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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 7 days

169 hourly rows · MID-class heat meter present: no
3.81efficiency (COP) over 169 hours, from the heat meter
better than 62% of the metered fleet in January 2026
Electricity used
103 kWh
Heat delivered
391 kWh (heat meter)
Estimate without heat meter
flow sensor 3.90 · temperature model 3.99
Mean outdoor temperature
8.7 °C · 63 space-heating hours · cooling 0 kWh removed (0 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
43.5 °C (curve slope -1.01 per K)
Flow − return while heating
4.6 K
House needs at −3 °C
7.2 kW (unit rated 9 kW) · fit r² 0.07
Hot water
19% of electricity, COP 3.37
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 day09182026-10-31: 4 kWh, outside 10.7 °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)1352026-10-31: COP 3.992026-11-01: 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 2.9210-3111-0111-0211-0311-0411-0511-0611-07
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
20304050602345678910111213outdoor 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.