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Vaillant vs Daikin heat pumps
Two of the most quoted brands in UK homes, compared on what actually differs.
Vaillant’s aroTHERM plus uses R290 propane refrigerant and reaches higher flow temperatures, which suits retrofits keeping existing radiators, while Daikin’s Altherma 3 typically quotes lower and has one of the largest MCS installer networks in the UK. Installed prices sit around £9,500–£13,500 for Vaillant and £8,800–£12,500 for Daikin in 2026.
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Where Vaillant wins
- R290 refrigerant with very low global warming potential.
- Higher achievable flow temperature, helpful when keeping existing radiators.
- Low published sound levels, useful for tight urban boundaries.
- Long warranty when registered with an approved installer.
Where Daikin wins
- Usually the lower quote for an equivalent output.
- Very wide MCS installer coverage, so more competing quotes.
- Mature controls and app ecosystem.
- Broad model range including monobloc and split configurations.
How to choose
If your radiators are staying and the design flow temperature is 50°C or above, the Vaillant’s high-temperature capability earns its premium. If you are upsizing emitters and designing at 40–45°C, the Daikin usually delivers the same comfort for less money.
In both cases the installer’s design quality matters more than the badge. A well-designed Daikin beats a poorly designed Vaillant every time.
Frequently asked questions
- Is Vaillant better than Daikin?
- Vaillant leads on refrigerant type and high flow temperature capability; Daikin leads on price and installer availability. The right choice depends on whether your radiators are being upsized.
- Which is cheaper to install?
- Daikin typically quotes £500–£1,500 lower for an equivalent output in the UK market.
- Do both qualify for the £7,500 grant?
- Yes, both are MCS-listed air source products eligible under the Boiler Upgrade Scheme when fitted by an MCS-certified installer.
- MCS Certified — Installer certification scheme required for grant eligibility.
- Energy Saving Trust — Heat pump efficiency, running cost and SCOP benchmarks (UK).
- Boiler Upgrade Scheme — GOV.UK — Official guidance on the £7,500 BUS grant in England and Wales.
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