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Home / system #561

Daikin Altherma 3

Maidenhead · Semi-detached · 113 m² · 1940 to 1982 · 8 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: yes
4.07efficiency (COP) over 745 hours, from the heat meter
better than 81% of the metered fleet in January 2026
Electricity used
381 kWh
Heat delivered
1551 kWh (heat meter)
Estimate without heat meter
flow sensor 2.19 · temperature model 3.82
Mean outdoor temperature
6.0 °C · 546 space-heating hours · cooling 0 kWh removed (0 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
34.8 °C (curve slope -0.32 per K)
Flow − return while heating
4.4 K
House needs at −3 °C
3.1 kW (unit rated 8 kW) · fit r² 0.29
Hot water
22% of electricity, COP 3.59
infoUnit is rated 8 kW but the house needs about 3.1 kW at −3 °C
Oversizing causes cycling in mild weather. Cannot be fixed cheaply now, but the curve and minimum run time can limit the damage.

Day by day

electricity per daydaily COP3.0 floor
electricity, kWh per day012242025-12-01: 7.7 kWh, outside – °C2025-12-02: 11.2 kWh, outside – °C2025-12-03: 13.1 kWh, outside – °C2025-12-04: 15.4 kWh, outside – °C2025-12-05: 20.9 kWh, outside – °C2025-12-06: 8.2 kWh, outside – °C2025-12-07: 8.1 kWh, outside – °C2025-12-08: 7.4 kWh, outside – °C2025-12-09: 6.5 kWh, outside – °C2025-12-10: 9.6 kWh, outside – °C2025-12-11: 11.3 kWh, outside – °C2025-12-12: 8.6 kWh, outside – °C2025-12-13: 13.9 kWh, outside – °C2025-12-14: 11.5 kWh, outside – °C2025-12-15: 7.6 kWh, outside – °C2025-12-16: 9.5 kWh, outside – °C2025-12-17: 16 kWh, outside 9.3 °C2025-12-18: 6.9 kWh, outside 10.7 °C2025-12-19: 12.6 kWh, outside 7.1 °C2025-12-20: 12.3 kWh, outside 5.2 °C2025-12-21: 8.6 kWh, outside 9 °C2025-12-22: 8.5 kWh, outside 10.1 °C2025-12-23: 12 kWh, outside 7.2 °C2025-12-24: 16.2 kWh, outside 4.9 °C2025-12-25: 17.9 kWh, outside 3.6 °C2025-12-26: 15.3 kWh, outside 4.5 °C2025-12-27: 15.2 kWh, outside 5.3 °C2025-12-28: 14.1 kWh, outside 6.4 °C2025-12-29: 14.6 kWh, outside 5.3 °C2025-12-30: 14.9 kWh, outside 3.9 °C2025-12-31: 23.8 kWh, outside -0.1 °C2026-01-01: 1.7 kWh, outside -0.7 °Cdaily COP (heat ÷ electricity)1352025-12-01: COP 4.352025-12-02: COP 4.452025-12-03: COP 3.872025-12-04: COP 3.872025-12-05: COP 3.152025-12-06: COP 4.462025-12-07: COP 4.472025-12-08: COP 4.392025-12-09: COP 4.752025-12-10: COP 4.382025-12-11: COP 4.242025-12-12: COP 4.442025-12-13: COP 3.982025-12-14: COP 42025-12-15: COP 4.42025-12-16: COP 4.532025-12-17: COP 3.672025-12-18: COP 4.722025-12-19: COP 4.222025-12-20: COP 3.982025-12-21: COP 4.572025-12-22: COP 4.632025-12-23: COP 4.432025-12-24: COP 4.222025-12-25: COP 3.962025-12-26: COP 3.972025-12-27: COP 4.212025-12-28: COP 4.352025-12-29: COP 4.152025-12-30: COP 42025-12-31: COP 3.112026-01-01: COP 2.8812-0112-0512-0912-1312-1712-2112-2512-29
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060-3-1135791113outdoor 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.