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Mitsubishi Ecodan

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

Last 30 days Last 7 days 5 Jan – 4 Feb 2026 (winter reference)1–31 Dec 2025

Last 7 days

160 hourly rows · MID-class heat meter present: yes

4.46efficiency (COP) over 160 hours, from the heat meter
better than 92% of the metered fleet in January 2026

Electricity used: 87 kWh
Heat delivered: 390 kWh (heat meter)
Estimate without heat meter: flow sensor – · temperature model 4.12
Mean outdoor temperature: 9.2 °C · 68 space-heating hours
Flow temperature at 0 °C outside: 31.8 °C (curve slope 0.30 per K)
Flow − return while heating: 4.1 K
House needs at −3 °C: 3.4 kW (unit rated 11.2 kW) · fit r² 0.02
Hot water: 21% of electricity, COP 4.13

infoUnit is rated 11.2 kW but the house needs about 3.4 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: “Defrost energy not included due to mitsubishi heat meter integration limitation.”

Day by day

electricity per daydaily COP3.0 floor

Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °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.