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Home / system #568

Vaillant Arotherm+

Co Antrim - Northern Ireland · Detached · 356 m² · 2012 or newer · 10 kW · underfloor · installed by Newell Contracts

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
4.82efficiency (COP) over 721 hours, from the heat meter
better than 98% of the metered fleet in January 2026
Electricity used
750 kWh
Heat delivered
3616 kWh (heat meter)
Estimate without heat meter
flow sensor 4.71 · temperature model 4.65
Mean outdoor temperature
5.5 °C · 607 space-heating hours · cooling 1 kWh removed (1 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
27.9 °C (curve slope -0.24 per K)
Flow − return while heating
2.2 K
House needs at −3 °C
5.6 kW (unit rated 10 kW) · fit r² 0.00
Hot water
15% of electricity, COP 4.07
warningOnly 2.2 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 day023462026-01-05: 46 kWh, outside 0.4 °C2026-01-06: 32.1 kWh, outside 3 °C2026-01-07: 30.3 kWh, outside 3.6 °C2026-01-08: 34 kWh, outside 3 °C2026-01-09: 35.3 kWh, outside 2.8 °C2026-01-10: 40.3 kWh, outside 1.8 °C2026-01-11: 12.1 kWh, outside 9 °C2026-01-12: 16.4 kWh, outside 8.4 °C2026-01-13: 27 kWh, outside 4.9 °C2026-01-14: 25 kWh, outside 4.5 °C2026-01-15: 26.9 kWh, outside 4.5 °C2026-01-16: 21.2 kWh, outside 5.2 °C2026-01-17: 18.8 kWh, outside 5.8 °C2026-01-18: 14.1 kWh, outside 6.3 °C2026-01-19: 14.6 kWh, outside 6.7 °C2026-01-20: 17.1 kWh, outside 6.5 °C2026-01-21: 16.5 kWh, outside 7 °C2026-01-22: 19.4 kWh, outside 8.2 °C2026-01-23: 18.1 kWh, outside 6.9 °C2026-01-24: 18.3 kWh, outside 7.3 °C2026-01-25: 17.9 kWh, outside 7 °C2026-01-26: 23.6 kWh, outside 5.5 °C2026-01-27: 30.4 kWh, outside 6.1 °C2026-01-28: 26.3 kWh, outside 6.5 °C2026-01-29: 28.6 kWh, outside 6.2 °C2026-01-30: 32 kWh, outside 5.2 °C2026-01-31: 22.9 kWh, outside 6.3 °C2026-02-01: 26.5 kWh, outside 5.5 °C2026-02-02: 24.5 kWh, outside 6.2 °C2026-02-03: 33.2 kWh, outside 4.9 °C2026-02-04: 1.5 kWh, outside 3.3 °Cdaily COP (heat ÷ electricity)1352026-01-05: COP 3.292026-01-06: COP 4.022026-01-07: COP 4.272026-01-08: COP 3.882026-01-09: COP 3.782026-01-10: COP 3.362026-01-11: COP 5.982026-01-12: COP 5.972026-01-13: COP 4.662026-01-14: COP 4.532026-01-15: COP 4.672026-01-16: COP 4.92026-01-17: COP 5.462026-01-18: COP 5.72026-01-19: COP 5.822026-01-20: COP 5.762026-01-21: COP 5.652026-01-22: COP 5.872026-01-23: COP 5.792026-01-24: COP 5.642026-01-25: COP 5.842026-01-26: COP 5.522026-01-27: COP 52026-01-28: COP 5.42026-01-29: COP 5.232026-01-30: COP 4.892026-01-31: COP 5.522026-02-01: COP 5.222026-02-02: COP 5.242026-02-03: COP 4.482026-02-04: COP 4.4901-0501-0901-1301-1701-2101-2501-2902-02
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

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