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Home / system #670

Vaillant Arotherm+

Yelverton, Devon · Bungalow · 166 m² · 1940 to 1982 · 7 kW · radiators · installed by Reco Energy

Last 30 daysLast 7 days5 Jan – 4 Feb 2026 (winter reference)1–31 Dec 2025

Last 7 days

169 hourly rows · MID-class heat meter present: yes
5.20efficiency (COP) over 169 hours, from the heat meter
better than 99% of the metered fleet in January 2026
Electricity used
106 kWh
Heat delivered
550 kWh (heat meter)
Estimate without heat meter
flow sensor 5.25 · temperature model 4.79
Mean outdoor temperature
9.4 °C · 155 space-heating hours
Flow temperature at 0 °C outside
38.1 °C (curve slope -0.81 per K)
Flow − return while heating
3.4 K
House needs at −3 °C
6.8 kW (unit rated 7 kW) · fit r² 0.47
Hot water
10% of electricity, COP 4.07
infoNo configuration faults detected in this window
Keep the current settings. We will alert you if efficiency drifts.

Day by day

electricity per daydaily COP3.0 floor
electricity, kWh per day09182026-10-31: 6.5 kWh, outside 12.3 °C2026-11-01: 15.7 kWh, outside 8.4 °C2026-11-02: 11.7 kWh, outside 10.6 °C2026-11-03: 13.8 kWh, outside 9.7 °C2026-11-04: 16.2 kWh, outside 9.2 °C2026-11-05: 17.8 kWh, outside 8.7 °C2026-11-06: 17.3 kWh, outside 8.5 °C2026-11-07: 6.8 kWh, outside 7.2 °Cdaily COP (heat ÷ electricity)1352026-10-31: COP 5.242026-11-01: COP 4.772026-11-02: COP 5.242026-11-03: COP 5.182026-11-04: COP 5.342026-11-05: COP 5.382026-11-06: COP 5.192026-11-07: COP 5.310-3111-0111-0211-0311-0411-0511-0611-07
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
20304050603579111315outdoor temperature, °Cflow temperature, °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.