Fleet benchmark
139 heat-metered homes, one honest distribution
Seeded from HeatpumpMonitor.org public systems on 2026-09-16, licence CC BY 4.0. This fleet is self-selected enthusiasts with good installers, so the wider market is worse than this.
Full-year efficiency, last 365 days
January 2026 only
By manufacturer
| Brand | Homes | Median full-year COP |
|---|---|---|
| Vaillant | 48 | 4.06 |
| Daikin | 17 | 3.16 |
| Viessmann | 15 | 3.44 |
| Grant | 13 | 4.10 |
| Mitsubishi | 10 | 3.75 |
| Nibe | 6 | 3.86 |
| Samsung | 6 | 4.25 |
| Stiebel Eltron | 5 | 5.16 |
Brand medians mix installer quality with hardware; they are not a product ranking.
All systems
| System | Brand · model | Location | Rated kW | Emitters | Full-year COP | |
|---|---|---|---|---|---|---|
| #204 | Stiebel Eltron WPE-I 12 H | Caersws, Mid Wales | 12 | underfloor | 6.01 | analyse |
| #1363 | Adlar Aurora II | Chertsey, Surrey | 6 | radiators | 5.74 | analyse |
| #1239 | Stiebel Eltron HPA-7 Plus | Llanidan, Anglesey | 7.2 | radiators | 5.32 | analyse |
| #479 | Vaillant Arotherm+ | Rowledge Surrey | 10 | underfloor | 5.26 | analyse |
| #533 | Stiebel Eltron WPL Premium | York, North Yorkshire | 7 | radiators | 5.16 | analyse |
| #568 | Vaillant Arotherm+ | Co Antrim - Northern Ireland | 10 | underfloor | 5.16 | analyse |
| #1380 | Nibe S2060 | Alesbury, Buckinghamshire | 10 | radiators | 5.04 | analyse |
| #424 | Vaillant Arotherm+ | York, North Yorkshire | 7 | radiators | 4.89 | analyse |
| #759 | Vaillant Arotherm+ | Tavistock | 7 | radiators | 4.85 | analyse |
| #53 | Vaillant Arotherm+ | Stroud, Gloucestershire | 5 | underfloor | 4.82 | analyse |
| #1343 | Vaillant Arotherm+ | Wisbech, Cambridgeshire | 12 | underfloor | 4.74 | analyse |
| #889 | Vaillant Arotherm+ | Andover, Hampshire | 7 | underfloor | 4.73 | analyse |
| #748 | Grant Aerona HP290 | Llanberis, Gwynedd | 9 | radiators | 4.69 | analyse |
| #704 | Daikin Altherma 3 | Staffordshire | 8 | radiators | 4.68 | analyse |
| #1081 | Vaillant Arotherm+ | Eccleshall, Staffordshire | 5 | radiators | 4.65 | analyse |
| #116 | Samsung Gen 6 | Deiniolen, Gwynedd | 5 | underfloor | 4.59 | analyse |
| #1188 | Ecoforest Eco Air Pro | North Devon | 9 | radiators | 4.58 | analyse |
| #1248 | Global Energy R290 | Lancashire | 12 | radiators | 4.52 | analyse |
| #1409 | Vaillant Arotherm+ V2 | Acton, London | 5 | radiators | 4.51 | analyse |
| #670 | Vaillant Arotherm+ | Yelverton, Devon | 7 | radiators | 4.49 | analyse |
| #1223 | Vaillant Arotherm+ | Horsham, West Sussex | 5 | underfloor | 4.44 | analyse |
| #75 | Vaillant Arotherm+ | Beddgelert, Gwynedd | 5 | radiators | 4.43 | analyse |
| #1245 | Grant Aerona HP290 | Penrith, Cumbria | 6.5 | radiators | 4.43 | analyse |
| #1136 | Grant Aerona HP290 | Compton and Shawford, Hampshire | 15.5 | radiators | 4.43 | analyse |
| #752 | Vaillant Arotherm+ | Cardiff | 10 | radiators | 4.41 | analyse |
| #448 | Nibe S2125 | Bristol | 12 | underfloor | 4.41 | analyse |
| #382 | Samsung Gen 7 | Highley Nr Bridgnorth Shropshire. | 8 | radiators | 4.41 | analyse |
| #571 | Ecoforest ecoGEO+ B2 1-9 | Ballyliffin, Co. Donegal, Ireland | 11 | underfloor | 4.35 | analyse |
| #708 | Viessmann Vitocal 150A | Sonning Common, Oxfordshire | 8 | radiators | 4.34 | analyse |
| #262 | Vaillant Arotherm+ | Sawtry, Cambridgeshire | 7 | radiators | 4.33 | analyse |
| #1088 | Grant Aerona HP290 | Llanfrothen, Gwynedd | 6.5 | radiators | 4.31 | analyse |
| #956 | Vaillant Arotherm+ | Southampton, Hampshire | 10 | underfloor | 4.28 | analyse |
| #723 | Samsung Gen 7 | Wymondham, Norfolk | 16 | radiators | 4.25 | analyse |
| #51 | Vaillant Arotherm+ | Rushden, Northamptonshire | 7 | radiators | 4.25 | analyse |
| #307 | Viessmann Vitocal 151A | Great Haseley, Oxfordshire | 10 | underfloor | 4.24 | analyse |
| #1086 | Heliotherm Comfort Compact | Richmond | 18 | underfloor | 4.23 | analyse |
| #1150 | Grant Aerona HP290 | Jersey, Channel Islands | 6.5 | radiators | 4.22 | analyse |
| #1230 | Vaillant Arotherm+ | Southampton, Hampshire | 12 | underfloor | 4.22 | analyse |
| #702 | Maxa i32 | North Devon | 10 | radiators | 4.21 | analyse |
| #1344 | Vaillant Arotherm+ | Woking, Surrey | 12 | underfloor | 4.20 | analyse |
| #313 | Viessmann Vitocal 150A | York | 8 | underfloor | 4.19 | analyse |
| #1304 | Grant Aerona HP290 | Poole, Dorset | 15.5 | radiators | 4.19 | analyse |
| #812 | Vaillant Arotherm+ | Hove, East Sussex | 5 | radiators | 4.19 | analyse |
| #839 | Vaillant Arotherm+ | Derby, Derbyshire | 10 | radiators | 4.18 | analyse |
| #1365 | Daikin Altherma 3 | Rochdale, Greater Manchester | 8 | radiators | 4.18 | analyse |
| #787 | Vailllant Arotherm+ | Northampton | 7 | radiators | 4.15 | analyse |
| #169 | Vaillant Arotherm Split | Swanage, Dorset | 7 | radiators | 4.13 | analyse |
| #2 | Mitsubishi Ecodan | Llanberis, Gwynedd | 5 | radiators | 4.13 | analyse |
| #337 | Haier Super Aqua Monobloc | Elgin, Scotland | 4 | underfloor | 4.12 | analyse |
| #1267 | Vaillant Arotherm+ | Sutton Coldfield, West Midlands | 5 | radiators | 4.11 | analyse |
| #1153 | Grant Aerona HP290 | Kenmare, Co Kerry, Ireland | 6.5 | underfloor | 4.10 | analyse |
| #785 | Vailllant Arotherm+ | Cheltenham, Gloucestershire | 7 | radiators | 4.08 | analyse |
| #445 | Vaillant Arotherm+ | Hackney, London | 3.5 | radiators | 4.07 | analyse |
| #1366 | Vaillant Arotherm+ | Derby, Derbyshire | 10 | underfloor | 4.06 | analyse |
| #1124 | Vaillant Arotherm+ | Mid Ulster, Northern Ireland | 7 | underfloor | 4.06 | analyse |
| #350 | Vaillant Arotherm+ | Rotselaar, Belgium | 5 | underfloor | 4.06 | analyse |
| #300 | Viessmann Vitocal 150A | Croxley Green | 8 | underfloor | 4.06 | analyse |
| #112 | Mitsubishi Ecodan | Rayleigh, Essex | 8.5 | underfloor | 4.03 | analyse |
| #652 | Vaillant Arotherm+ | Milton Keynes, Buckinghamshire | 7 | underfloor | 4.02 | analyse |
| #383 | Mitsubishi Ecodan | Sheffield | 11.2 | radiators | 4.02 | analyse |
| #441 | Panasonic Aquarea M | Thurso | 9 | underfloor | 4.01 | analyse |
| #232 | Viessmann Vitocal 150A | Potters Bar, Hertfordshire | 6 | radiators | 3.98 | analyse |
| #1308 | Vaillant Arotherm+ | Birmingham | 5 | underfloor | 3.98 | analyse |
| #912 | Mitsubishi Ecodan | Chester, Cheshire | 6 | radiators | 3.96 | analyse |
| #1199 | Grant HP290 | Lusk, Dublin | 9 | radiators | 3.92 | analyse |
| #561 | Daikin Altherma 3 | Maidenhead | 8 | radiators | 3.90 | analyse |
| #585 | Vaillant Arotherm+ | Hinstock, Shropshire | 7 | radiators | 3.89 | analyse |
| #293 | Daikin Altherma 3 | Stalmine, Lancashire | 9 | underfloor | 3.89 | analyse |
| #1381 | Vaillant Arotherm+ | Rhigos, Rhondda Cynon Taf | 5 | underfloor | 3.87 | analyse |
| #167 | Nibe F2050 | Cadross, Dumbarton | 10 | radiators | 3.86 | analyse |
| #267 | Stiebel Eltron WPE-I 12 HK Premium | Shetland | 12 | underfloor | 3.86 | analyse |
| #1296 | Vaillant Arotherm+ | Swansea, West Glamorgan | 12 | radiators | 3.86 | analyse |
| #620 | Vaillant Arotherm+ | Oxford, Oxfordshire | 5 | radiators | 3.85 | analyse |
| #1264 | Grant Aerona HP290 | Shirebrook, Mansfield | 4 | radiators | 3.80 | analyse |
| #539 | Vaillant Arotherm+ | Great Bedwyn, Wiltshire | 7 | underfloor | 3.80 | analyse |
| #453 | Vaillant Arotherm+ | Edinburgh | 7 | radiators | 3.79 | analyse |
| #651 | Viessmann Vitocal 150A | Tongham, Surrey | 16 | radiators | 3.77 | analyse |
| #685 | Octopus Cosy | Pudsey, Leeds | 9 | radiators | 3.76 | analyse |
| #1407 | Mitsubishi Ecodan | Malton, North Yorkshire | 8.5 | radiators | 3.75 | analyse |
| #835 | Vaillant Arotherm+ | Pembrokeshire | 3.5 | underfloor | 3.74 | analyse |
| #1373 | Vaillant Arotherm+ | North Scarle, Lincoln | 7 | radiators | 3.71 | analyse |
| #805 | Daikin Altherma 3 | Manchester | 8 | radiators | 3.68 | analyse |
| #78 | Vaillant Arotherm+ | Bishops Stortford | 5 | underfloor | 3.67 | analyse |
| #1 | Mitsubishi Ecodan | Selby, Yorkshire | 11.2 | radiators | 3.66 | analyse |
| #525 | MasterTherm BA221 | Lincolnshire | 7.7 | underfloor | 3.66 | analyse |
| #1393 | Sunrain SMHP-006C1 | Dublin, Ireland | 6 | radiators | 3.62 | analyse |
| #1282 | Grant Aerona HP290 | Leatherhead, Surrey | 6.5 | radiators | 3.52 | analyse |
| #786 | Viessmann 150a | Byfield, Northamptonshire | 16 | radiators | 3.48 | analyse |
| #1251 | Vaillant Arotherm+ | Frodsham, Cheshire | 10 | radiators | 3.47 | analyse |
| #287 | Clivet Edge F | Dunholme, Lincoln, Lincolnshire | 12 | underfloor | 3.46 | analyse |
| #1169 | Viessmann Vitocal 150A | Halifax, West Yorkshire | 8 | radiators | 3.44 | analyse |
| #909 | Vaillant Arotherm+ | Wetherby, West Yorkshire | 7 | radiators | 3.43 | analyse |
| #625 | Viessmann Vitocal 150A | Marston Moretaine | 8 | radiators | 3.43 | analyse |
| #61 | Nibe F2040 | Sleaford, Lincolnshire | 12 | underfloor | 3.39 | analyse |
| #1231 | Viessmann Vitocal 150A Compact (151-A) | Heathfield, East Sussex, | 8 | underfloor | 3.38 | analyse |
| #1283 | Vaillant Arotherm+ | Crawley | 12 | underfloor | 3.38 | analyse |
| #1228 | Riello NXHM | Caernarfon, Gwynedd | 6 | radiators | 3.36 | analyse |
| #310 | Daikin Altherma 3 | Telford | 4 | radiators | 3.35 | analyse |
| #637 | Daikin Altherma 3 | Southampton, Hampshire | 9 | radiators | 3.35 | analyse |
| #1205 | Grant Aerona HP290 | Carshalton, Sutton | 9 | radiators | 3.32 | analyse |
| #1094 | Viessmann Vitocal 150A | Tring, Hertfordshire | 10 | radiators | 3.30 | analyse |
| #560 | Nibe F1145 | Hereford | 12 | radiators | 3.30 | analyse |
| #1217 | Vaillant Arotherm+ | Maidenhead, Berkshire | 7 | radiators | 3.27 | analyse |
| #122 | Mitsubishi Ecodan | Lightwater | 6 | underfloor | 3.23 | analyse |
| #290 | Ideal HP290 | Ashford, Kent | 8 | radiators | 3.20 | analyse |
| #419 | Daikin Altherma 3 | Dundee | 6 | radiators | 3.16 | analyse |
| #421 | Daikin Altherma 2 | Horsham, West Sussex | 7 | radiators | 3.16 | analyse |
| #1187 | Vaillant Arotherm+ | Hampshire | 7 | radiators | 3.13 | analyse |
| #927 | Vaillant Arotherm+ | Exeter, Devon | 5 | radiators | 3.13 | analyse |
| #1356 | Vaillant Arotherm+ V2 | Chellaston, Derby | 3.5 | radiators | 3.12 | analyse |
| #1278 | SOLAX STU1-CO8R290 | Stafford, Staffordshire | 8 | underfloor | 3.12 | analyse |
| #1099 | Samsung Gen 7 | 16500, Abzac, France | 12 | radiators | 3.11 | analyse |
| #1234 | Viessmann Vitocal 150A | Ludlow, Shropshire | 16 | radiators | 3.07 | analyse |
| #917 | Test Unit R290 | Basingstoke | 9 | underfloor | 3.06 | analyse |
| #295 | Daikin Altherma 3 | Marston Moretaine | 9 | radiators | 3.05 | analyse |
| #593 | Daikin Altherma 3 | Wing, Beds | 5 | radiators | 3.03 | analyse |
| #1018 | Daikin Altherma 3 | Carlton Barnsley | 8 | underfloor | 3.00 | analyse |
| #7 | Mitsubishi Ecodan | Weymouth | 14 | radiators | 3.00 | analyse |
| #1263 | Mitsubishi Ecodan | Shetland | 8.5 | underfloor | 2.99 | analyse |
| #88 | Stiebel Eltron WPL25-AS | Lichfield, UK | 12.5 | underfloor | 2.97 | analyse |
| #1376 | Grant Aerona HP290 | Neath, Neath Port Talbot | 6.5 | underfloor | 2.94 | analyse |
| #931 | Daikin Altherma 3 | Stratford-upon-Avon, West Midlands | 16 | radiators | 2.82 | analyse |
| #848 | Daikin Altherma 3 | South Devon | 11 | radiators | 2.82 | analyse |
| #1378 | Vaillant Arotherm+ V2 | Westbury-on-Trym, Bristol | 7 | underfloor | 2.77 | analyse |
| #1255 | Vaillant Arotherm+ | Glasgow | 10 | radiators | 2.71 | analyse |
| #1336 | Vaillant Arotherm+ V2 | Obdam, the Netherlands | 7 | underfloor | 2.69 | analyse |
| #1249 | Viessmann Vitocal 150A | Bentlawnt, Shropshire | 10 | underfloor | 2.66 | analyse |
| #1241 | Viessmann Vitocal 150A | Bristol, South Gloucestershire | 6 | radiators | 2.66 | analyse |
| #70 | Samsung Gen 6 | Carlby, STAMFORD | 12 | radiators | 2.65 | analyse |
| #968 | Samsung Gen 7 | Surbiton, Surrey | 12 | underfloor | 2.61 | analyse |
| #1375 | Daikin Altherma 3 | Pudsey, West Yorkshire | 8 | radiators | 2.60 | analyse |
| #1412 | Daikin Altherma 3 | Erts, Andorra | 14 | underfloor | 2.51 | analyse |
| #1305 | Viessmann Vitocal 150A | Bromley, London | 13 | radiators | 2.49 | analyse |
| #359 | Daikin Altherma Split | Isle of Wight | 11 | underfloor | 2.22 | analyse |
| #1329 | Grant Aerona R290 | Amersham, Buckinghamshire | 6.5 | radiators | 2.09 | analyse |
| #1292 | LG Therma V | Burgess Hill, West Sussex | 7 | radiators | 2.09 | analyse |
| #1275 | Nibe S2060 | Knaphill, Surry | 6 | radiators | 1.85 | analyse |
| #1312 | Vaillant Arotherm+ | Pool in Wharfedale, West Yorkshire | 7 | radiators | 1.68 | analyse |
| #529 | Mitsubishi Ecodan | Princetown, Devon | 6 | radiators | 1.13 | analyse |