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Home / system #805

Daikin Altherma 3

Manchester · Detached · 117 m² · 2012 or newer · 8 kW · radiators · 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)

720 hourly rows · MID-class heat meter present: no
2.05efficiency (COP) over 720 hours, from the heat meter
better than 1% of the metered fleet in January 2026
Electricity used
820 kWh
Heat delivered
1682 kWh (heat meter)
Estimate without heat meter
flow sensor 2.08 · temperature model 3.11
Mean outdoor temperature
6.4 °C · 591 space-heating hours · cooling 3 kWh removed (3 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
42.4 °C (curve slope -0.47 per K)
Flow − return while heating
5.3 K
House needs at −3 °C
5.9 kW (unit rated 8 kW) · fit r² 0.07
Hot water
12% of electricity, COP 3.45
seriousWinter efficiency 2.05 is below the 3.0 floor used for German subsidies
Ask the installer for a commissioning check; the causes are usually flow temperature, hot water settings, or sizing, all listed below.
noteOwner’s note on the source site: “No data”
valueReaching the fleet’s January median (3.69) would have saved about £91 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 day030602026-01-05: 59.6 kWh, outside -2.3 °C2026-01-06: 45.8 kWh, outside -3.2 °C2026-01-07: 34.7 kWh, outside 1.4 °C2026-01-08: 35.3 kWh, outside 2.8 °C2026-01-09: 33.8 kWh, outside 5 °C2026-01-10: 39 kWh, outside 1.2 °C2026-01-11: 28.2 kWh, outside 3.3 °C2026-01-12: 21.3 kWh, outside – °C2026-01-13: 22.7 kWh, outside 8.2 °C2026-01-14: 32.6 kWh, outside 2.7 °C2026-01-15: 27.7 kWh, outside 6.3 °C2026-01-16: 24.8 kWh, outside 6.1 °C2026-01-17: 23.3 kWh, outside 7.6 °C2026-01-18: 21.4 kWh, outside 7.1 °C2026-01-19: 20.3 kWh, outside 7.3 °C2026-01-20: 18.9 kWh, outside 9.5 °C2026-01-21: 19.9 kWh, outside 6.8 °C2026-01-22: 17.3 kWh, outside 8.8 °C2026-01-23: 23.1 kWh, outside 8.3 °C2026-01-24: 23.8 kWh, outside 8 °C2026-01-25: 22.6 kWh, outside 7.1 °C2026-01-26: 31.5 kWh, outside 4.7 °C2026-01-27: 28 kWh, outside 6.9 °C2026-01-28: 25.4 kWh, outside 6.7 °C2026-01-29: 24.4 kWh, outside 5.8 °C2026-01-30: 24.8 kWh, outside 6.2 °C2026-01-31: 22 kWh, outside 8.6 °C2026-02-01: 19.8 kWh, outside 7.9 °C2026-02-02: 21.4 kWh, outside 7.6 °C2026-02-03: 27.1 kWh, outside 4.8 °C2026-02-04: 2.5 kWh, outside – °Cdaily COP (heat ÷ electricity)1352026-01-05: COP 1.082026-01-06: COP 0.982026-01-07: COP 0.132026-01-08: COP 0.692026-01-09: COP 1.142026-01-10: COP 1.352026-01-11: COP 0.262026-01-13: COP 1.222026-01-14: COP 0.712026-01-15: COP 2.352026-01-16: COP 2.172026-01-17: COP 0.812026-01-18: COP 1.562026-01-19: COP 22026-01-20: COP 2.882026-01-21: COP 1.442026-01-22: COP 2.342026-01-23: COP 3.782026-01-24: COP 3.82026-01-25: COP 3.852026-01-26: COP 3.392026-01-27: COP 3.312026-01-28: COP 3.622026-01-29: COP 3.852026-01-30: COP 3.222026-01-31: COP 3.442026-02-01: COP 3.792026-02-02: COP 3.892026-02-03: COP 3.401-0501-0901-1301-1701-2101-2501-2902-02
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
203040506070-6-4-2024681012outdoor 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.