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Home / system #1

Mitsubishi Ecodan

Selby, Yorkshire · Detached · 134 m² · 1940 to 1982 · 11.2 kW · radiators · installed by Green Building Renewables

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

1–31 Dec 2025

744 hourly rows · MID-class heat meter present: yes
3.88efficiency (COP) over 744 hours, from the heat meter
better than 65% of the metered fleet in January 2026
Electricity used
547 kWh
Heat delivered
2120 kWh (heat meter)
Estimate without heat meter
flow sensor – · temperature model 3.59
Mean outdoor temperature
7.2 °C · 464 space-heating hours
Flow temperature at 0 °C outside
36.1 °C (curve slope 0.02 per K)
Flow − return while heating
5.8 K
House needs at −3 °C
4.6 kW (unit rated 11.2 kW) · fit r² 0.01
Hot water
7% of electricity, COP 3.41
infoUnit is rated 11.2 kW but the house needs about 4.6 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: “Defrost energy not included due to mitsubishi heat meter integration limitation.”

Day by day

electricity per daydaily COP3.0 floor
electricity, kWh per day014282025-12-01: 13.1 kWh, outside 10.1 °C2025-12-02: 17.2 kWh, outside 7.1 °C2025-12-03: 18.9 kWh, outside 4.5 °C2025-12-04: 16.9 kWh, outside 6.6 °C2025-12-05: 19.5 kWh, outside 5.2 °C2025-12-06: 15 kWh, outside 9.2 °C2025-12-07: 14.3 kWh, outside 9.1 °C2025-12-08: 15 kWh, outside 9.5 °C2025-12-09: 9 kWh, outside 12.2 °C2025-12-10: 13.2 kWh, outside 10.2 °C2025-12-11: 14.5 kWh, outside 9 °C2025-12-12: 13.9 kWh, outside 8.2 °C2025-12-13: 21.1 kWh, outside 5.8 °C2025-12-14: 14.1 kWh, outside 9.8 °C2025-12-15: 12.1 kWh, outside 10.2 °C2025-12-16: 15.8 kWh, outside 5.9 °C2025-12-17: 21.5 kWh, outside 6.2 °C2025-12-18: 16.7 kWh, outside 9.2 °C2025-12-19: 19.3 kWh, outside 6.8 °C2025-12-20: 19 kWh, outside 5.3 °C2025-12-21: 14 kWh, outside 8.4 °C2025-12-22: 13.8 kWh, outside 8.7 °C2025-12-23: 16.1 kWh, outside 7.6 °C2025-12-24: 20.4 kWh, outside 6 °C2025-12-25: 20.7 kWh, outside 5.3 °C2025-12-26: 24.1 kWh, outside 4 °C2025-12-27: 25.1 kWh, outside 4.6 °C2025-12-28: 19.5 kWh, outside 6.9 °C2025-12-29: 19.7 kWh, outside 6 °C2025-12-30: 24.8 kWh, outside 3.8 °C2025-12-31: 28.3 kWh, outside 2.5 °C2026-01-01: 0.1 kWh, outside 5 °Cdaily COP (heat ÷ electricity)1352025-12-01: COP 4.232025-12-02: COP 3.952025-12-03: COP 3.712025-12-04: COP 3.982025-12-05: COP 3.762025-12-06: COP 4.242025-12-07: COP 4.212025-12-08: COP 4.192025-12-09: COP 4.592025-12-10: COP 4.182025-12-11: COP 4.132025-12-12: COP 4.12025-12-13: COP 3.692025-12-14: COP 4.222025-12-15: COP 4.232025-12-16: COP 3.742025-12-17: COP 3.642025-12-18: COP 4.212025-12-19: COP 3.932025-12-20: COP 3.642025-12-21: COP 4.32025-12-22: COP 4.232025-12-23: COP 4.162025-12-24: COP 3.832025-12-25: COP 3.832025-12-26: COP 3.552025-12-27: COP 3.532025-12-28: COP 3.872025-12-29: COP 3.832025-12-30: COP 3.42025-12-31: COP 3.2312-0112-0512-0912-1312-1712-2112-2512-29
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060-3-113579111315outdoor 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.