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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

Last 7 days

169 hourly rows · MID-class heat meter present: yes
0.00efficiency (COP) over 169 hours, from the heat meter
better than 0% of the metered fleet in January 2026
Electricity used
12 kWh
Heat delivered
0 kWh (heat meter)
Estimate without heat meter
flow sensor – · temperature model –
Mean outdoor temperature
10.1 °C · 0 space-heating hours
Flow temperature at 0 °C outside
–
Flow − return while heating
– K
House needs at −3 °C
–
Hot water
no hot-water flag in data
infoOnly 0 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”

Day by day

electricity per daydaily COP3.0 floor
electricity, kWh per day0122026-10-31: 0.8 kWh, outside 12.2 °C2026-11-01: 1.6 kWh, outside 10.2 °C2026-11-02: 1.7 kWh, outside 10.3 °C2026-11-03: 1.7 kWh, outside 10.2 °C2026-11-04: 1.9 kWh, outside 10 °C2026-11-05: 1.9 kWh, outside 9.9 °C2026-11-06: 1.9 kWh, outside 10 °C2026-11-07: 0.7 kWh, outside 5.4 °Cdaily COP (heat ÷ electricity)1352026-10-31: COP 02026-11-01: COP 02026-11-02: COP 02026-11-03: COP 02026-11-04: COP 02026-11-05: COP 02026-11-06: COP 02026-11-07: COP 010-3111-0111-0211-0311-0411-0511-0611-07
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.