745 hourly rows · MID-class heat meter present: yes
3.32efficiency (COP) over 745 hours, from the heat meter better than 27% of the metered fleet in January 2026
Electricity used
341 kWh
Heat delivered
1134 kWh (heat meter)
Estimate without heat meter
flow sensor 3.26 · temperature model 3.56
Mean outdoor temperature
5.5 °C · 408 space-heating hours
Flow temperature at 0 °C outside
34.1 °C (curve slope 0.19 per K)
Flow − return while heating
3.8 K
House needs at −3 °C
2.5 kW (unit rated 6 kW) · fit r² 0.00
Hot water
no hot-water flag in data
infoUnit is rated 6 kW but the house needs about 2.5 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: “Negative heat not reported”
valueReaching the fleet’s January median (3.69) would have saved about £9 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.