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Home / system #805

Daikin Altherma 3

Manchester · Detached · 117 m² · 2012 or newer · 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

391 hourly rows · MID-class heat meter present: no
1.64efficiency (COP) over 391 hours, from the heat meter
better than 1% of the metered fleet in January 2026
Electricity used
358 kWh
Heat delivered
588 kWh (heat meter)
Estimate without heat meter
flow sensor 1.67 · temperature model 3.32
Mean outdoor temperature
7.6 °C · 328 space-heating hours
Flow temperature at 0 °C outside
42.6 °C (curve slope -0.46 per K)
Flow − return while heating
5.2 K
House needs at −3 °C
6.2 kW (unit rated 8 kW) · fit r² 0.07
Hot water
10% of electricity, COP 3.57
seriousWinter efficiency 1.64 is below the 3.0 floor used for German subsidies
Ask the installer for a commissioning check; the causes are usually flow temperature, hot water settings, or sizing, all listed below.
noteOwner’s note on the source site: “No data”
valueReaching the fleet’s January median (3.69) would have saved about £50 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 day019392025-12-01: 19.1 kWh, outside 11 °C2025-12-02: 22.4 kWh, outside 7.8 °C2025-12-03: 23.8 kWh, outside 6.7 °C2025-12-04: 23.5 kWh, outside 7.4 °C2025-12-05: 25 kWh, outside 5.6 °C2025-12-06: 18.4 kWh, outside 10.4 °C2025-12-07: 14.1 kWh, outside 8.4 °C2025-12-08: 15.8 kWh, outside – °C2025-12-09: 12.6 kWh, outside – °C2025-12-10: 17.4 kWh, outside 9 °C2025-12-11: 15.5 kWh, outside 8.2 °C2025-12-12: 15.4 kWh, outside – °C2025-12-20: 9 kWh, outside – °C2025-12-27: 2 kWh, outside 7.5 °C2025-12-28: 28.1 kWh, outside 6.8 °C2025-12-29: 25.4 kWh, outside 7.2 °C2025-12-30: 28.9 kWh, outside 5.8 °C2025-12-31: 38.9 kWh, outside 0.6 °C2026-01-01: 2.8 kWh, outside – °Cdaily COP (heat ÷ electricity)1352025-12-01: COP 4.162025-12-02: COP 3.562025-12-03: COP 3.732025-12-04: COP 3.182025-12-05: COP 0.712025-12-06: COP 0.872025-12-07: COP 0.492025-12-10: COP 0.272025-12-11: COP 2.242025-12-27: COP 5.172025-12-28: COP 3.182025-12-29: COP 1.312025-12-30: COP 0.512025-12-31: COP 0.9512-0112-0312-0512-0712-0912-1112-2012-2812-3001-01
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060-3-113579111315outdoor 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.