Home / system #169
Vaillant Arotherm Split
Swanage, Dorset · Mid-terrace · 70 m² · Pre-1900 · 7 kW · radiators · installed by Inafix
Last 7 days
169 hourly rows · MID-class heat meter present: yes
4.71efficiency (COP) over 169 hours, from the heat meter
better than 97% of the metered fleet in January 2026
better than 97% of the metered fleet in January 2026
- Electricity used
- 19 kWh
- Heat delivered
- 90 kWh (heat meter)
- Estimate without heat meter
- flow sensor 4.65 · temperature model 5.21
- Mean outdoor temperature
- 10.0 °C · 14 space-heating hours
- Flow temperature at 0 °C outside
- 34.5 °C (curve slope -0.47 per K)
- Flow − return while heating
- 1.8 K
- House needs at −3 °C
- 1.6 kW (unit rated 7 kW) · fit r² 0.00
- Hot water
- no hot-water flag in data
infoOnly 14 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.
noteOwner’s note on the source site: “No heat on hot water due to split system”
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.