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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

5 Jan – 4 Feb 2026 (winter reference)

721 hourly rows · MID-class heat meter present: yes
3.53efficiency (COP) over 721 hours, from the heat meter
better than 38% of the metered fleet in January 2026
Electricity used
739 kWh
Heat delivered
2612 kWh (heat meter)
Estimate without heat meter
flow sensor – · temperature model 3.26
Mean outdoor temperature
4.6 °C · 554 space-heating hours
Flow temperature at 0 °C outside
37.9 °C (curve slope -0.30 per K)
Flow − return while heating
5.9 K
House needs at −3 °C
5.0 kW (unit rated 11.2 kW) · fit r² 0.03
Hot water
7% of electricity, COP 3.24
infoUnit is rated 11.2 kW but the house needs about 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.
noteOwner’s note on the source site: “Defrost energy not included due to mitsubishi heat meter integration limitation.”
valueReaching the fleet’s January median (3.69) would have saved about £8 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 day021422026-01-05: 42.2 kWh, outside -1.3 °C2026-01-06: 41.2 kWh, outside -0.3 °C2026-01-07: 32.9 kWh, outside 3.2 °C2026-01-08: 37.1 kWh, outside 0.8 °C2026-01-09: 26.1 kWh, outside 3.3 °C2026-01-10: 35 kWh, outside 0.7 °C2026-01-11: 30.8 kWh, outside 3.5 °C2026-01-12: 16.8 kWh, outside 8.5 °C2026-01-13: 20.2 kWh, outside 6.2 °C2026-01-14: 28 kWh, outside 2.1 °C2026-01-15: 22.8 kWh, outside 4.6 °C2026-01-16: 23.3 kWh, outside 4.3 °C2026-01-17: 18.4 kWh, outside 6.1 °C2026-01-18: 18.9 kWh, outside 5.9 °C2026-01-19: 14.2 kWh, outside 7.6 °C2026-01-20: 17.1 kWh, outside 8.1 °C2026-01-21: 18.2 kWh, outside 7 °C2026-01-22: 18 kWh, outside 6.3 °C2026-01-23: 20 kWh, outside 6.8 °C2026-01-24: 18.8 kWh, outside 6.1 °C2026-01-25: 21.9 kWh, outside 5.2 °C2026-01-26: 26.3 kWh, outside 3.4 °C2026-01-27: 27.9 kWh, outside 4.9 °C2026-01-28: 27.9 kWh, outside 3.6 °C2026-01-29: 24.1 kWh, outside 4.1 °C2026-01-30: 25 kWh, outside 4.6 °C2026-01-31: 19.7 kWh, outside 6.7 °C2026-02-01: 17.7 kWh, outside 6.6 °C2026-02-02: 18.7 kWh, outside 6.1 °C2026-02-03: 30.1 kWh, outside 3.6 °C2026-02-04: 0.2 kWh, outside 3 °Cdaily COP (heat ÷ electricity)1352026-01-05: COP 2.822026-01-06: COP 2.952026-01-07: COP 3.292026-01-08: COP 2.942026-01-09: COP 3.42026-01-10: COP 2.912026-01-11: COP 3.362026-01-12: COP 4.142026-01-13: COP 3.762026-01-14: COP 3.272026-01-15: COP 3.72026-01-16: COP 3.562026-01-17: COP 42026-01-18: COP 3.882026-01-19: COP 4.212026-01-20: COP 4.122026-01-21: COP 4.052026-01-22: COP 4.092026-01-23: COP 4.092026-01-24: COP 4.032026-01-25: COP 3.82026-01-26: COP 3.442026-01-27: COP 3.682026-01-28: COP 3.382026-01-29: COP 3.512026-01-30: COP 3.662026-01-31: COP 4.12026-02-01: COP 3.972026-02-02: COP 3.962026-02-03: COP 3.4101-0501-0901-1301-1701-2101-2501-2902-02
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060-7-5-3-11357911outdoor 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.