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Home / system #812

Vaillant Arotherm+

Hove, East Sussex · Detached · 118 m² · 1940 to 1982 · 5 kW · radiators · installed by Hartswood

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

1–31 Dec 2025

743 hourly rows · MID-class heat meter present: yes
4.08efficiency (COP) over 743 hours, from the heat meter
better than 81% of the metered fleet in January 2026
Electricity used
564 kWh
Heat delivered
2301 kWh (heat meter)
Estimate without heat meter
flow sensor 4.11 · temperature model 3.86
Mean outdoor temperature
7.8 °C · 618 space-heating hours
Flow temperature at 0 °C outside
38.9 °C (curve slope -0.70 per K)
Flow − return while heating
3.1 K
House needs at −3 °C
5.4 kW (unit rated 5 kW) · fit r² 0.69
Hot water
20% of electricity, COP 3.63
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 day020392025-12-01: 13.5 kWh, outside 10.1 °C2025-12-02: 14.2 kWh, outside 8.8 °C2025-12-03: 17.1 kWh, outside 7.3 °C2025-12-04: 17.4 kWh, outside 7.1 °C2025-12-05: 23.9 kWh, outside 4.6 °C2025-12-06: 14.5 kWh, outside 10.7 °C2025-12-07: 11.8 kWh, outside 11.5 °C2025-12-08: 8.9 kWh, outside 12.3 °C2025-12-09: 10.2 kWh, outside 12.4 °C2025-12-10: 10.6 kWh, outside 11 °C2025-12-11: 12.2 kWh, outside 9.8 °C2025-12-12: 11.7 kWh, outside 10.3 °C2025-12-13: 17.1 kWh, outside 6.3 °C2025-12-14: 15.1 kWh, outside 9.2 °C2025-12-15: 11.6 kWh, outside 10.2 °C2025-12-16: 12.4 kWh, outside 10.2 °C2025-12-17: 19.6 kWh, outside 6.2 °C2025-12-18: 11.8 kWh, outside 10.8 °C2025-12-19: 12.9 kWh, outside 8.4 °C2025-12-20: 14.6 kWh, outside 7.3 °C2025-12-21: 12.9 kWh, outside 9.8 °C2025-12-22: 12.1 kWh, outside 9.8 °C2025-12-23: 16.6 kWh, outside 6.4 °C2025-12-24: 26.4 kWh, outside 4.7 °C2025-12-25: 32.9 kWh, outside 3.2 °C2025-12-26: 34.9 kWh, outside 3 °C2025-12-27: 28.7 kWh, outside 5.2 °C2025-12-28: 21 kWh, outside 6.6 °C2025-12-29: 27.9 kWh, outside 4.3 °C2025-12-30: 28.3 kWh, outside 3.9 °C2025-12-31: 39.4 kWh, outside -0.3 °C2026-01-01: 1.9 kWh, outside -2.6 °Cdaily COP (heat ÷ electricity)1352025-12-01: COP 4.82025-12-02: COP 4.742025-12-03: COP 4.472025-12-04: COP 4.262025-12-05: COP 3.852025-12-06: COP 4.982025-12-07: COP 5.132025-12-08: COP 5.172025-12-09: COP 5.152025-12-10: COP 4.422025-12-11: COP 4.922025-12-12: COP 5.022025-12-13: COP 4.32025-12-14: COP 4.752025-12-15: COP 5.172025-12-16: COP 4.712025-12-17: COP 3.92025-12-18: COP 5.192025-12-19: COP 4.742025-12-20: COP 4.672025-12-21: COP 4.962025-12-22: COP 52025-12-23: COP 4.232025-12-24: COP 3.472025-12-25: COP 3.292025-12-26: COP 3.092025-12-27: COP 3.492025-12-28: COP 4.212025-12-29: COP 3.472025-12-30: COP 3.452025-12-31: COP 2.762026-01-01: COP 2.5612-0112-0512-0912-1312-1712-2112-2512-29
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060-4-202468101214outdoor 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.