721 hourly rows · MID-class heat meter present: yes
3.18efficiency (COP) over 721 hours, from the heat meter better than 24% of the metered fleet in January 2026
Electricity used
241 kWh
Heat delivered
767 kWh (heat meter)
Estimate without heat meter
flow sensor 3.15 · temperature model 3.54
Mean outdoor temperature
8.3 °C · 246 space-heating hours
Flow temperature at 0 °C outside
40.6 °C (curve slope -0.06 per K)
Flow − return while heating
4.7 K
House needs at −3 °C
1.5 kW (unit rated 6 kW) · fit r² 0.12
Hot water
no hot-water flag in data
infoUnit is rated 6 kW but the house needs about 1.5 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 £8 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.