745 hourly rows · MID-class heat meter present: yes
3.95efficiency (COP) over 745 hours, from the heat meter better than 72% of the metered fleet in January 2026
Electricity used
614 kWh
Heat delivered
2422 kWh (heat meter)
Estimate without heat meter
flow sensor 3.59 · temperature model 3.36
Mean outdoor temperature
7.6 °C · 505 space-heating hours
Flow temperature at 0 °C outside
37.3 °C (curve slope 0.06 per K)
Flow − return while heating
3.9 K
House needs at −3 °C
4.0 kW (unit rated 11.2 kW) · fit r² 0.00
Hot water
16% of electricity, COP 3.94
infoUnit is rated 11.2 kW but the house needs about 4 kW at −3 °C
Oversizing causes cycling in mild weather. Cannot be fixed cheaply now, but the curve and minimum run time can limit the damage.
noteOwner’s note on the source site: “Not recording negative heat on heat meter”
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.