Vaillant aroTHERM plus — best overall
Class-leading R290 efficiency and the longest warranty of the big five — the smart default for most UK homes.
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Key specifications at a glance
| Efficiency (SCOP) | 5.03 |
| Noise level | 37–43 dB |
| Refrigerant | R290 |
| Max flow temperature | 75°C |
| Cold-weather capability | Operating down to around -20°C |
| Warranty | 7 years |
| Price after £7,500 grant | £4,500 – £9,000 |
SCOP is the seasonal efficiency figure from MCS-certified spec data. Prices are typical installed guide ranges for a 3–4 bed home after the grant.
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Our verdict on the Vaillant aroTHERM plus
The Vaillant aroTHERM plus is our best overall pick for 2026. It uses the low-GWP R290 refrigerant and tops the comparison table with a Seasonal Coefficient of Performance (SCOP) of 5.03 — among the best of any air source unit sold in the UK. In plain terms, for every 1 kWh of electricity it draws it delivers roughly 5 kWh of heat, which is exactly what keeps running costs below a gas boiler.
It pairs that efficiency with a market-leading 7-year warranty and a wide 75°C flow temperature, so it copes with older homes that can't easily run low-temperature heating. Add a 37 dB whisper-quiet outdoor unit and you have the complete package — the reason it sits at the top of our 10-brand comparison.
What sets it apart
- SCOP 5.03 — best in class, lowest running costs
- R290 refrigerant (GWP of just 3)
- 75°C flow temp suits older, less insulated homes
- 7-year warranty — the longest of the big five
- 37 dB at minimum — among the quietest units
Who it’s best for
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Vaillant aroTHERM plus FAQs
- MCS Certified — https://mcscertified.com
- Energy Saving Trust — https://energysavingtrust.org.uk
- Ofgem BUS Scheme — https://www.ofgem.gov.uk/environmental-and-social-schemes/boiler-upgrade-scheme-bus
SCOP reflects the MCS-certified manufacturer datasheet. Price is a typical installed range after the Boiler Upgrade Scheme grant and should be confirmed by a site-specific quote. Manufacturer: https://vaillant.co.uk