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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

Last 30 days

721 hourly rows · MID-class heat meter present: yes
3.11efficiency (COP) over 721 hours, from the heat meter
better than 14% of the metered fleet in January 2026
Electricity used
212 kWh
Heat delivered
660 kWh (heat meter)
Estimate without heat meter
flow sensor 3.03 · temperature model 3.84
Mean outdoor temperature
10.3 °C · 115 space-heating hours · cooling 1 kWh removed (5 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
39.6 °C (curve slope -0.51 per K)
Flow − return while heating
4.2 K
House needs at −3 °C
6.1 kW (unit rated 8 kW) · fit r² 0.01
Hot water
30% of electricity, COP 0.57
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 £8 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 day07132026-10-08: 0.7 kWh, outside 10.9 °C2026-10-09: 4.2 kWh, outside 13.6 °C2026-10-10: 5.7 kWh, outside 10.5 °C2026-10-11: 4.5 kWh, outside 9.8 °C2026-10-12: 6.4 kWh, outside 11.5 °C2026-10-13: 1.7 kWh, outside 14.7 °C2026-10-14: 1.9 kWh, outside 13 °C2026-10-15: 3.7 kWh, outside 14.9 °C2026-10-16: 5.9 kWh, outside 9.8 °C2026-10-17: 12.1 kWh, outside 8.4 °C2026-10-18: 9.4 kWh, outside 9.1 °C2026-10-19: 1.8 kWh, outside 11.9 °C2026-10-20: 5.5 kWh, outside 11.1 °C2026-10-21: 5 kWh, outside 9.3 °C2026-10-22: 11.8 kWh, outside 8.2 °C2026-10-23: 7.5 kWh, outside 9.2 °C2026-10-24: 13.1 kWh, outside 8.8 °C2026-10-25: 9.9 kWh, outside 9.9 °C2026-10-26: 10.9 kWh, outside 11.2 °C2026-10-27: 4.8 kWh, outside 12.8 °C2026-10-28: 7.3 kWh, outside 10.9 °C2026-10-29: 7.3 kWh, outside 10.5 °C2026-10-30: 10 kWh, outside 9.5 °C2026-10-31: 9.7 kWh, outside 8.4 °C2026-11-01: 10.6 kWh, outside 7.9 °C2026-11-02: 9.4 kWh, outside 7.9 °C2026-11-03: 8.7 kWh, outside 9.1 °C2026-11-04: 8.9 kWh, outside 9.4 °C2026-11-05: 6.6 kWh, outside 9.3 °C2026-11-06: 9.3 kWh, outside 9.3 °C2026-11-07: 3.2 kWh, outside 7.8 °Cdaily COP (heat ÷ electricity)1352026-10-08: COP 3.12026-10-09: COP 3.232026-10-10: COP 3.112026-10-11: COP 0.062026-10-12: COP 3.782026-10-13: COP 0.022026-10-14: COP 0.032026-10-15: COP 2.932026-10-16: COP 2.772026-10-17: COP 3.562026-10-18: COP 2.472026-10-19: COP 0.042026-10-20: COP 3.372026-10-21: COP 3.592026-10-22: COP 2.292026-10-23: COP 3.592026-10-24: COP 2.792026-10-25: COP 3.762026-10-26: COP 2.962026-10-27: COP 4.242026-10-28: COP 3.182026-10-29: COP 2.832026-10-30: COP 3.572026-10-31: COP 3.222026-11-01: COP 2.542026-11-02: COP 3.312026-11-03: COP 3.32026-11-04: COP 3.422026-11-05: COP 3.072026-11-06: COP 3.252026-11-07: COP 4.0610-0810-1210-1610-2010-2410-2811-0111-05
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
203040506046810121416outdoor 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.