745 hourly rows · MID-class heat meter present: yes
4.18efficiency (COP) over 745 hours, from the heat meter better than 86% of the metered fleet in January 2026
Electricity used
508 kWh
Heat delivered
2124 kWh (heat meter)
Estimate without heat meter
flow sensor 3.73 · temperature model 4.69
Mean outdoor temperature
8.2 °C · 484 space-heating hours
Flow temperature at 0 °C outside
32.2 °C (curve slope -0.41 per K)
Flow − return while heating
2.0 K
House needs at −3 °C
5.8 kW (unit rated 10 kW) · fit r² 0.37
Hot water
29% of electricity, COP 3.89
warningOnly 2 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.
noteOwner’s note on the source site: “Negative heat during defrosts not reported”
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.