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Home / system #787

Vailllant Arotherm+

Northampton · Detached · 200 m² · 1940 to 1982 · 7 kW · radiators · installed by Custom Renewables

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

Last 30 days

266 hourly rows · MID-class heat meter present: yes
4.49efficiency (COP) over 266 hours, from the heat meter
better than 93% of the metered fleet in January 2026
Electricity used
90 kWh
Heat delivered
406 kWh (heat meter)
Estimate without heat meter
flow sensor 0.00 · temperature model –
Mean outdoor temperature
– °C · 157 space-heating hours
Flow temperature at 0 °C outside
–
Flow − return while heating
1.9 K
House needs at −3 °C
–
Hot water
no hot-water flag in data
warningOnly 1.9 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 day07142026-10-08: 6.7 kWh, outside – °C2026-10-09: 5.5 kWh, outside – °C2026-10-10: 9.3 kWh, outside – °C2026-10-11: 10.2 kWh, outside – °C2026-10-12: 5.1 kWh, outside – °C2026-10-13: 4.2 kWh, outside – °C2026-10-14: 6.9 kWh, outside – °C2026-10-15: 2.8 kWh, outside – °C2026-10-16: 8.7 kWh, outside – °C2026-10-17: 13.3 kWh, outside – °C2026-10-18: 13.6 kWh, outside – °C2026-10-19: 3.9 kWh, outside – °Cdaily COP (heat ÷ electricity)1352026-10-08: COP 4.562026-10-09: COP 3.692026-10-10: COP 4.72026-10-11: COP 4.662026-10-12: COP 4.712026-10-13: COP 3.642026-10-14: COP 4.632026-10-15: COP 4.072026-10-16: COP 4.832026-10-17: COP 4.592026-10-18: COP 4.442026-10-19: COP 4.3510-0810-1010-1210-1410-1610-18
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °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.