Quietest Air Source Heat Pumps (2026)
Top 10 of 1457 qualifying products · updated 2026-10-13
Ranked by published sound power level (dB(A)) — lowest first. Limited to units up to 25 kW with a declared sound power figure, the measure used for UK permitted-development noise assessments (MCS 020).
Every figure comes from the manufacturer’s published specification as recorded in the Heat Pump Database; near-identical variants (e.g. single- and three-phase versions with the same result) are shown once. The list updates automatically as new products are added.
| # | Model | Capacity | Sound power dB(A) | Refrigerant |
|---|---|---|---|---|
| 1 |  Viessmann Vitocal 200-A | 3.2–5.7 kW | 35 | R410A |
| 2 | Viessmann Vitocal 222-A | 2.4–4.2 kW | 35 | R410A |
| 3 |  Kronoterm VERSI-I 1F | 6.5 kW | 36 | R452B |
| 4 | Kronoterm VERSI-I 3F (400V) | 6.5 kW | 36 | R452B |
| 5 | Kronoterm VERSI-X 1F | 6.5 kW | 36 | R452B |
| 6 |  Heliotherm COMPLETE Air Split Heat Pump | 2–7 kW | 37 | R-410A |
| 7 | Heliotherm CUBE Air Split Heat Pump | 7 kW | 37 | R-410A |
| 8 | Kronoterm ADAPT 2 L | 4.5–18 kW | 38 | R290 |
| 9 |  Bosch Compress 5800i AW 4 | 4 kW | 40 | R290 |
| 10 | Heliotherm Air Heat Pump Split Design | 2.4–10.3 kW | 40 | Not stated |