Quietest Air Source Heat Pumps
Top 20 of 835 qualifying products · updated 2026-07-29
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).
| # | 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 |
| 11 | Heliotherm Air Heat Pump Split Design | 4.1–12.2 kW | 41 | Not stated |
| 12 | Kronoterm ADAPT 2 M 1F | 3.5–13 kW | 41 | R290 |
| 13 | Bosch Compress 5800i AW 5 | 6 kW | 42 | R290 |
| 14 | Stiebel Eltron HPA-O 07.2 Plus HC 230V | 7.09 kW | 43 | R290 |
| 15 | Heliotherm Air Heat Pump Split Design | 5.1–19.1 kW | 43 | Not stated |
| 16 | Kronoterm VERSI-O 1F | 6.4 kW | 43 | R452B |
| 17 | Stiebel Eltron HPA-O 05.2 Trend HC 230V | 4.91 kW | 44 | R290 |
| 18 | Stiebel Eltron HPA-O 07.2 Trend HC 230V | 6.92 kW | 44 | R290 |
| 19 | M-Tec AHPA412 | 4–12 kW | 44 | R290 |
| 20 | Ochsner GMLW | 10.2 kW | 44.5 | R407C |
Rankings are generated automatically from manufacturer-published data in the Heat Pump Database and refresh as new products are added. Figures come from different manufacturers’ datasheets and certification documents; always confirm specifications with the manufacturer. Products without the relevant published figure are excluded.