Best air source heat pumps (2026)
998 models in our database meet this; below the first 25 in order.
Criteria:
- Type (source): Air-to-water
- Ranking: data score with these weights: SCOP (35 °C) 30 % · SCOP (55 °C) 25 % · Outdoor unit sound power 25 % · Refrigerant GWP 20 %
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
Image: Kermirequest removal Kermi x-change dynamic pro S
Data score 90/100
- SCOP (35 °C) 5.68: no. 8 of 998 models
- SCOP (55 °C) 4.23: no. 8 of 991 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
Image: Kermirequest removal Kermi x-change dynamic pro M
Data score 89/100
- SCOP (55 °C) 4.33: no. 4 of 991 models
- SCOP (35 °C) 5.7: no. 6 of 998 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
M-TEC AHPA413
Data score 89/100
- SCOP (55 °C) 4.3: no. 5 of 991 models
- SCOP (35 °C) 5.5: no. 23 of 998 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
Image: Boschrequest removal Bosch CS8800iAW 11 O-T
Data score 89/100
- SCOP (35 °C) 5.4: no. 35 of 998 models
- SCOP (55 °C) 4.12: no. 27 of 991 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
Image: Buderusrequest removal Buderus WLW-11 MBE+ AR
Data score 89/100
- SCOP (35 °C) 5.4: no. 35 of 998 models
- SCOP (55 °C) 4.12: no. 27 of 991 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
Image: Buderusrequest removal Buderus WLW186i-11 MBE+ AR E
Data score 89/100
- SCOP (35 °C) 5.4: no. 35 of 998 models
- SCOP (55 °C) 4.12: no. 27 of 991 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
Image: Boschrequest removal Bosch CS8800iAW 13 O-T
Data score 89/100
- SCOP (55 °C) 4.13: no. 25 of 991 models
- SCOP (35 °C) 5.37: no. 46 of 998 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
Image: Buderusrequest removal Buderus WLW186i-13 MBE+ AR E
Data score 89/100
- SCOP (55 °C) 4.13: no. 25 of 991 models
- SCOP (35 °C) 5.37: no. 46 of 998 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
SOLVIS SolvisLea 5 Pro
Data score 89/100
- SCOP (55 °C) 4.08: no. 43 of 991 models
- SCOP (35 °C) 5.35: no. 49 of 998 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
STIEBEL ELTRON WPL-A 05.2 Plus HK 230
Data score 89/100
- SCOP (55 °C) 4.08: no. 43 of 991 models
- SCOP (35 °C) 5.35: no. 49 of 998 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
Image: Tecalorrequest removal Tecalor TTL 5.1 ACS comfort
Data score 89/100
- SCOP (55 °C) 4.08: no. 43 of 991 models
- SCOP (35 °C) 5.35: no. 49 of 998 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
Image: Buderusrequest removal Buderus WLW-13 MBE+ AR
Data score 88/100
- SCOP (55 °C) 4.12: no. 27 of 991 models
- SCOP (35 °C) 5.37: no. 46 of 998 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
ACOND Grandis R
Data score 88/100
- SCOP (55 °C) 4.2: no. 10 of 991 models
- SCOP (35 °C) 5.58: no. 18 of 998 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
ACOND Grandis N
Data score 87/100
- SCOP (35 °C) 5.38: no. 41 of 998 models
- SCOP (55 °C) 4.05: no. 52 of 991 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
Clivet WiSAN-PMP 1 S 4.1
Data score 87/100
- SCOP (55 °C) 4.08: no. 43 of 991 models
- SCOP (35 °C) 5.35: no. 49 of 998 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
M-TEC AHPA412
Data score 87/100
- SCOP (55 °C) 4.03: no. 60 of 991 models
- SCOP (35 °C) 5.25: no. 86 of 998 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
Hargassner AirPro 515
Data score 86/100
- Outdoor unit sound power 41 dB(A): no. 37 of 998 models
- SCOP (55 °C) 3.98: no. 102 of 991 models
Choose this model if the outdoor unit will sit close to neighbours, a patio or a bedroom.
ACOND Grandis-L16
Data score 86/100
- SCOP (35 °C) 5.49: no. 26 of 998 models
- SCOP (55 °C) 4.03: no. 60 of 991 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
Image: TEMPLARIrequest removal TEMPLARI Unità esterna KITA-SP-10, 1Ph, vers. MONOBLOCCO R-290
Data score 86/100
- SCOP (35 °C) 5.75: no. 4 of 998 models
- SCOP (55 °C) 4.2: no. 10 of 991 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
Clivet WiSAN-PMP 1 S 5.1T
Data score 86/100
- SCOP (35 °C) 5.33: no. 62 of 998 models
- SCOP (55 °C) 4.03: no. 60 of 991 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
Solar Solutions Indoor unit AS-RHP07-I1-C01 and outdoor unit AS-RHP07-O3-8K
Data score 86/100
- SCOP (35 °C) 5.44: no. 30 of 998 models
- SCOP (55 °C) 4.12: no. 27 of 991 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
SOLARFOCUS vampair ECO 12/3
Data score 86/100
- SCOP (35 °C) 5.62: no. 10 of 998 models
- SCOP (55 °C) 4.15: no. 20 of 991 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
Image: Kermirequest removal Kermi x-change dynamic eco S
Data score 85/100
- SCOP (35 °C) 5.35: no. 49 of 998 models
- SCOP (55 °C) 4.03: no. 60 of 991 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
Image: TCLrequest removal TCL THM4DFB
Data score 85/100
- SCOP (55 °C) 4.38: joint best of 991 models
- SCOP (35 °C) 5.8: no. 3 of 998 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
Image: TEMPLARIrequest removal TEMPLARI Unità esterna KITA-SP-8, 1Ph, vers. MONOBLOCCO R-290
Data score 85/100
- SCOP (35 °C) 5.61: no. 15 of 998 models
- SCOP (55 °C) 4.1: no. 40 of 991 models
Choose this model if you have underfloor heating and want to use as little electricity as possible.
All figures at a glance
| # | Model1,2,3,4 | Data score | Rated output 35 °C | SCOP (35 °C) | SCOP (55 °C) | Outdoor unit sound power | Refrigerant |
|---|---|---|---|---|---|---|---|
| 1 | Kermi x-change dynamic pro S | 90 | 7 kW | 5.68 | 4.23 | 45 dB(A) | R290 |
| 2 | Kermi x-change dynamic pro M | 89 | 10 kW | 5.7 | 4.33 | 47 dB(A) | R290 |
| 3 | M-TEC AHPA413 | 89 | 10.67 kW | 5.5 | 4.3 | 46 dB(A) | R290 |
| 4 | Bosch CS8800iAW 11 O-T | 89 | 11 kW | 5.4 | 4.12 | 45 dB(A) | R290 |
| 5 | Buderus WLW-11 MBE+ AR | 89 | 11 kW | 5.4 | 4.12 | 45 dB(A) | R290 |
| 6 | Buderus WLW186i-11 MBE+ AR E | 89 | 11 kW | 5.4 | 4.12 | 45 dB(A) | R290 |
| 7 | Bosch CS8800iAW 13 O-T | 89 | 13 kW | 5.37 | 4.13 | 45 dB(A) | R290 |
| 8 | Buderus WLW186i-13 MBE+ AR E | 89 | 13 kW | 5.37 | 4.13 | 45 dB(A) | R290 |
| 9 | SOLVIS SolvisLea 5 Pro | 89 | 6 kW | 5.35 | 4.08 | 43 dB(A) | R290 |
| 10 | STIEBEL ELTRON WPL-A 05.2 Plus HK 230 | 89 | 6 kW | 5.35 | 4.08 | 43 dB(A) | R290 |
| 11 | Tecalor TTL 5.1 ACS comfort | 89 | 6 kW | 5.35 | 4.08 | 43 dB(A) | R290 |
| 12 | Buderus WLW-13 MBE+ AR | 88 | 13 kW | 5.37 | 4.12 | 45 dB(A) | R290 |
| 13 | ACOND Grandis R | 88 | 10 kW | 5.58 | 4.2 | 48 dB(A) | R290 |
| 14 | ACOND Grandis N | 87 | 4 kW | 5.38 | 4.05 | 46 dB(A) | R290 |
| 15 | Clivet WiSAN-PMP 1 S 4.1 | 87 | 8 kW | 5.35 | 4.08 | 47 dB(A) | R290 |
| 16 | M-TEC AHPA412 | 87 | 9.4 kW | 5.25 | 4.03 | 44 dB(A) | R290 |
| 17 | Hargassner AirPro 515 | 86 | 15 kW | 5.2 | 3.98 | 41 dB(A) | R290 |
| 18 | ACOND Grandis-L16 | 86 | 15.5 kW | 5.49 | 4.03 | 48 dB(A) | R290 |
| 19 | TEMPLARI Unità esterna KITA-SP-10, 1Ph, vers. MONOBLOCCO R-290 | 86 | 8.34 kW | 5.75 | 4.2 | 50 dB(A) | R290 |
| 20 | Clivet WiSAN-PMP 1 S 5.1T | 86 | 10 kW | 5.33 | 4.03 | 47 dB(A) | R290 |
| 21 | Solar Solutions Indoor unit AS-RHP07-I1-C01 and outdoor unit AS-RHP07-O3-8K | 86 | 8 kW | 5.44 | 4.12 | 49 dB(A) | R290 |
| 22 | SOLARFOCUS vampair ECO 12/3 | 86 | 10 kW | 5.62 | 4.15 | 50 dB(A) | R290 |
| 23 | Kermi x-change dynamic eco S | 85 | 6 kW | 5.35 | 4.03 | 48 dB(A) | R290 |
| 24 | TCL THM4DFB | 85 | 5 kW | 5.8 | 4.38 | 51 dB(A) | R290 |
| 25 | TEMPLARI Unità esterna KITA-SP-8, 1Ph, vers. MONOBLOCCO R-290 | 85 | 6.53 kW | 5.61 | 4.1 | 50 dB(A) | R290 |
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 data score from 0 to 100. For each feature we determine a model’s position relative to the other models in this selection: the best value counts as 100, the weakest as 0, and equal values share the same position. We add up those positions with weights: SCOP (35 °C) 30 % · SCOP (55 °C) 25 % · Outdoor unit sound power 25 % · Refrigerant GWP 20 %. A feature that is unknown for a model does not count; if more than 40 per cent of the weight is missing, the model is left out. If two scores are equal, SCOP (35 °C) decides.
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 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
- Quietest 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
- List of eligible heat pumps (BEG) — Bundesamt für Wirtschaft und Ausfuhrkontrolle (BAFA) · accessed 27 Sept 2026
- ISDE heat pump notification code list — Rijksdienst voor Ondernemend Nederland (RVO) · accessed 28 Sept 2026
- Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed 29 Sept 2026