Vaillant Review UK (2026)
Quick Answer
Premium German-engineered air source heat pump, strong installer network and natural refrigerant (R290).
Data verified April 2026. UK installed pricing varies with installer, site and package.
At a Glance
| Origin | Germany (founded 1874; heat pumps since the 1970s) |
| UK support | Strong, large UK installer and service network, significant G.A.S. partnership |
| Capacity / sizing | 3.5 kW – 15 kW (aroTHERM plus range), single family to larger homes |
| SCOP | 4.5+ at 35°C flow (aroTHERM plus, A7/W35) |
| Warranty | 5 years standard; up to 10 years via accredited installer (G.A.S.) |
| Indicative UK price | £9,000–£14,000 installed before BUS grant (-£7,500) |
Strengths
- R290 natural refrigerant, lower global warming potential and aligns with upcoming F-gas regulations
- Widely installed in the UK, service and parts easy to source
- Strong control ecosystem (sensoCOMFORT, myVAILLANT app) with integrated cylinder
- Compatible with high flow-temp applications, better suited to older UK housing stock with existing radiators
Weaknesses
- More expensive than Mitsubishi or Samsung equivalents
- Noise levels slightly higher than some rivals, check sound rating for boundary conditions
- Larger footprint outdoor unit than Mitsubishi Ecodan
Who Vaillant Suits Best
Older UK homes that keep existing radiators (70°C capable with aroTHERM), or homeowners who want a long-established European brand with strong service.
When to Avoid
You need the most compact outdoor unit, or budget is the primary driver, Samsung or Mitsubishi often come in lower.
Popular Models
- aroTHERM plus VWL 35/6 A 230V
- aroTHERM plus VWL 75/6 A 230V (7.5 kW)
- aroTHERM plus VWL 125/6 A (12 kW)
Frequently Asked Questions
How much does a Vaillant heat pump cost in the UK?
Vaillant aroTHERM plus installations typically cost £9,000–£14,000 before the £7,500 Boiler Upgrade Scheme (BUS) grant. After BUS, net cost to the homeowner is usually £1,500–£6,500.
Is Vaillant eligible for the BUS grant?
Yes. Vaillant aroTHERM plus qualifies for the £7,500 Boiler Upgrade Scheme grant when installed by an MCS-certified installer in England and Wales.
What is the Vaillant G.A.S. warranty?
G.A.S. (Guild of Advanced Service) is Vaillant's accredited installer programme. G.A.S. installs receive up to 10 years warranty (vs 5 years standard) and priority service.
Can a Vaillant heat pump work with existing radiators?
Yes, within limits. The aroTHERM plus can run flow temperatures up to 75°C, suitable for many older UK radiator setups. A heat loss survey determines whether radiator upgrades are needed for efficient operation at lower flow temperatures.
Compare with Other Heat Pump Brands
| Brand | UK support | Warranty | Indicative price | |
|---|---|---|---|---|
| Daikin | Very strong, large UK office, Daikin Sustainable Home Centre, extensive installer network | 3 years standard; extendable to 7 years via accredited installer | £9,500–£14,500 installed before BUS grant | View → |
| Mitsubishi Ecodan | Very strong, largest installer base of any ASHP brand in the UK | 7 years standard on accredited installs (Mitsubishi Electric Hybrid+ programme) | £9,000–£13,500 installed before BUS grant | View → |
| NIBE | Strong, UK office plus VIP+ installer network (extended warranty programme) | 5 years standard; up to 10 years via VIP+ accredited installer | £10,000–£15,000 installed before BUS grant (air source); significantly more for ground source with boreholes | View → |
| Grant Aerona | Strong in rural UK and off-gas areas, established oil-boiler heritage and installer base | 7 years on the Aerona R290 with registration | £8,500–£13,500 installed before BUS grant (-£7,500) | View → |
| Viessmann Vitocal | Established UK office and trained installer network, strong technical support | 5 years standard; extendable via accredited installers | £9,500–£14,500 installed before BUS grant | View → |
| Panasonic Aquarea | Good UK distribution and installer network, established air conditioning heritage | 5 years standard; up to 7 via accredited installers | £8,500–£13,000 installed before BUS grant | View → |
| Samsung EHS | Growing UK installer network, established air conditioning presence | 5 years standard; up to 7 via accredited installers | £8,000–£12,500 installed before BUS grant | View → |
| LG Therma V | Growing UK network, established HVAC and air conditioning presence | 5 years standard; up to 7 via accredited installers | £8,500–£13,000 installed before BUS grant | View → |
| Aira | Direct Aira-employed installers and aftercare, not a traditional dealer network | Long warranty and performance guarantee as part of the Aira package | Upfront from around £6,500 net after grant, or a monthly subscription | View → |
| Bosch Compress | Strong, leans on the large Worcester Bosch heating installer base in the UK | Up to 7 years via accredited installers | £9,000–£14,000 installed before BUS grant | View → |
| Ideal Heating | Strong UK manufacturing base and a large existing boiler installer network | Up to 7 years via accredited installers | £8,500–£13,000 installed before BUS grant | View → |
| Midea | Growing UK distribution; Midea also manufactures units badged by other brands | 5 years standard; extendable via accredited installers | £7,500–£12,000 installed before BUS grant | View → |
Get a Quote Including Vaillant
Most MCS-certified installers carry multiple heat pump brands — ask for a quote specifying Vaillant if you want a heat pump from this brand. Use the form below to reach local installers.
Sources
John Rooney is the founder of Solar Info and has been covering the UK solar energy market since 2023. He researches every battery and inverter brand against manufacturer datasheets, MCS and Ofgem data, and feedback from the MCS-certified installers in our directory before publishing.