Quietest air source heat pumps (2026)
998 models in our database meet this; below the first 25 in order.
Criteria:
- Type (source): Air-to-water
- Sorted by: Outdoor unit sound power (lowest first)
Air-to-water heat pumps only: ground-source and water-to-water heat pumps reach a higher SCOP thanks to their warmer source, so they cannot be compared fairly with air-to-water units. They have their own selections.
A ranking based on manufacturer and register data, not a test: we have not measured the units ourselves, and price, installation and service are not included. The source of every value is on the product page.
The ranking
STIEBEL ELTRON WPL 09 ICS classic
Outdoor unit sound power 32 dB(A)
- Outdoor unit sound power 32 dB(A): joint best of 998 models
- Weaker point: SCOP (55 °C) 3.33: no. 847 of 991 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
STIEBEL ELTRON WPL 09 IKCS classic
Outdoor unit sound power 32 dB(A)
- Outdoor unit sound power 32 dB(A): joint best of 998 models
- Weaker point: SCOP (55 °C) 3.28: no. 893 of 991 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Tecalor TTL 4.5 ICS
Outdoor unit sound power 32 dB(A)
- Outdoor unit sound power 32 dB(A): joint best of 998 models
- Weaker point: SCOP (55 °C) 3.33: no. 847 of 991 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Tecalor TTL 4.5 IKCS
Outdoor unit sound power 32 dB(A)
- Outdoor unit sound power 32 dB(A): joint best of 998 models
- Weaker point: SCOP (55 °C) 3.28: no. 893 of 991 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Image: Boschrequest removal Bosch Compress 7000i AW CS7000iAW 7 IRB-S
Outdoor unit sound power 36 dB(A)
- Outdoor unit sound power 36 dB(A): no. 5 of 998 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Image: Boschrequest removal Bosch Compress 7000i AW CS7000iAW 7 IRMB-S
Outdoor unit sound power 36 dB(A)
- Outdoor unit sound power 36 dB(A): no. 5 of 998 models
- Weaker point: SCOP (35 °C) 4.41: no. 897 of 998 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Image: Boschrequest removal Bosch Compress 7000i AW CS7000iAW 9 IRB-S
Outdoor unit sound power 36 dB(A)
- Outdoor unit sound power 36 dB(A): no. 5 of 998 models
- Weaker point: SCOP (35 °C) 4.48: no. 838 of 998 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Image: Boschrequest removal Bosch Compress 7000i AW CS7000iAW 9 IRMB
Outdoor unit sound power 36 dB(A)
- Outdoor unit sound power 36 dB(A): no. 5 of 998 models
- Weaker point: SCOP (35 °C) 4.27: no. 941 of 998 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Image: Buderusrequest removal Buderus Logatherm WLW196i-6 IRB
Outdoor unit sound power 36 dB(A)
- Outdoor unit sound power 36 dB(A): no. 5 of 998 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Image: Buderusrequest removal Buderus Logatherm WLW196i-6 IRTP120
Outdoor unit sound power 36 dB(A)
- Outdoor unit sound power 36 dB(A): no. 5 of 998 models
- Weaker point: SCOP (35 °C) 4.41: no. 897 of 998 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Image: Buderusrequest removal Buderus Logatherm WLW196i-8 IRB
Outdoor unit sound power 36 dB(A)
- Outdoor unit sound power 36 dB(A): no. 5 of 998 models
- Weaker point: SCOP (35 °C) 4.48: no. 838 of 998 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Image: Buderusrequest removal Buderus Logatherm WLW196i-8 IRTP120
Outdoor unit sound power 36 dB(A)
- Outdoor unit sound power 36 dB(A): no. 5 of 998 models
- Weaker point: SCOP (35 °C) 4.27: no. 941 of 998 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Image: Boschrequest removal Bosch Compress 7000i AW CS7000iAW 13 IRB-T
Outdoor unit sound power 37 dB(A)
- Outdoor unit sound power 37 dB(A): no. 13 of 998 models
- Weaker point: SCOP (35 °C) 4.52: no. 820 of 998 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Image: Boschrequest removal Bosch Compress 7000i AW CS7000iAW 13 IRMB-T
Outdoor unit sound power 37 dB(A)
- Outdoor unit sound power 37 dB(A): no. 13 of 998 models
- Weaker point: SCOP (35 °C) 4.32: no. 920 of 998 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Image: Boschrequest removal Bosch Compress 7000i AW CS7000iAW 17 IRB-T
Outdoor unit sound power 37 dB(A)
- Outdoor unit sound power 37 dB(A): no. 13 of 998 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Image: Boschrequest removal Bosch Compress 7000i AW CS7000iAW 17 IRMB-T
Outdoor unit sound power 37 dB(A)
- Outdoor unit sound power 37 dB(A): no. 13 of 998 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Image: Buderusrequest removal Buderus Logatherm WLW196i-11 IRB
Outdoor unit sound power 37 dB(A)
- Outdoor unit sound power 37 dB(A): no. 13 of 998 models
- Weaker point: SCOP (35 °C) 4.52: no. 820 of 998 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Image: Buderusrequest removal Buderus Logatherm WLW196i-11 IRTP120
Outdoor unit sound power 37 dB(A)
- Outdoor unit sound power 37 dB(A): no. 13 of 998 models
- Weaker point: SCOP (35 °C) 4.32: no. 920 of 998 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Image: Buderusrequest removal Buderus Logatherm WLW196i-14 IRB
Outdoor unit sound power 37 dB(A)
- Outdoor unit sound power 37 dB(A): no. 13 of 998 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Image: Buderusrequest removal Buderus Logatherm WLW196i-14 IRTP120
Outdoor unit sound power 37 dB(A)
- Outdoor unit sound power 37 dB(A): no. 13 of 998 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Hargassner AirPro 207
Outdoor unit sound power 39 dB(A)
- Outdoor unit sound power 39 dB(A): no. 21 of 998 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Image: Boschrequest removal Bosch Compress 5800i AW CS5800iAW 4 OR210 MP-S
Outdoor unit sound power 40 dB(A)
- Outdoor unit sound power 40 dB(A): no. 22 of 998 models
- Weaker point: SCOP (55 °C) 3.09: no. 986 of 991 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Image: Boschrequest removal Bosch Compress 5800i AW CS5800iAW 4 ORE-S
Outdoor unit sound power 40 dB(A)
- Outdoor unit sound power 40 dB(A): no. 22 of 998 models
- Weaker point: SCOP (55 °C) 3.32: no. 865 of 991 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Image: Boschrequest removal Bosch Compress 5800i AW CS5800iAW 4 ORM-S
Outdoor unit sound power 40 dB(A)
- Outdoor unit sound power 40 dB(A): no. 22 of 998 models
- Weaker point: SCOP (55 °C) 3.25: no. 923 of 991 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
Image: Boschrequest removal Bosch Compress 5800i AW CS5800iAW 4 ORMB-S
Outdoor unit sound power 40 dB(A)
- Outdoor unit sound power 40 dB(A): no. 22 of 998 models
- Weaker point: SCOP (55 °C) 3.27: no. 917 of 991 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
All figures at a glance
How this ranking is made
This selection is put together automatically from the 998 models in our database that meet the criteria above. We only include models whose figures for the ranking are known: without those values a model cannot be compared fairly, so it drops out. The list is recalculated with every data update, so the order can change as soon as manufacturers or registers publish new values.
The order follows a single feature: Outdoor unit sound power (lowest first). Where values are equal, the alphabetical order of brand and model decides. The other features are shown as extra columns in the table so you can see how a model does on other points; a model at the top for this one feature can be weaker elsewhere.
The reasoning for each place is derived automatically from the same data. We name the features on which the model is in the best quarter of this selection, functions that not every model has, and a weaker point if the model falls in the bottom quarter on it. The line ‘Choose this model if …’ links the most heavily weighted strength to a situation where it matters. This is not a test and not personal advice: the installation, your home and the price also decide what works best for you.
The values come from EPREL, Keymark and manufacturers; the product page shows the source of every value. How we collect and check the data →
More selections
- Quietest 4–6 kW air-to-water heat pumps
- Most efficient 4–6 kW air-to-water heat pumps
- Quietest 6–8 kW air-to-water heat pumps
- Most efficient 6–8 kW air-to-water heat pumps
- Quietest 8–10 kW air-to-water heat pumps
- Most efficient 8–10 kW air-to-water heat pumps
- Quietest 10–14 kW air-to-water heat pumps
- Most efficient 10–14 kW air-to-water heat pumps
- Best air source heat pumps
- Best 4–6 kW air source heat pumps
- Best 6–8 kW air source heat pumps
- Best 8–12 kW air source heat pumps
- Best 12–16 kW air source heat pumps
- Heat pumps with R290 (propane)
- Most efficient heat pumps for radiators (55 °C)
- Air-to-water heat pumps
- Ground-source heat pumps (brine-to-water)
- Water-to-water heat pumps (groundwater)
- Best hybrid heat pumps (with a gas boiler)
Sources
- European Product Registry for Energy Labelling (EPREL) – heat pumps — Europese Commissie · accessed 15 Oct 2026
- Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed 29 Sept 2026