Vaillant aroTHERM plus Air Source Heat Pump Cost in Northern Ireland
£10,000 to £16,000 installed in Northern Ireland, where there is no heat pump grant; 0% VAT applies until 31 March 2027.
Prices are PumpSwap's indicative figures for Vaillant aroTHERM plus, not quotes. No heat pump grant in Northern Ireland.
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 Northern Ireland
Running costs for 10,000 kWh of heat a year at 34.15p per kWh (Power NI standard tariff including VAT, from 1 July 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 | 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 | £880 |
| aroTHERM plus 12kW large detached homes | 12 kW | 4.88 / 3.63 | £11,000 to £16,000 | £800 |
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 Northern Ireland means for your heat pump
- Climate. January averages 7.2°C by day and 1.7°C at night, with 41 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.
- Heating fuel. 49.5% of Northern Ireland households heat with oil alone, against 31.58% on mains gas alone.
- Grant. No heat pump grant in Northern Ireland.
Full detail for the region, including planning rules and running costs against gas: air source heat pump cost in Northern Ireland.
Vaillant aroTHERM plus prices in towns across Northern Ireland
Other brands in Northern Ireland
Vaillant aroTHERM plus in other regions: London, South East England, South West England, East of England, East Midlands, West Midlands, Yorkshire and the Humber, North West England, North East England, Scotland, Wales.
Frequently asked questions
How much does a Vaillant aroTHERM plus heat pump cost in Northern Ireland?
£10,000 to £16,000 installed. There is no heat pump grant in Northern Ireland, so that is what you pay; 0% VAT applies until 31 March 2027. These are PumpSwap's indicative 2026 prices.
Can I get the grant on a Vaillant aroTHERM plus heat pump in Northern Ireland?
There is no heat pump grant for homeowners in Northern Ireland, whichever brand you choose. The 0% VAT relief on the installation still applies.
What would a Vaillant aroTHERM plus heat pump cost to run in Northern Ireland?
Roughly £800 a year for the aroTHERM plus 12kW to deliver 10,000 kWh of heat at 34.15p per kWh (Power NI standard tariff including VAT, from 1 July 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 Northern Ireland?
MCS-certified installers across Northern Ireland 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 Northern Ireland
Prices, models, efficiency and warranties are indicative and change; confirm with your MCS-certified installer. Climate: Met Office 1991-2020 averages. Energy prices: Power NI standard tariff including VAT, from 1 July 2026.
Where are you?
See indicative costs and local installers for your area