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Home / system #909

Vaillant Arotherm+

Wetherby, West Yorkshire · Detached · 100 m² · 1983 to 2011 · 7 kW · radiators · installed by Clear Skies Energy Ltd

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

1–31 Dec 2025

633 hourly rows · MID-class heat meter present: yes
3.52efficiency (COP) over 633 hours, from the heat meter
better than 38% of the metered fleet in January 2026
Electricity used
638 kWh
Heat delivered
2246 kWh (heat meter)
Estimate without heat meter
flow sensor 3.51 · temperature model 3.50
Mean outdoor temperature
7.0 °C · 458 space-heating hours · cooling 3 kWh removed (12 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
36.2 °C (curve slope -0.10 per K)
Flow − return while heating
3.2 K
House needs at −3 °C
6.4 kW (unit rated 7 kW) · fit r² 0.12
Hot water
13% of electricity, COP 2.19
infoNo configuration faults detected in this window
Keep the current settings. We will alert you if efficiency drifts.
valueReaching the fleet’s January median (3.69) would have saved about £7 in this window at 0.25 GBP/kWh. An estimate, not a promise.

Day by day

electricity per daydaily COP3.0 floor
electricity, kWh per day025502025-12-05: 17.7 kWh, outside 5.9 °C2025-12-06: 22.3 kWh, outside 8.9 °C2025-12-07: 19.3 kWh, outside 8.7 °C2025-12-08: 18.7 kWh, outside 9.7 °C2025-12-09: 13 kWh, outside 12 °C2025-12-10: 11.2 kWh, outside 10.3 °C2025-12-11: 18.5 kWh, outside 9 °C2025-12-12: 19.6 kWh, outside 7.8 °C2025-12-13: 26.2 kWh, outside 6.6 °C2025-12-14: 16.5 kWh, outside 10.2 °C2025-12-15: 15.7 kWh, outside 9.8 °C2025-12-16: 23.8 kWh, outside 5.4 °C2025-12-17: 28.1 kWh, outside 5.9 °C2025-12-18: 19.7 kWh, outside 9.1 °C2025-12-19: 23.8 kWh, outside 7.5 °C2025-12-20: 30.7 kWh, outside 4.5 °C2025-12-21: 19.9 kWh, outside 7.9 °C2025-12-22: 20 kWh, outside 8.4 °C2025-12-23: 22.1 kWh, outside 7.1 °C2025-12-24: 12.9 kWh, outside 5.4 °C2025-12-25: 9.7 kWh, outside 4.9 °C2025-12-26: 41.6 kWh, outside 3 °C2025-12-27: 40.4 kWh, outside 4.2 °C2025-12-28: 30.8 kWh, outside 6.2 °C2025-12-29: 32.6 kWh, outside 5.2 °C2025-12-30: 44.4 kWh, outside 3.4 °C2025-12-31: 49.7 kWh, outside 2.2 °C2026-01-01: 0.4 kWh, outside 4.7 °Cdaily COP (heat ÷ electricity)1352025-12-05: COP 3.582025-12-06: COP 4.162025-12-07: COP 4.082025-12-08: COP 3.812025-12-09: COP 4.682025-12-10: COP 4.422025-12-11: COP 3.692025-12-12: COP 3.952025-12-13: COP 3.282025-12-14: COP 4.272025-12-15: COP 4.082025-12-16: COP 3.412025-12-17: COP 3.392025-12-18: COP 4.12025-12-19: COP 3.72025-12-20: COP 3.172025-12-21: COP 42025-12-22: COP 3.72025-12-23: COP 3.632025-12-24: COP 3.52025-12-25: COP 4.842025-12-26: COP 2.722025-12-27: COP 3.022025-12-28: COP 3.212025-12-29: COP 3.052025-12-30: COP 2.792025-12-31: COP 2.6812-0512-0912-1312-1712-2112-2512-29
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060-3-113579111315outdoor 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.