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Home / system #419

Daikin Altherma 3

Dundee · Semi-detached · 102 m² · 2012 or newer · 6 kW · radiators · installed by The Natural Energy Company

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
3.10efficiency (COP) over 721 hours, from the heat meter
better than 12% of the metered fleet in January 2026
Electricity used
455 kWh
Heat delivered
1412 kWh (heat meter)
Estimate without heat meter
flow sensor 3.20 · temperature model 3.27
Mean outdoor temperature
3.3 °C · 545 space-heating hours
Flow temperature at 0 °C outside
35.4 °C (curve slope 0.23 per K)
Flow − return while heating
3.9 K
House needs at −3 °C
2.4 kW (unit rated 6 kW) · fit r² 0.00
Hot water
no hot-water flag in data
infoUnit is rated 6 kW but the house needs about 2.4 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.
noteOwner’s note on the source site: “Negative heat not reported”
valueReaching the fleet’s January median (3.69) would have saved about £18 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 day012242026-01-05: 23.7 kWh, outside -1.7 °C2026-01-06: 20.9 kWh, outside 0.3 °C2026-01-07: 15 kWh, outside 2.2 °C2026-01-08: 20 kWh, outside -2 °C2026-01-09: 17.2 kWh, outside -1.3 °C2026-01-10: 14.7 kWh, outside 0.8 °C2026-01-11: 16.7 kWh, outside 4.3 °C2026-01-12: 11.2 kWh, outside 7.7 °C2026-01-13: 15.6 kWh, outside 3.1 °C2026-01-14: 17.6 kWh, outside 3.7 °C2026-01-15: 13.3 kWh, outside 3.6 °C2026-01-16: 16.5 kWh, outside -0.7 °C2026-01-17: 14.4 kWh, outside 3.1 °C2026-01-18: 17.1 kWh, outside 3 °C2026-01-19: 16.5 kWh, outside 2.6 °C2026-01-20: 12 kWh, outside 6.2 °C2026-01-21: 12 kWh, outside 6.2 °C2026-01-22: 12.3 kWh, outside 5.9 °C2026-01-23: 12.4 kWh, outside 4.6 °C2026-01-24: 11.6 kWh, outside 5 °C2026-01-25: 13.5 kWh, outside 4.9 °C2026-01-26: 15.9 kWh, outside 3.7 °C2026-01-27: 14.9 kWh, outside 3.7 °C2026-01-28: 12.2 kWh, outside 5.4 °C2026-01-29: 14.4 kWh, outside 4.2 °C2026-01-30: 18.1 kWh, outside 3.5 °C2026-01-31: 14.8 kWh, outside 5.2 °C2026-02-01: 12.7 kWh, outside 5.4 °C2026-02-02: 13.7 kWh, outside 4.2 °C2026-02-03: 13.2 kWh, outside 2.9 °C2026-02-04: 0.7 kWh, outside 2.6 °Cdaily COP (heat ÷ electricity)1352026-01-05: COP 2.72026-01-06: COP 2.762026-01-07: COP 2.992026-01-08: COP 2.532026-01-09: COP 2.712026-01-10: COP 2.922026-01-11: COP 3.132026-01-12: COP 3.272026-01-13: COP 3.012026-01-14: COP 3.162026-01-15: COP 3.072026-01-16: COP 2.722026-01-17: COP 3.332026-01-18: COP 3.332026-01-19: COP 3.222026-01-20: COP 3.552026-01-21: COP 3.512026-01-22: COP 3.262026-01-23: COP 3.122026-01-24: COP 3.22026-01-25: COP 3.382026-01-26: COP 3.182026-01-27: COP 3.252026-01-28: COP 3.242026-01-29: COP 2.922026-01-30: COP 3.312026-01-31: COP 3.342026-02-01: COP 3.32026-02-02: COP 3.552026-02-03: COP 3.122026-02-04: COP 3.1801-0501-0901-1301-1701-2101-2501-2902-02
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060-5-3-113579outdoor 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.