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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

Last 30 days

711 hourly rows · MID-class heat meter present: yes
4.48efficiency (COP) over 711 hours, from the heat meter
better than 92% of the metered fleet in January 2026
Electricity used
297 kWh
Heat delivered
1329 kWh (heat meter)
Estimate without heat meter
flow sensor – · temperature model 4.40
Mean outdoor temperature
10.8 °C · 252 space-heating hours
Flow temperature at 0 °C outside
34.5 °C (curve slope -0.08 per K)
Flow − return while heating
3.8 K
House needs at −3 °C
4.4 kW (unit rated 11.2 kW) · fit r² 0.00
Hot water
23% of electricity, COP 4.13
infoUnit is rated 11.2 kW but the house needs about 4.4 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
electricity, kWh per day09192026-10-08: 6.7 kWh, outside 11.5 °C2026-10-09: 4.8 kWh, outside 13.2 °C2026-10-10: 10.9 kWh, outside 11 °C2026-10-11: 7 kWh, outside 9.7 °C2026-10-12: 7.2 kWh, outside 12.3 °C2026-10-13: 5.3 kWh, outside 14.8 °C2026-10-14: 5.8 kWh, outside 12.6 °C2026-10-15: 4.2 kWh, outside 14.8 °C2026-10-16: 6.2 kWh, outside 9.8 °C2026-10-17: 9.8 kWh, outside 9.4 °C2026-10-18: 12 kWh, outside 9.6 °C2026-10-19: 6.9 kWh, outside 12.6 °C2026-10-20: 7.8 kWh, outside 11.8 °C2026-10-21: 9.3 kWh, outside 10.3 °C2026-10-22: 10.1 kWh, outside 9.1 °C2026-10-23: 10.1 kWh, outside 10.2 °C2026-10-24: 14.6 kWh, outside 8.6 °C2026-10-25: 18.6 kWh, outside 10.7 °C2026-10-26: 11.3 kWh, outside 11.5 °C2026-10-27: 7.3 kWh, outside 13 °C2026-10-28: 10 kWh, outside 11.6 °C2026-10-29: 9.2 kWh, outside 11 °C2026-10-30: 11.2 kWh, outside 9.4 °C2026-10-31: 9.8 kWh, outside 9 °C2026-11-01: 17 kWh, outside 6.8 °C2026-11-02: 14.3 kWh, outside 8.3 °C2026-11-03: 12.2 kWh, outside 9.9 °C2026-11-04: 10.4 kWh, outside 10.2 °C2026-11-05: 14.1 kWh, outside 10.2 °C2026-11-06: 12.6 kWh, outside 10 °Cdaily COP (heat ÷ electricity)1352026-10-08: COP 4.392026-10-09: COP 4.982026-10-10: COP 4.492026-10-11: COP 3.872026-10-12: COP 4.582026-10-13: COP 4.072026-10-14: COP 4.272026-10-15: COP 4.372026-10-16: COP 4.272026-10-17: COP 4.582026-10-18: COP 4.452026-10-19: COP 4.962026-10-20: COP 4.692026-10-21: COP 4.632026-10-22: COP 4.162026-10-23: COP 4.692026-10-24: COP 4.32026-10-25: COP 4.432026-10-26: COP 4.432026-10-27: COP 4.622026-10-28: COP 4.712026-10-29: COP 4.622026-10-30: COP 4.552026-10-31: COP 4.572026-11-01: COP 4.162026-11-02: COP 4.372026-11-03: COP 4.672026-11-04: COP 4.742026-11-05: COP 4.532026-11-06: COP 4.4110-0810-1210-1610-2010-2410-2811-0111-05
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
203040506013579111315outdoor 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.