745 hourly rows · MID-class heat meter present: yes
4.54efficiency (COP) over 745 hours, from the heat meter better than 94% of the metered fleet in January 2026
Electricity used
603 kWh
Heat delivered
2738 kWh (heat meter)
Estimate without heat meter
flow sensor 4.72 · temperature model 4.21
Mean outdoor temperature
7.2 °C · 679 space-heating hours
Flow temperature at 0 °C outside
34.3 °C (curve slope -0.33 per K)
Flow − return while heating
2.7 K
House needs at −3 °C
5.0 kW (unit rated 9 kW) · fit r² 0.34
Hot water
13% of electricity, COP 3.99
warningOnly 2.7 K between flow and return
Circulation pump may be set too high or emitters are undersized for the low flow temperature. Ask the installer to check pump speed.
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.