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Home / system #421

Daikin Altherma 2

Horsham, West Sussex · Detached · 128 m² · 1983 to 2011 · 7 kW · radiators · installed by Octopus Energy Services

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: no
3.59efficiency (COP) over 745 hours, from the heat meter
better than 43% of the metered fleet in January 2026
Electricity used
490 kWh
Heat delivered
1756 kWh (heat meter)
Estimate without heat meter
flow sensor 3.68 · temperature model 3.76
Mean outdoor temperature
8.0 °C · 613 space-heating hours · cooling 1 kWh removed (1 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
38.1 °C (curve slope -0.45 per K)
Flow − return while heating
3.5 K
House needs at −3 °C
4.4 kW (unit rated 7 kW) · fit r² 0.49
Hot water
12% of electricity, COP 2.67
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 £3 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 day021422025-12-01: 11.2 kWh, outside 10.3 °C2025-12-02: 12.8 kWh, outside 8.7 °C2025-12-03: 14.2 kWh, outside 7.3 °C2025-12-04: 15.8 kWh, outside 6.7 °C2025-12-05: 23 kWh, outside 4.8 °C2025-12-06: 11.1 kWh, outside 10.2 °C2025-12-07: 9.4 kWh, outside 11.1 °C2025-12-08: 10.2 kWh, outside 13 °C2025-12-09: 9.4 kWh, outside 12.2 °C2025-12-10: 10.9 kWh, outside 11.3 °C2025-12-11: 10.9 kWh, outside 10 °C2025-12-12: 10.7 kWh, outside 10.8 °C2025-12-13: 15.1 kWh, outside 7 °C2025-12-14: 14.6 kWh, outside 8.5 °C2025-12-15: 11 kWh, outside 10.9 °C2025-12-16: 11.3 kWh, outside 10.5 °C2025-12-17: 18.3 kWh, outside 6.8 °C2025-12-18: 11.6 kWh, outside 11 °C2025-12-19: 13.9 kWh, outside 8.3 °C2025-12-20: 16.5 kWh, outside 7.1 °C2025-12-21: 11.8 kWh, outside 10 °C2025-12-22: 10.2 kWh, outside 10 °C2025-12-23: 14.9 kWh, outside 7.3 °C2025-12-24: 19.4 kWh, outside 5.3 °C2025-12-25: 24 kWh, outside 4 °C2025-12-26: 21.1 kWh, outside 4.5 °C2025-12-27: 19.8 kWh, outside 5.6 °C2025-12-28: 15.5 kWh, outside 6.6 °C2025-12-29: 22.5 kWh, outside 4.6 °C2025-12-30: 26.3 kWh, outside 3.4 °C2025-12-31: 41.5 kWh, outside -0.7 °C2026-01-01: 2 kWh, outside -2.9 °Cdaily COP (heat ÷ electricity)1352025-12-01: COP 4.392025-12-02: COP 3.932025-12-03: COP 3.682025-12-04: COP 3.62025-12-05: COP 3.082025-12-06: COP 4.322025-12-07: COP 4.642025-12-08: COP 4.272025-12-09: COP 4.562025-12-10: COP 4.012025-12-11: COP 4.222025-12-12: COP 42025-12-13: COP 3.552025-12-14: COP 3.872025-12-15: COP 4.32025-12-16: COP 4.222025-12-17: COP 3.342025-12-18: COP 4.342025-12-19: COP 3.842025-12-20: COP 3.462025-12-21: COP 4.062025-12-22: COP 4.242025-12-23: COP 3.782025-12-24: COP 3.32025-12-25: COP 2.982025-12-26: COP 3.242025-12-27: COP 3.392025-12-28: COP 3.912025-12-29: COP 3.192025-12-30: COP 3.032025-12-31: COP 2.492026-01-01: COP 2.3412-0112-0512-0912-1312-1712-2112-2512-29
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060-4-12581114outdoor 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.