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Home / system #637

Daikin Altherma 3

Southampton, Hampshire · Detached · 185 m² · 1983 to 2011 · 9 kW · radiators · installed by Octopus Energy Services

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

Last 30 days

721 hourly rows · MID-class heat meter present: no
3.94efficiency (COP) over 721 hours, from the heat meter
better than 72% of the metered fleet in January 2026
Electricity used
253 kWh
Heat delivered
999 kWh (heat meter)
Estimate without heat meter
flow sensor 4.11 · temperature model 4.30
Mean outdoor temperature
11.4 °C · 160 space-heating hours · cooling 0 kWh removed (0 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
42.0 °C (curve slope -0.78 per K)
Flow − return while heating
4.5 K
House needs at −3 °C
7.3 kW (unit rated 9 kW) · fit r² 0.12
Hot water
26% of electricity, COP 3.38
infoNo configuration faults detected in this window
Keep the current settings. We will alert you if efficiency drifts.

Day by day

electricity per daydaily COP3.0 floor
electricity, kWh per day09182026-10-08: 2.3 kWh, outside 12.7 °C2026-10-09: 3.4 kWh, outside 15.2 °C2026-10-10: 7 kWh, outside 11.8 °C2026-10-11: 6 kWh, outside 12.5 °C2026-10-12: 4.4 kWh, outside 15.7 °C2026-10-13: 0.5 kWh, outside 16.5 °C2026-10-14: 2.2 kWh, outside 13.7 °C2026-10-15: 2 kWh, outside 16.9 °C2026-10-16: 1.4 kWh, outside 12.9 °C2026-10-17: 2.4 kWh, outside 9.3 °C2026-10-18: 3.7 kWh, outside 9.2 °C2026-10-19: 13.3 kWh, outside 9.8 °C2026-10-20: 9.4 kWh, outside 10.2 °C2026-10-21: 12.5 kWh, outside 9.9 °C2026-10-22: 4.9 kWh, outside 12 °C2026-10-23: 10 kWh, outside 10.5 °C2026-10-24: 12.7 kWh, outside 11.5 °C2026-10-25: 8.3 kWh, outside 10.6 °C2026-10-26: 8.2 kWh, outside 13.3 °C2026-10-27: 6.5 kWh, outside 12.8 °C2026-10-28: 7.1 kWh, outside 12.1 °C2026-10-29: 8.6 kWh, outside 11.9 °C2026-10-30: 9.6 kWh, outside 10.6 °C2026-10-31: 8.7 kWh, outside 10 °C2026-11-01: 13.4 kWh, outside 7.7 °C2026-11-02: 13 kWh, outside 9.2 °C2026-11-03: 14.3 kWh, outside 9.1 °C2026-11-04: 17.6 kWh, outside 8.3 °C2026-11-05: 17.1 kWh, outside 8.2 °C2026-11-06: 15.4 kWh, outside 9.6 °C2026-11-07: 7.7 kWh, outside 5.8 °Cdaily COP (heat ÷ electricity)1352026-10-08: COP 3.212026-10-09: COP 2.282026-10-10: COP 3.882026-10-11: COP 3.952026-10-12: COP 4.212026-10-14: COP 3.162026-10-15: COP 3.532026-10-16: COP 2.352026-10-17: COP 2.752026-10-18: COP 4.172026-10-19: COP 4.152026-10-20: COP 4.632026-10-21: COP 4.072026-10-22: COP 4.552026-10-23: COP 4.172026-10-24: COP 4.182026-10-25: COP 4.332026-10-26: COP 4.122026-10-27: COP 4.542026-10-28: COP 4.332026-10-29: COP 3.972026-10-30: COP 3.52026-10-31: COP 4.122026-11-01: COP 3.882026-11-02: COP 42026-11-03: COP 3.892026-11-04: COP 3.782026-11-05: COP 3.822026-11-06: COP 3.952026-11-07: COP 2.9210-0810-1210-1610-2010-2410-2811-0111-05
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060246810121416outdoor 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.