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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

1–31 Dec 2025

745 hourly rows · MID-class heat meter present: yes
2.99efficiency (COP) over 745 hours, from the heat meter
better than 8% of the metered fleet in January 2026
Electricity used
396 kWh
Heat delivered
1183 kWh (heat meter)
Estimate without heat meter
flow sensor 3.23 · temperature model 3.35
Mean outdoor temperature
8.4 °C · 144 space-heating hours
Flow temperature at 0 °C outside
44.8 °C (curve slope -0.87 per K)
Flow − return while heating
3.4 K
House needs at −3 °C
7.9 kW (unit rated 11 kW) · fit r² 0.08
Hot water
24% of electricity, COP 2.85
seriousWinter efficiency 2.99 is below the 3.0 floor used for German subsidies
Ask the installer for a commissioning check; the causes are usually flow temperature, hot water settings, or sizing, all listed below.
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 £19 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 day028552025-12-01: 1.4 kWh, outside 10.4 °C2025-12-02: 1.3 kWh, outside 9.2 °C2025-12-03: 1.4 kWh, outside 7.3 °C2025-12-04: 1.2 kWh, outside 7.2 °C2025-12-05: 1.5 kWh, outside 5.7 °C2025-12-06: 4.7 kWh, outside 10.9 °C2025-12-07: 1.3 kWh, outside 11.2 °C2025-12-08: 1.5 kWh, outside 12.3 °C2025-12-09: 1.2 kWh, outside 13.3 °C2025-12-10: 1.4 kWh, outside 11.5 °C2025-12-11: 1.4 kWh, outside 9.9 °C2025-12-12: 1.3 kWh, outside 10.7 °C2025-12-13: 4.6 kWh, outside 7.1 °C2025-12-14: 1.4 kWh, outside 8.8 °C2025-12-15: 1.4 kWh, outside 11.1 °C2025-12-16: 1.1 kWh, outside 10.3 °C2025-12-17: 1.4 kWh, outside 6.6 °C2025-12-18: 1.3 kWh, outside 11.3 °C2025-12-19: 1.3 kWh, outside 9.1 °C2025-12-20: 33.2 kWh, outside 7.3 °C2025-12-21: 37.2 kWh, outside 9.7 °C2025-12-22: 29.4 kWh, outside 10 °C2025-12-23: 39.8 kWh, outside 7.7 °C2025-12-24: 48.9 kWh, outside 5.6 °C2025-12-25: 55.2 kWh, outside 4.4 °C2025-12-26: 54.9 kWh, outside 5.1 °C2025-12-27: 47.7 kWh, outside 5.8 °C2025-12-28: 13.8 kWh, outside 7.2 °C2025-12-29: 1.2 kWh, outside 6.1 °C2025-12-30: 1.2 kWh, outside 5.2 °C2025-12-31: 1.3 kWh, outside 1.7 °C2026-01-01: 0.1 kWh, outside 0.1 °Cdaily COP (heat ÷ electricity)1352025-12-01: COP 02025-12-02: COP 02025-12-03: COP 02025-12-04: COP 02025-12-05: COP 02025-12-06: COP 1.62025-12-07: COP 02025-12-08: COP 02025-12-09: COP 02025-12-10: COP 02025-12-11: COP 02025-12-12: COP 02025-12-13: COP 1.62025-12-14: COP 02025-12-15: COP 02025-12-16: COP 02025-12-17: COP 02025-12-18: COP 02025-12-19: COP 02025-12-20: COP 3.582025-12-21: COP 3.672025-12-22: COP 3.652025-12-23: COP 3.42025-12-24: COP 3.152025-12-25: COP 2.982025-12-26: COP 2.892025-12-27: COP 3.142025-12-28: COP 3.072025-12-29: COP 02025-12-30: COP 02025-12-31: COP 012-0112-0512-0912-1312-1712-2112-2512-29
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
20304050602345678910111213outdoor 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.