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Home / system #539

Vaillant Arotherm+

Great Bedwyn, Wiltshire · Semi-detached · 117 m² · 1940 to 1982 · 7 kW · underfloor · installed by Ramsbury Electrical

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

5 Jan – 4 Feb 2026 (winter reference)

721 hourly rows · MID-class heat meter present: yes
3.91efficiency (COP) over 721 hours, from the heat meter
better than 66% of the metered fleet in January 2026
Electricity used
511 kWh
Heat delivered
1997 kWh (heat meter)
Estimate without heat meter
flow sensor 3.72 · temperature model 3.65
Mean outdoor temperature
5.7 °C · 637 space-heating hours
Flow temperature at 0 °C outside
37.1 °C (curve slope -0.80 per K)
Flow − return while heating
2.3 K
House needs at −3 °C
4.2 kW (unit rated 7 kW) · fit r² 0.65
Hot water
21% of electricity, COP 3.38
warningOnly 2.3 K between flow and return
Circulation pump may be set too high or emitters are undersized for the low flow temperature. Ask the installer to check pump speed.

Day by day

electricity per daydaily COP3.0 floor
electricity, kWh per day017342026-01-05: 30.4 kWh, outside -0.9 °C2026-01-06: 34.1 kWh, outside 0.4 °C2026-01-07: 24.2 kWh, outside 3.5 °C2026-01-08: 19.6 kWh, outside 4.3 °C2026-01-09: 22.3 kWh, outside 2.9 °C2026-01-10: 29.8 kWh, outside 0.1 °C2026-01-11: 19.8 kWh, outside 5.3 °C2026-01-12: 11.5 kWh, outside 10 °C2026-01-13: 11.5 kWh, outside 8.9 °C2026-01-14: 22.4 kWh, outside 3.4 °C2026-01-15: 13.6 kWh, outside 7.5 °C2026-01-16: 15.1 kWh, outside 5.5 °C2026-01-17: 13 kWh, outside 6.9 °C2026-01-18: 12.9 kWh, outside 7 °C2026-01-19: 11.5 kWh, outside 8.7 °C2026-01-20: 12.3 kWh, outside 8 °C2026-01-21: 13.6 kWh, outside 7.3 °C2026-01-22: 11.5 kWh, outside 8.4 °C2026-01-23: 13.4 kWh, outside 6.7 °C2026-01-24: 14.3 kWh, outside 7 °C2026-01-25: 14.2 kWh, outside 6.2 °C2026-01-26: 14.9 kWh, outside 5.6 °C2026-01-27: 13.9 kWh, outside 7.1 °C2026-01-28: 16.4 kWh, outside 4.8 °C2026-01-29: 21.2 kWh, outside 3.9 °C2026-01-30: 13.1 kWh, outside 7.3 °C2026-01-31: 14.4 kWh, outside 6.9 °C2026-02-01: 13.1 kWh, outside 7.3 °C2026-02-02: 14.4 kWh, outside 6.2 °C2026-02-03: 17 kWh, outside 4.5 °C2026-02-04: 1.6 kWh, outside 3.1 °Cdaily COP (heat ÷ electricity)1352026-01-05: COP 2.982026-01-06: COP 2.92026-01-07: COP 3.482026-01-08: COP 3.82026-01-09: COP 3.462026-01-10: COP 2.942026-01-11: COP 3.772026-01-12: COP 4.762026-01-13: COP 4.622026-01-14: COP 3.272026-01-15: COP 4.422026-01-16: COP 4.122026-01-17: COP 4.442026-01-18: COP 4.492026-01-19: COP 4.532026-01-20: COP 4.432026-01-21: COP 4.482026-01-22: COP 4.532026-01-23: COP 4.412026-01-24: COP 4.32026-01-25: COP 4.312026-01-26: COP 4.282026-01-27: COP 4.412026-01-28: COP 4.162026-01-29: COP 3.532026-01-30: COP 4.412026-01-31: COP 4.472026-02-01: COP 4.462026-02-02: COP 4.382026-02-03: COP 4.22026-02-04: COP 3.1701-0501-0901-1301-1701-2101-2501-2902-02
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060-7-4-125811outdoor 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.