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Home / system #310

Daikin Altherma 3

Telford · Detached · 130 m² · 2012 or newer · 4 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
310 kWh
Heat delivered
1114 kWh (heat meter)
Estimate without heat meter
flow sensor 3.68 · temperature model 3.49
Mean outdoor temperature
7.7 °C · 321 space-heating hours · cooling 12 kWh removed (2 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
39.6 °C (curve slope -0.37 per K)
Flow − return while heating
5.5 K
House needs at −3 °C
4.1 kW (unit rated 4 kW) · fit r² 0.11
Hot water
12% of electricity, COP 3.15
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 £2 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 day010202025-12-01: 6.9 kWh, outside 10.8 °C2025-12-02: 9.2 kWh, outside 8.6 °C2025-12-03: 11.7 kWh, outside 5.6 °C2025-12-04: 10.5 kWh, outside 6.8 °C2025-12-05: 15 kWh, outside 5 °C2025-12-06: 7.3 kWh, outside 9.2 °C2025-12-07: 7 kWh, outside 11.1 °C2025-12-08: 4.2 kWh, outside 12.3 °C2025-12-09: 2.8 kWh, outside 12.8 °C2025-12-10: 5.6 kWh, outside 10.6 °C2025-12-11: 7 kWh, outside 9.6 °C2025-12-12: 5.6 kWh, outside 8.4 °C2025-12-13: 12 kWh, outside 6.5 °C2025-12-14: 7.1 kWh, outside 9.7 °C2025-12-15: 5.3 kWh, outside 9.4 °C2025-12-16: 8.5 kWh, outside 7 °C2025-12-17: 12.6 kWh, outside 7.1 °C2025-12-18: 6.9 kWh, outside 9.1 °C2025-12-19: 7.9 kWh, outside 8.4 °C2025-12-20: 10.2 kWh, outside 6.4 °C2025-12-21: 10.2 kWh, outside 8 °C2025-12-22: 5.9 kWh, outside 8.8 °C2025-12-23: 7.7 kWh, outside 7.2 °C2025-12-24: 14.4 kWh, outside 5.2 °C2025-12-25: 13.4 kWh, outside 4.1 °C2025-12-26: 18.6 kWh, outside 3.2 °C2025-12-27: 14.5 kWh, outside 6 °C2025-12-28: 12.1 kWh, outside 5.8 °C2025-12-29: 15.5 kWh, outside 5.2 °C2025-12-30: 16.8 kWh, outside 4.4 °C2025-12-31: 19.9 kWh, outside 3.3 °C2026-01-01: 0 kWh, outside 3.5 °Cdaily COP (heat ÷ electricity)1352025-12-01: COP 4.542025-12-02: COP 3.672025-12-03: COP 3.42025-12-04: COP 3.712025-12-05: COP 3.22025-12-06: COP 4.072025-12-07: COP 4.182025-12-08: COP 4.42025-12-09: COP 5.142025-12-10: COP 3.812025-12-11: COP 4.052025-12-12: COP 3.982025-12-13: COP 3.552025-12-14: COP 4.012025-12-15: COP 4.232025-12-16: COP 4.132025-12-17: COP 3.512025-12-18: COP 4.112025-12-19: COP 3.832025-12-20: COP 3.72025-12-21: COP 4.082025-12-22: COP 3.932025-12-23: COP 3.672025-12-24: COP 3.312025-12-25: COP 2.812025-12-26: COP 2.812025-12-27: COP 2.072025-12-28: COP 3.52025-12-29: COP 3.582025-12-30: COP 3.32025-12-31: COP 3.1712-0112-0512-0912-1312-1712-2112-2512-29
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
203040506002468101214outdoor 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.