Daikin Altherma 3 H HT
The Daikin Altherma 3 H HT is the efficiency leader with SCOP up to 5.43 — the highest of any air source heat pump widely available in the UK. A+++ rated, it reaches 70°C flow temperature (suitable for existing radiator systems without upsizing) at just 38 dB, making it one of the quietest units available. The premium price is justified by the lowest running costs and longest track record. Best for: larger detached properties, heritage homes needing high flow temperatures, and noise-sensitive installations.
Vaillant aroTHERM Plus
The Vaillant aroTHERM Plus uses R290 natural refrigerant (propane) with near-zero global warming potential. Quiet Mark certified with SCOP of 3.5-5.0+, it reaches 75°C flow temperature — the highest of any residential ASHP. The integrated hydraulic station simplifies installation. Best for: environmentally conscious homeowners, properties needing very high flow temperatures, and urban installations where noise is critical.
Samsung EHS Mono
The Samsung EHS Mono delivers SCOP of 3.5-4.8 in one of the most compact units on the market. It offers excellent value for money, making it the budget-conscious choice without sacrificing performance. The moderate noise level suits most suburban installations. Best for: cost-effective installations, smaller properties, and customers who want solid performance at a competitive price point.
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