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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

1–31 Dec 2025

736 hourly rows · MID-class heat meter present: yes
3.83efficiency (COP) over 736 hours, from the heat meter
better than 64% of the metered fleet in January 2026
Electricity used
300 kWh
Heat delivered
1150 kWh (heat meter)
Estimate without heat meter
flow sensor 3.94 · temperature model 3.76
Mean outdoor temperature
6.9 °C · 205 space-heating hours · cooling 0 kWh removed (0 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
35.6 °C (curve slope -0.44 per K)
Flow − return while heating
4.4 K
House needs at −3 °C
5.1 kW (unit rated 8 kW) · fit r² 0.00
Hot water
17% of electricity, COP 2.85
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 day011212025-12-01: 5.5 kWh, outside 10.1 °C2025-12-02: 10.3 kWh, outside 6.9 °C2025-12-03: 10.6 kWh, outside 4.4 °C2025-12-04: 9.4 kWh, outside 5.8 °C2025-12-05: 14.3 kWh, outside 4.7 °C2025-12-06: 7.5 kWh, outside 8.9 °C2025-12-07: 5.8 kWh, outside 8.5 °C2025-12-08: 6 kWh, outside 9.8 °C2025-12-09: 5.8 kWh, outside 11.9 °C2025-12-10: 5.7 kWh, outside 10.2 °C2025-12-11: 7.1 kWh, outside 9.1 °C2025-12-12: 4.7 kWh, outside 8 °C2025-12-13: 9.2 kWh, outside 6.9 °C2025-12-14: 7.1 kWh, outside 9.9 °C2025-12-15: 5.9 kWh, outside 9.6 °C2025-12-16: 8 kWh, outside 5.8 °C2025-12-17: 12.4 kWh, outside 6.2 °C2025-12-18: 6.7 kWh, outside 9 °C2025-12-19: 8.7 kWh, outside 7.4 °C2025-12-20: 14.3 kWh, outside 4.5 °C2025-12-21: 8.6 kWh, outside 7.4 °C2025-12-22: 8.2 kWh, outside 8 °C2025-12-23: 7.8 kWh, outside 6.6 °C2025-12-24: 14.2 kWh, outside 5.1 °C2025-12-25: 6.1 kWh, outside 4.4 °C2025-12-26: 21.2 kWh, outside 3.1 °C2025-12-27: 15.5 kWh, outside 4.5 °C2025-12-28: 9.2 kWh, outside 5.8 °C2025-12-29: 11.6 kWh, outside 5 °C2025-12-30: 16.9 kWh, outside 3.4 °C2025-12-31: 16.2 kWh, outside 2.4 °C2026-01-01: 0 kWh, outside 4 °Cdaily COP (heat ÷ electricity)1352025-12-01: COP 4.942025-12-02: COP 3.892025-12-03: COP 3.222025-12-04: COP 4.092025-12-05: COP 3.622025-12-06: COP 4.732025-12-07: COP 3.952025-12-08: COP 4.632025-12-09: COP 5.382025-12-10: COP 4.412025-12-11: COP 4.422025-12-12: COP 4.182025-12-13: COP 3.312025-12-14: COP 4.462025-12-15: COP 5.112025-12-16: COP 3.892025-12-17: COP 3.672025-12-18: COP 4.732025-12-19: COP 4.162025-12-20: COP 42025-12-21: COP 4.22025-12-22: COP 4.372025-12-23: COP 3.62025-12-24: COP 3.452025-12-25: COP 2.862025-12-26: COP 3.362025-12-27: COP 3.172025-12-28: COP 3.542025-12-29: COP 3.882025-12-30: COP 3.42025-12-31: COP 2.9712-0112-0512-0912-1312-1712-2112-2512-29
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060-202468101214outdoor 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.