Home / system #1249
Viessmann Vitocal 150A
Bentlawnt, Shropshire · Detached · 140 m² · 2012 or newer · 10 kW · underfloor · installed by Josh Stead
Last 7 days
73 hourly rows · MID-class heat meter present: yes
5.27efficiency (COP) over 73 hours, from the heat meter
better than 99% of the metered fleet in January 2026
better than 99% of the metered fleet in January 2026
- Electricity used
- 44 kWh
- Heat delivered
- 229 kWh (heat meter)
- Estimate without heat meter
- flow sensor 5.34 · temperature model 4.44
- Mean outdoor temperature
- 7.9 °C · 57 space-heating hours · cooling 0 kWh removed (0 kWh electricity), kept out of the COP
- Flow temperature at 0 °C outside
- 30.6 °C (curve slope -0.01 per K)
- Flow − return while heating
- 3.8 K
- House needs at −3 °C
- 2.8 kW (unit rated 10 kW) · fit r² 0.00
- Hot water
- 16% of electricity, COP 4.38
infoOnly 57 space-heating hours in this window
Space-heating findings need at least 60 hours with the compressor running below 15 °C outside. Choose a winter window or come back during the heating season.
Day by day
electricity per daydaily COP3.0 floor
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.