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Home / system #593

Daikin Altherma 3

Wing, Beds · Detached · 140 m² · 2012 or newer · 5 kW · radiators · installed by Self-install

Last 30 daysLast 7 days5 Jan – 4 Feb 2026 (winter reference)1–31 Dec 2025

Last 30 days

720 hourly rows · MID-class heat meter present: yes
3.35efficiency (COP) over 720 hours, from the heat meter
better than 31% of the metered fleet in January 2026
Electricity used
117 kWh
Heat delivered
391 kWh (heat meter)
Estimate without heat meter
flow sensor 4.05 · temperature model 4.73
Mean outdoor temperature
10.2 °C · 281 space-heating hours
Flow temperature at 0 °C outside
37.0 °C (curve slope -0.72 per K)
Flow − return while heating
1.8 K
House needs at −3 °C
1.5 kW (unit rated 5 kW) · fit r² 0.01
Hot water
no hot-water flag in data
warningOnly 1.8 K between flow and return
Circulation pump may be set too high or emitters are undersized for the low flow temperature. Ask the installer to check pump speed.
infoUnit is rated 5 kW but the house needs about 1.5 kW at −3 °C
Oversizing causes cycling in mild weather. Cannot be fixed cheaply now, but the curve and minimum run time can limit the damage.
valueReaching the fleet’s January median (3.69) would have saved about £3 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 day0472026-10-08: 0.4 kWh, outside 11.1 °C2026-10-09: 1.7 kWh, outside 13.7 °C2026-10-10: 2.3 kWh, outside 10.3 °C2026-10-11: 2.9 kWh, outside 10.4 °C2026-10-12: 0.5 kWh, outside 13.6 °C2026-10-13: 0.3 kWh, outside 14.7 °C2026-10-14: 1.9 kWh, outside 12.8 °C2026-10-15: 0.3 kWh, outside 15.7 °C2026-10-16: 1.3 kWh, outside 11.4 °C2026-10-17: 3.5 kWh, outside 8 °C2026-10-18: 4.7 kWh, outside 8.3 °C2026-10-19: 2.9 kWh, outside 9.9 °C2026-10-20: 4.4 kWh, outside 10.7 °C2026-10-21: 7.2 kWh, outside 8 °C2026-10-22: 3.9 kWh, outside 9.5 °C2026-10-23: 5 kWh, outside 9.3 °C2026-10-24: 5.8 kWh, outside 9.2 °C2026-10-25: 5.2 kWh, outside 8.9 °C2026-10-26: 4.4 kWh, outside 11 °C2026-10-27: 2.6 kWh, outside 11.6 °C2026-10-28: 4.4 kWh, outside 10.1 °C2026-10-29: 3.7 kWh, outside 11.3 °C2026-10-30: 3.3 kWh, outside 10.8 °C2026-10-31: 3.9 kWh, outside 9.6 °C2026-11-01: 6.1 kWh, outside 8.4 °C2026-11-02: 5.5 kWh, outside 7.9 °C2026-11-03: 7.1 kWh, outside 7.9 °C2026-11-04: 6.3 kWh, outside 7.9 °C2026-11-05: 6.3 kWh, outside 7.7 °C2026-11-06: 5.7 kWh, outside 8.5 °C2026-11-07: 3.5 kWh, outside 4.8 °Cdaily COP (heat ÷ electricity)1352026-10-09: COP 2.962026-10-10: COP 2.852026-10-11: COP 2.792026-10-14: COP 2.272026-10-16: COP 2.922026-10-17: COP 2.752026-10-18: COP 3.142026-10-19: COP 3.342026-10-20: COP 3.642026-10-21: COP 3.492026-10-22: COP 3.82026-10-23: COP 3.552026-10-24: COP 3.372026-10-25: COP 3.662026-10-26: COP 3.72026-10-27: COP 3.622026-10-28: COP 3.412026-10-29: COP 3.572026-10-30: COP 3.392026-10-31: COP 3.492026-11-01: COP 3.622026-11-02: COP 3.572026-11-03: COP 3.372026-11-04: COP 3.272026-11-05: COP 3.512026-11-06: COP 3.382026-11-07: COP 2.9110-0810-1210-1610-2010-2410-2811-0111-05
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
20304050602468101214outdoor 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.