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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

Last 30 days

354 hourly rows · MID-class heat meter present: yes
4.75efficiency (COP) over 354 hours, from the heat meter
better than 97% of the metered fleet in January 2026
Electricity used
146 kWh
Heat delivered
693 kWh (heat meter)
Estimate without heat meter
flow sensor 4.77 · temperature model 4.62
Mean outdoor temperature
10.1 °C · 160 space-heating hours · cooling 0 kWh removed (0 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
37.3 °C (curve slope -0.61 per K)
Flow − return while heating
3.2 K
House needs at −3 °C
7.5 kW (unit rated 5 kW) · fit r² 0.42
Hot water
25% of electricity, COP 3.76
warningUnit is rated 5 kW but the house needs about 7.5 kW at −3 °C
Expect backup heater use on the coldest days. Improve insulation or draught-proofing before adding capacity.

Day by day

electricity per daydaily COP3.0 floor
electricity, kWh per day07152026-10-23: 4.6 kWh, outside 8.3 °C2026-10-24: 11.8 kWh, outside 10.9 °C2026-10-25: 10.7 kWh, outside 11.4 °C2026-10-26: 8.8 kWh, outside 13 °C2026-10-27: 5.9 kWh, outside 13.7 °C2026-10-28: 8 kWh, outside 10.8 °C2026-10-29: 5.8 kWh, outside 11.8 °C2026-10-30: 7.7 kWh, outside 10.4 °C2026-10-31: 7.8 kWh, outside 10.1 °C2026-11-01: 9.9 kWh, outside 8.5 °C2026-11-02: 10.6 kWh, outside 9.3 °C2026-11-03: 12.5 kWh, outside 9.4 °C2026-11-04: 14.5 kWh, outside 8.1 °C2026-11-05: 12.8 kWh, outside 8.3 °C2026-11-06: 10.8 kWh, outside 8.6 °C2026-11-07: 3.8 kWh, outside 5.1 °Cdaily COP (heat ÷ electricity)1352026-10-23: COP 4.542026-10-24: COP 4.922026-10-25: COP 4.832026-10-26: COP 5.482026-10-27: COP 4.942026-10-28: COP 4.662026-10-29: COP 5.012026-10-30: COP 5.122026-10-31: COP 5.072026-11-01: COP 4.872026-11-02: COP 4.662026-11-03: COP 4.652026-11-04: COP 3.992026-11-05: COP 4.382026-11-06: COP 4.772026-11-07: COP 4.8810-2310-2510-2710-2910-3111-0211-0411-06
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.