber
- Heat pump grants in North West England
- Heat pump grants in North East England
- Heat pump grants in Scotland
- Heat pump grants in Wales
- Heat pump grants in Northern Ireland
Other heat pump brands
Where are you?
See indicative costs and local installers for your area