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Home / system #1018

Daikin Altherma 3

Carlton Barnsley · Semi-detached · 109 m² · 1900 to 1939 · 8 kW · underfloor · installed by Damon Blakemore

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: yes
3.26efficiency (COP) over 721 hours, from the heat meter
better than 24% of the metered fleet in January 2026
Electricity used
492 kWh
Heat delivered
1606 kWh (heat meter)
Estimate without heat meter
flow sensor 3.17 · temperature model 3.28
Mean outdoor temperature
4.2 °C · 294 space-heating hours · cooling 0 kWh removed (0 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
37.0 °C (curve slope -0.53 per K)
Flow − return while heating
4.3 K
House needs at −3 °C
6.1 kW (unit rated 8 kW) · fit r² 0.09
Hot water
12% of electricity, COP 2.44
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 £14 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 day019382026-01-05: 37.6 kWh, outside -1.7 °C2026-01-06: 28.5 kWh, outside 0.5 °C2026-01-07: 19.5 kWh, outside 3.3 °C2026-01-08: 21.7 kWh, outside 0.6 °C2026-01-09: 22.3 kWh, outside 2.7 °C2026-01-10: 31.8 kWh, outside 0.1 °C2026-01-11: 16.6 kWh, outside 3.2 °C2026-01-12: 9.6 kWh, outside 8.8 °C2026-01-13: 15.4 kWh, outside 6.1 °C2026-01-14: 17 kWh, outside 2.5 °C2026-01-15: 12.8 kWh, outside 4.5 °C2026-01-16: 14.1 kWh, outside 4.6 °C2026-01-17: 9.7 kWh, outside 5.7 °C2026-01-18: 12.4 kWh, outside 5.2 °C2026-01-19: 10.1 kWh, outside 6.9 °C2026-01-20: 10.1 kWh, outside 7.7 °C2026-01-21: 11.1 kWh, outside 6.5 °C2026-01-22: 14 kWh, outside 6.1 °C2026-01-23: 11.7 kWh, outside 6.3 °C2026-01-24: 13.4 kWh, outside 5.8 °C2026-01-25: 11.6 kWh, outside 4.7 °C2026-01-26: 18.2 kWh, outside 2.6 °C2026-01-27: 13.5 kWh, outside 4.6 °C2026-01-28: 19.5 kWh, outside 2.8 °C2026-01-29: 17.3 kWh, outside 3.3 °C2026-01-30: 17 kWh, outside 3.7 °C2026-01-31: 14.5 kWh, outside 6.5 °C2026-02-01: 9.9 kWh, outside 6.2 °C2026-02-02: 14.6 kWh, outside 5.2 °C2026-02-03: 17.4 kWh, outside 2.4 °C2026-02-04: 0.1 kWh, outside 1.5 °Cdaily COP (heat ÷ electricity)1352026-01-05: COP 2.222026-01-06: COP 2.322026-01-07: COP 3.142026-01-08: COP 2.932026-01-09: COP 3.212026-01-10: COP 2.342026-01-11: COP 3.352026-01-12: COP 4.242026-01-13: COP 3.512026-01-14: COP 3.182026-01-15: COP 3.682026-01-16: COP 3.722026-01-17: COP 3.942026-01-18: COP 3.752026-01-19: COP 4.412026-01-20: COP 4.022026-01-21: COP 4.062026-01-22: COP 3.822026-01-23: COP 3.952026-01-24: COP 3.742026-01-25: COP 3.642026-01-26: COP 3.212026-01-27: COP 3.492026-01-28: COP 3.052026-01-29: COP 3.212026-01-30: COP 3.42026-01-31: COP 3.972026-02-01: COP 3.312026-02-02: COP 3.782026-02-03: COP 2.9601-0501-0901-1301-1701-2101-2501-2902-02
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060-5-3-11357911outdoor 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.