Review · Brand
Vaillant aroTHERM plus review
The premium German monobloc that became the UK's most-installed heat pump. Strengths, weaknesses and what to pay.
The Vaillant aroTHERM plus is a propane (R290) monobloc that flow-temperatures up to 75°C, with a tested SCOP of 4.7 (5 kW unit, 35°C flow). UK install cost £10,500–£14,500, dropping to £3,000–£7,000 after the £7,500 BUS grant. Warranty is 7 years with annual servicing.
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What's good
- R290 refrigerant — best-in-class efficiency and futureproof against F-gas phasedown.
- 75°C flow capability means fewer radiator changes in retrofit.
- 32–36 dB(A) at 3m — quietest in its class.
- Strong UK installer network — easy to service.
What to watch
- £800–£1,500 premium over Daikin or Samsung equivalents.
- R290 is flammable — requires 1m clearance from openings, which can be tight on terraced plots.
- sensoCOMFORT controller is functional but the app is dated vs Daikin Onecta.
Verdict
The aroTHERM plus is the safe premium pick for a UK retrofit. If your installer recommends it and the quote is within £1,000 of a cheaper brand, take it.
Frequently asked questions
- How much does a Vaillant aroTHERM plus cost installed?
- A 7–12 kW aroTHERM plus installs at £10,500–£14,500 in the UK in 2026, slightly above mid-market brands. The £7,500 BUS grant brings the net to £3,000–£7,000.
- Is the aroTHERM plus quiet?
- Yes — 32 dB(A) at 3m on the 5 kW model and 36 dB on the 12 kW, comfortably below MCS 020's 42 dB neighbour limit.
- MCS Certified — Installer certification scheme required for grant eligibility.
- Energy Saving Trust — Heat pump efficiency, running cost and SCOP benchmarks (UK).
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