721 hourly rows · MID-class heat meter present: yes
3.67efficiency (COP) over 721 hours, from the heat meter better than 50% of the metered fleet in January 2026
Electricity used
917 kWh
Heat delivered
3367 kWh (heat meter)
Estimate without heat meter
flow sensor 2.44 · temperature model 3.19
Mean outdoor temperature
4.4 °C · 464 space-heating hours
Flow temperature at 0 °C outside
44.2 °C (curve slope -0.59 per K)
Flow − return while heating
5.8 K
House needs at −3 °C
6.2 kW (unit rated 12 kW) · fit r² 0.14
Hot water
50% of electricity, COP 3.20
warningHot water uses 50% of electricity at COP 3.2
Lower the tank target to 45–48 °C, heat water once a day in the warmest hours, and disable weekly legionella cycles unless required.
noteOwner’s note on the source site: “0W standby power review required”
valueReaching the fleet’s January median (3.69) would have saved about £1 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.