744 hourly rows · MID-class heat meter present: yes
4.21efficiency (COP) over 744 hours, from the heat meter better than 88% of the metered fleet in January 2026
Electricity used
1041 kWh
Heat delivered
4382 kWh (heat meter)
Estimate without heat meter
flow sensor 4.17 · temperature model 3.17
Mean outdoor temperature
1.5 °C · 544 space-heating hours · cooling 0 kWh removed (0 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
31.2 °C (curve slope -0.05 per K)
Flow − return while heating
4.6 K
House needs at −3 °C
5.8 kW (unit rated 9 kW) · fit r² 0.00
Hot water
41% of electricity, COP 2.82
warningHot water uses 41% of electricity at COP 2.82
Lower the tank target to 45–48 °C, heat water once a day in the warmest hours, and disable weekly legionella cycles unless required.
noteOwner’s note on the source site: “does this system have a booster heater”
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.