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Home / system #848

Daikin Altherma 3

South Devon · Detached · 179 m² · 1940 to 1982 · 11 kW · radiators · installed by CB Heating

Last 30 daysLast 7 days5 Jan – 4 Feb 2026 (winter reference)1–31 Dec 2025

1–31 Dec 2025

745 hourly rows · MID-class heat meter present: yes
3.09efficiency (COP) over 745 hours, from the heat meter
better than 12% of the metered fleet in January 2026
Electricity used
772 kWh
Heat delivered
2390 kWh (heat meter)
Estimate without heat meter
flow sensor 3.11 · temperature model 3.38
Mean outdoor temperature
7.7 °C · 423 space-heating hours · cooling 3 kWh removed (2 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
41.2 °C (curve slope -0.41 per K)
Flow − return while heating
4.7 K
House needs at −3 °C
7.0 kW (unit rated 11 kW) · fit r² 0.17
Hot water
20% of electricity, COP 2.51
infoNo configuration faults detected in this window
Keep the current settings. We will alert you if efficiency drifts.
valueReaching the fleet’s January median (3.69) would have saved about £31 in this window at 0.25 GBP/kWh. An estimate, not a promise.

Day by day

electricity per daydaily COP3.0 floor
electricity, kWh per day024482025-12-01: 18.7 kWh, outside 11.5 °C2025-12-02: 23.9 kWh, outside 6.5 °C2025-12-03: 23.3 kWh, outside 4.4 °C2025-12-04: 18.4 kWh, outside 6.8 °C2025-12-05: 32.6 kWh, outside 7.1 °C2025-12-06: 15.5 kWh, outside 10.8 °C2025-12-07: 13.5 kWh, outside 12.5 °C2025-12-08: 15.9 kWh, outside 12.4 °C2025-12-09: 15.2 kWh, outside 13 °C2025-12-10: 12.6 kWh, outside 10.2 °C2025-12-11: 18.5 kWh, outside 11 °C2025-12-12: 11.3 kWh, outside 8.8 °C2025-12-13: 25 kWh, outside 4.8 °C2025-12-14: 17.7 kWh, outside 10.9 °C2025-12-15: 17.1 kWh, outside 11 °C2025-12-16: 19.7 kWh, outside 7.3 °C2025-12-17: 28.9 kWh, outside 7.2 °C2025-12-18: 15.6 kWh, outside 10 °C2025-12-19: 22.5 kWh, outside 7.9 °C2025-12-20: 24.2 kWh, outside 7.6 °C2025-12-21: 20.6 kWh, outside 7.8 °C2025-12-22: 16.2 kWh, outside 10 °C2025-12-23: 23 kWh, outside 8.4 °C2025-12-24: 36.9 kWh, outside 5.2 °C2025-12-25: 45.5 kWh, outside 3.5 °C2025-12-26: 47.7 kWh, outside 3.8 °C2025-12-27: 33.8 kWh, outside 5 °C2025-12-28: 34.9 kWh, outside 6.2 °C2025-12-29: 38.6 kWh, outside 4.9 °C2025-12-30: 40.1 kWh, outside 4.4 °C2025-12-31: 42.7 kWh, outside -1 °C2026-01-01: 4.4 kWh, outside -2.2 °Cdaily COP (heat ÷ electricity)1352025-12-01: COP 3.962025-12-02: COP 2.792025-12-03: COP 2.962025-12-04: COP 2.92025-12-05: COP 3.352025-12-06: COP 3.442025-12-07: COP 3.572025-12-08: COP 4.042025-12-09: COP 4.012025-12-10: COP 3.312025-12-11: COP 3.972025-12-12: COP 3.242025-12-13: COP 2.982025-12-14: COP 3.762025-12-15: COP 3.652025-12-16: COP 3.072025-12-17: COP 3.392025-12-18: COP 3.452025-12-19: COP 2.882025-12-20: COP 3.612025-12-21: COP 3.642025-12-22: COP 3.872025-12-23: COP 3.422025-12-24: COP 2.722025-12-25: COP 2.622025-12-26: COP 2.582025-12-27: COP 2.552025-12-28: COP 3.012025-12-29: COP 2.792025-12-30: COP 2.742025-12-31: COP 2.132026-01-01: COP 2.2612-0112-0512-0912-1312-1712-2112-2512-29
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060-6-303691215outdoor temperature, °Cflow temperature, °C
Each point is one hour of space heating. Lower and flatter is cheaper; well-set radiator systems sit around 35–42 °C at 0 °C outside.
Public system published by its owner on HeatpumpMonitor.org. Cycling (starts per hour) comes from the site’s 365-day statistic. Findings use installer rules of thumb; see methodology.