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Home / system #78

Vaillant Arotherm+

Bishops Stortford · Detached · 156 m² · 1940 to 1982 · 5 kW · underfloor · installed by Pro-Flo

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

Last 7 days

169 hourly rows · MID-class heat meter present: yes
4.38efficiency (COP) over 169 hours, from the heat meter
better than 92% of the metered fleet in January 2026
Electricity used
46 kWh
Heat delivered
200 kWh (heat meter)
Estimate without heat meter
flow sensor 4.51 · temperature model 4.66
Mean outdoor temperature
10.1 °C · 68 space-heating hours · cooling 0 kWh removed (0 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
33.4 °C (curve slope -0.06 per K)
Flow − return while heating
4.2 K
House needs at −3 °C
7.9 kW (unit rated 5 kW) · fit r² 0.09
Hot water
no hot-water flag in data
warningUnit is rated 5 kW but the house needs about 7.9 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 day0492026-10-31: 4.8 kWh, outside 12.2 °C2026-11-01: 6.8 kWh, outside 10.2 °C2026-11-02: 6.8 kWh, outside 10.3 °C2026-11-03: 8.5 kWh, outside 10.2 °C2026-11-04: 8 kWh, outside 10 °C2026-11-05: 8.1 kWh, outside 9.9 °C2026-11-06: 2.6 kWh, outside 10 °C2026-11-07: 0.1 kWh, outside 5.4 °Cdaily COP (heat ÷ electricity)1352026-10-31: COP 4.332026-11-01: COP 4.242026-11-02: COP 4.432026-11-03: COP 4.522026-11-04: COP 4.362026-11-05: COP 4.472026-11-06: COP 4.2310-3111-0111-0211-0311-0411-0511-0611-07
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
20304050607891011121314outdoor 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.