721 hourly rows · MID-class heat meter present: yes
2.96efficiency (COP) over 721 hours, from the heat meter better than 8% of the metered fleet in January 2026
Electricity used
374 kWh
Heat delivered
1105 kWh (heat meter)
Estimate without heat meter
flow sensor 2.60 · temperature model 4.04
Mean outdoor temperature
11.7 °C · 188 space-heating hours · cooling 4 kWh removed (1 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
38.2 °C (curve slope -0.23 per K)
Flow − return while heating
3.1 K
House needs at −3 °C
6.9 kW (unit rated 11 kW) · fit r² 0.03
Hot water
25% of electricity, COP 2.32
seriousWinter efficiency 2.96 is below the 3.0 floor used for German subsidies
Ask the installer for a commissioning check; the causes are usually flow temperature, hot water settings, or sizing, all listed below.
valueReaching the fleet’s January median (3.69) would have saved about £19 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.