745 hourly rows · MID-class heat meter present: no
3.69efficiency (COP) over 745 hours, from the heat meter better than 50% of the metered fleet in January 2026
Electricity used
424 kWh
Heat delivered
1561 kWh (heat meter)
Estimate without heat meter
flow sensor 3.34 · temperature model 3.53
Mean outdoor temperature
7.0 °C · 438 space-heating hours · cooling 114 kWh removed (2 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
40.0 °C (curve slope -0.49 per K)
Flow − return while heating
2.4 K
House needs at −3 °C
5.0 kW (unit rated 7 kW) · fit r² 0.09
Hot water
no hot-water flag in data
warningOnly 2.4 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: “flow rate being detected when heat pump is off”
valueReaching the fleet’s January median (3.69) would have saved about £0 in this window at 0.25 GBP/kWh. An estimate, not a promise.
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.