745 hourly rows · MID-class heat meter present: no
4.20efficiency (COP) over 745 hours, from the heat meter better than 88% of the metered fleet in January 2026
Electricity used
600 kWh
Heat delivered
2520 kWh (heat meter)
Estimate without heat meter
flow sensor 4.29 · temperature model 3.72
Mean outdoor temperature
6.8 °C · 607 space-heating hours
Flow temperature at 0 °C outside
36.3 °C (curve slope -0.38 per K)
Flow − return while heating
4.9 K
House needs at −3 °C
4.8 kW (unit rated 8 kW) · fit r² 0.28
Hot water
32% of electricity, COP 3.64
warningHot water uses 32% of electricity at COP 3.64
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.