721 hourly rows · MID-class heat meter present: yes
3.09efficiency (COP) over 721 hours, from the heat meter better than 12% of the metered fleet in January 2026
Electricity used
215 kWh
Heat delivered
664 kWh (heat meter)
Estimate without heat meter
flow sensor 3.01 · temperature model 3.82
Mean outdoor temperature
10.3 °C · 115 space-heating hours · cooling 1 kWh removed (5 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
39.6 °C (curve slope -0.51 per K)
Flow − return while heating
4.2 K
House needs at −3 °C
6.1 kW (unit rated 8 kW) · fit r² 0.01
Hot water
31% of electricity, COP 0.61
warningHot water uses 31% of electricity at COP 0.61
Lower the tank target to 45–48 °C, heat water once a day in the warmest hours, and disable weekly legionella cycles unless required.
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.