721 hourly rows · MID-class heat meter present: no
3.79efficiency (COP) over 721 hours, from the heat meter better than 59% of the metered fleet in January 2026
Electricity used
188 kWh
Heat delivered
712 kWh (heat meter)
Estimate without heat meter
flow sensor 3.84 · temperature model 4.22
Mean outdoor temperature
11.0 °C · 184 space-heating hours · cooling 1 kWh removed (0 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
38.9 °C (curve slope -0.46 per K)
Flow − return while heating
4.6 K
House needs at −3 °C
4.1 kW (unit rated 4 kW) · fit r² 0.08
Hot water
32% of electricity, COP 3.29
warningHot water uses 32% of electricity at COP 3.29
Lower the tank target to 45–48 °C, heat water once a day in the warmest hours, and disable weekly legionella cycles unless required.
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.