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Home / system #359

Daikin Altherma Split

Isle of Wight · Detached · 300 m² · Pre-1900 · 11 kW · underfloor

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
1.34efficiency (COP) over 721 hours, from the heat meter
better than 0% of the metered fleet in January 2026
Electricity used
67 kWh
Heat delivered
89 kWh (heat meter)
Estimate without heat meter
flow sensor 2.72 · temperature model 3.34
Mean outdoor temperature
6.6 °C · 9 space-heating hours
Flow temperature at 0 °C outside
15.9 °C (curve slope -4.78 per K)
Flow − return while heating
4.0 K
House needs at −3 °C
5.8 kW (unit rated 11 kW) · fit r² 0.01
Hot water
23% of electricity, COP 2.22
infoOnly 9 space-heating hours in this window
Space-heating findings need at least 60 hours with the compressor running below 15 °C outside. Choose a winter window or come back during the heating season.
noteOwner’s note on the source site: “Not main heating source or a holiday home, booster heater not metered”
valueReaching the fleet’s January median (3.69) would have saved about £11 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 day05112026-01-05: 2.2 kWh, outside 0.1 °C2026-01-06: 10.5 kWh, outside 0 °C2026-01-07: 1.5 kWh, outside 4 °C2026-01-08: 1.2 kWh, outside 4.3 °C2026-01-09: 1.3 kWh, outside 4.7 °C2026-01-10: 5.3 kWh, outside 2.4 °C2026-01-11: 4.2 kWh, outside 4.5 °C2026-01-12: 1.3 kWh, outside 10.4 °C2026-01-13: 1.2 kWh, outside 9.6 °C2026-01-14: 1.2 kWh, outside 5.8 °C2026-01-15: 1.3 kWh, outside 8.9 °C2026-01-16: 1.3 kWh, outside 7.3 °C2026-01-17: 4.8 kWh, outside 8.8 °C2026-01-18: 1.3 kWh, outside 9.1 °C2026-01-19: 1.3 kWh, outside 9.4 °C2026-01-20: 1.3 kWh, outside 9.3 °C2026-01-21: 1.3 kWh, outside 8.4 °C2026-01-22: 1.3 kWh, outside 8.9 °C2026-01-23: 1.3 kWh, outside 8 °C2026-01-24: 5 kWh, outside 7.7 °C2026-01-25: 1.2 kWh, outside 7.1 °C2026-01-26: 1.3 kWh, outside 5.6 °C2026-01-27: 1.4 kWh, outside 7.6 °C2026-01-28: 1.3 kWh, outside 5.9 °C2026-01-29: 1.4 kWh, outside 4.5 °C2026-01-30: 1.4 kWh, outside 7.6 °C2026-01-31: 4.9 kWh, outside 8.2 °C2026-02-01: 1.3 kWh, outside 8.1 °C2026-02-02: 1.3 kWh, outside 7.7 °C2026-02-03: 1.3 kWh, outside 5.1 °C2026-02-04: 0.1 kWh, outside 4.4 °Cdaily COP (heat ÷ electricity)1352026-01-05: COP 4.72026-01-06: COP 2.832026-01-07: COP 1.22026-01-08: COP 02026-01-09: COP 02026-01-10: COP 1.542026-01-11: COP 3.072026-01-12: COP 02026-01-13: COP 02026-01-14: COP 02026-01-15: COP 02026-01-16: COP 02026-01-17: COP 1.822026-01-18: COP 02026-01-19: COP 02026-01-20: COP 02026-01-21: COP 02026-01-22: COP 02026-01-23: COP 02026-01-24: COP 1.762026-01-25: COP 02026-01-26: COP 02026-01-27: COP 02026-01-28: COP 02026-01-29: COP 02026-01-30: COP 02026-01-31: COP 1.82026-02-01: COP 02026-02-02: COP 02026-02-03: COP 001-0501-0901-1301-1701-2101-2501-2902-02
Daily COP needs a heat meter; days without one show electricity only.
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.