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Home / system #293

Daikin Altherma 3

Stalmine, Lancashire · Detached · 125 m² · Pre-1900 · 9 kW · underfloor · installed by Octopus Energy Services

Last 30 daysLast 7 days5 Jan – 4 Feb 2026 (winter reference)1–31 Dec 2025

5 Jan – 4 Feb 2026 (winter reference)

721 hourly rows · MID-class heat meter present: no
3.54efficiency (COP) over 721 hours, from the heat meter
better than 38% of the metered fleet in January 2026
Electricity used
1065 kWh
Heat delivered
3775 kWh (heat meter)
Estimate without heat meter
flow sensor 3.51 · temperature model 2.97
Mean outdoor temperature
3.0 °C · 543 space-heating hours
Flow temperature at 0 °C outside
41.0 °C (curve slope -0.67 per K)
Flow − return while heating
4.1 K
House needs at −3 °C
7.0 kW (unit rated 9 kW) · fit r² 0.31
Hot water
26% of electricity, COP 3.29
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 £11 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 day029582026-01-05: 52.7 kWh, outside -3.9 °C2026-01-06: 58.3 kWh, outside -1.2 °C2026-01-07: 45.1 kWh, outside 2.5 °C2026-01-08: 51.1 kWh, outside 0.8 °C2026-01-09: 45.9 kWh, outside 1.8 °C2026-01-10: 48.8 kWh, outside -0.8 °C2026-01-11: 40.7 kWh, outside 3.3 °C2026-01-12: 22.1 kWh, outside 6.2 °C2026-01-13: 26.2 kWh, outside 4.4 °C2026-01-14: 39.1 kWh, outside 1 °C2026-01-15: 37.3 kWh, outside 1.4 °C2026-01-16: 38.8 kWh, outside 1.5 °C2026-01-17: 32.3 kWh, outside 4.2 °C2026-01-18: 32.5 kWh, outside 2.9 °C2026-01-19: 27.8 kWh, outside 4.1 °C2026-01-20: 26.2 kWh, outside 5.7 °C2026-01-21: 28.3 kWh, outside 4.9 °C2026-01-22: 24.3 kWh, outside 5.9 °C2026-01-23: 26.1 kWh, outside 5 °C2026-01-24: 28.7 kWh, outside 4.5 °C2026-01-25: 28 kWh, outside 4.5 °C2026-01-26: 39.1 kWh, outside 2 °C2026-01-27: 36.9 kWh, outside 3.6 °C2026-01-28: 30.6 kWh, outside 3 °C2026-01-29: 39.8 kWh, outside 2.4 °C2026-01-30: 38.3 kWh, outside 2.9 °C2026-01-31: 27.5 kWh, outside 5.3 °C2026-02-01: 22.4 kWh, outside 4.8 °C2026-02-02: 27.1 kWh, outside 4.6 °C2026-02-03: 41.4 kWh, outside 1.9 °C2026-02-04: 2 kWh, outside 1 °Cdaily COP (heat ÷ electricity)1352026-01-05: COP 2.682026-01-06: COP 2.782026-01-07: COP 3.262026-01-08: COP 3.032026-01-09: COP 3.232026-01-10: COP 2.932026-01-11: COP 3.572026-01-12: COP 4.532026-01-13: COP 4.022026-01-14: COP 3.332026-01-15: COP 3.532026-01-16: COP 3.32026-01-17: COP 4.082026-01-18: COP 3.842026-01-19: COP 4.192026-01-20: COP 4.312026-01-21: COP 4.082026-01-22: COP 4.312026-01-23: COP 4.122026-01-24: COP 3.972026-01-25: COP 3.952026-01-26: COP 3.382026-01-27: COP 3.692026-01-28: COP 3.662026-01-29: COP 3.382026-01-30: COP 3.482026-01-31: COP 4.242026-02-01: COP 4.162026-02-02: COP 3.792026-02-03: COP 3.232026-02-04: COP 2.901-0501-0901-1301-1701-2101-2501-2902-02
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060-7-5-3-113579outdoor 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.