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Home / system #295

Daikin Altherma 3

Marston Moretaine · Semi-detached · 88 m² · 1900 to 1939 · 9 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
3.27efficiency (COP) over 745 hours, from the heat meter
better than 24% of the metered fleet in January 2026
Electricity used
413 kWh
Heat delivered
1352 kWh (heat meter)
Estimate without heat meter
flow sensor 3.32 · temperature model 3.85
Mean outdoor temperature
7.0 °C · 335 space-heating hours · cooling 4 kWh removed (3 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
34.7 °C (curve slope -0.25 per K)
Flow − return while heating
3.3 K
House needs at −3 °C
3.4 kW (unit rated 9 kW) · fit r² 0.02
Hot water
28% of electricity, COP 2.76
infoUnit is rated 9 kW but the house needs about 3.4 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.
valueReaching the fleet’s January median (3.69) would have saved about £12 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 day013272025-12-01: 11.3 kWh, outside 9.9 °C2025-12-02: 9.2 kWh, outside 8.1 °C2025-12-03: 15.3 kWh, outside 5.2 °C2025-12-04: 10.1 kWh, outside 6.1 °C2025-12-05: 18.9 kWh, outside 4.7 °C2025-12-06: 11 kWh, outside 9.8 °C2025-12-07: 8 kWh, outside 10.1 °C2025-12-08: 6.4 kWh, outside 11.4 °C2025-12-09: 5.2 kWh, outside 12.5 °C2025-12-10: 7.2 kWh, outside 10 °C2025-12-11: 11.2 kWh, outside 8.9 °C2025-12-12: 8.8 kWh, outside 9 °C2025-12-13: 16 kWh, outside 5.6 °C2025-12-14: 12.6 kWh, outside 8.6 °C2025-12-15: 9.2 kWh, outside 10.3 °C2025-12-16: 9.6 kWh, outside 7.6 °C2025-12-17: 16.4 kWh, outside 5.4 °C2025-12-18: 10.3 kWh, outside 10.5 °C2025-12-19: 14.6 kWh, outside 7.4 °C2025-12-20: 16.1 kWh, outside 5 °C2025-12-21: 11.9 kWh, outside 8.5 °C2025-12-22: 10.7 kWh, outside 8.4 °C2025-12-23: 12.5 kWh, outside 5.9 °C2025-12-24: 18.2 kWh, outside 4 °C2025-12-25: 21 kWh, outside 2.8 °C2025-12-26: 20.6 kWh, outside 3.1 °C2025-12-27: 18.7 kWh, outside 3.9 °C2025-12-28: 14.1 kWh, outside 5.4 °C2025-12-29: 14.6 kWh, outside 5.1 °C2025-12-30: 19.2 kWh, outside 3.6 °C2025-12-31: 26.6 kWh, outside 0.8 °C2026-01-01: 0.1 kWh, outside 0.9 °Cdaily COP (heat ÷ electricity)1352025-12-01: COP 4.042025-12-02: COP 3.442025-12-03: COP 3.062025-12-04: COP 3.42025-12-05: COP 3.22025-12-06: COP 3.412025-12-07: COP 3.032025-12-08: COP 3.462025-12-09: COP 3.532025-12-10: COP 3.592025-12-11: COP 3.562025-12-12: COP 3.482025-12-13: COP 3.232025-12-14: COP 3.462025-12-15: COP 3.452025-12-16: COP 3.152025-12-17: COP 2.882025-12-18: COP 3.912025-12-19: COP 3.362025-12-20: COP 3.132025-12-21: COP 3.62025-12-22: COP 3.442025-12-23: COP 3.362025-12-24: COP 3.192025-12-25: COP 2.982025-12-26: COP 3.122025-12-27: COP 2.962025-12-28: COP 3.652025-12-29: COP 3.172025-12-30: COP 2.822025-12-31: COP 2.7412-0112-0512-0912-1312-1712-2112-2512-29
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

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