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Home / system #350

Vaillant Arotherm+

Rotselaar, Belgium · Semi-detached · 250 m² · 1983 to 2011 · 5 kW · underfloor · installed by Dieter Roels

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

5 Jan – 4 Feb 2026 (winter reference)

721 hourly rows · MID-class heat meter present: yes
4.12efficiency (COP) over 721 hours, from the heat meter
better than 84% of the metered fleet in January 2026
Electricity used
629 kWh
Heat delivered
2589 kWh (heat meter)
Estimate without heat meter
flow sensor 4.02 · temperature model 4.10
Mean outdoor temperature
4.2 °C · 647 space-heating hours
Flow temperature at 0 °C outside
29.1 °C (curve slope -0.17 per K)
Flow − return while heating
3.2 K
House needs at −3 °C
4.4 kW (unit rated 5 kW) · fit r² 0.48
Hot water
13% of electricity, COP 3.58
infoNo configuration faults detected in this window
Keep the current settings. We will alert you if efficiency drifts.
noteOwner’s note on the source site: “Not recording negative heat on heat meter”

Day by day

electricity per daydaily COP3.0 floor
electricity, kWh per day017352026-01-05: 34.9 kWh, outside -1.8 °C2026-01-06: 32.6 kWh, outside -1.5 °C2026-01-07: 32.9 kWh, outside -0.4 °C2026-01-08: 27.6 kWh, outside 1.7 °C2026-01-09: 23 kWh, outside 3.9 °C2026-01-10: 33.9 kWh, outside -1.8 °C2026-01-11: 32.4 kWh, outside -1.2 °C2026-01-12: 23.2 kWh, outside 6.1 °C2026-01-13: 14.8 kWh, outside 8.3 °C2026-01-14: 14.8 kWh, outside 7.7 °C2026-01-15: 12.6 kWh, outside 8.9 °C2026-01-16: 13.6 kWh, outside 8.5 °C2026-01-17: 12.4 kWh, outside 8.1 °C2026-01-18: 15.9 kWh, outside 5.8 °C2026-01-19: 21.5 kWh, outside 4.1 °C2026-01-20: 21.1 kWh, outside 4.2 °C2026-01-21: 13.6 kWh, outside 6.6 °C2026-01-22: 16.1 kWh, outside 5.9 °C2026-01-23: 14.1 kWh, outside 6.3 °C2026-01-24: 15.7 kWh, outside 4.9 °C2026-01-25: 21.6 kWh, outside 2.6 °C2026-01-26: 28.2 kWh, outside 0.3 °C2026-01-27: 20.6 kWh, outside 4.1 °C2026-01-28: 20.5 kWh, outside 4.2 °C2026-01-29: 25.6 kWh, outside 1.8 °C2026-01-30: 22.3 kWh, outside 4.2 °C2026-01-31: 13.7 kWh, outside 6.7 °C2026-02-01: 15.3 kWh, outside 5.8 °C2026-02-02: 14.5 kWh, outside 6 °C2026-02-03: 19.4 kWh, outside 5.1 °C2026-02-04: 0.5 kWh, outside 5.8 °Cdaily COP (heat ÷ electricity)1352026-01-05: COP 3.172026-01-06: COP 3.262026-01-07: COP 3.342026-01-08: COP 3.792026-01-09: COP 4.272026-01-10: COP 3.22026-01-11: COP 3.342026-01-12: COP 4.542026-01-13: COP 5.462026-01-14: COP 5.362026-01-15: COP 5.472026-01-16: COP 5.252026-01-17: COP 5.142026-01-18: COP 4.612026-01-19: COP 3.992026-01-20: COP 42026-01-21: COP 4.742026-01-22: COP 4.592026-01-23: COP 4.972026-01-24: COP 4.632026-01-25: COP 3.832026-01-26: COP 3.432026-01-27: COP 4.342026-01-28: COP 4.372026-01-29: COP 3.812026-01-30: COP 4.052026-01-31: COP 5.052026-02-01: COP 4.782026-02-02: COP 4.962026-02-03: COP 4.42026-02-04: COP 5.5901-0501-0901-1301-1701-2101-2501-2902-02
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060-5-3-11357911outdoor 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.