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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

1–31 Dec 2025

745 hourly rows · MID-class heat meter present: yes
5.14efficiency (COP) over 745 hours, from the heat meter
better than 99% of the metered fleet in January 2026
Electricity used
645 kWh
Heat delivered
3312 kWh (heat meter)
Estimate without heat meter
flow sensor 4.95 · temperature model 4.98
Mean outdoor temperature
7.1 °C · 574 space-heating hours · cooling 1 kWh removed (2 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
28.0 °C (curve slope -0.27 per K)
Flow − return while heating
2.1 K
House needs at −3 °C
5.9 kW (unit rated 10 kW) · fit r² 0.03
Hot water
19% of electricity, COP 4.09
warningOnly 2.1 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 day022442025-12-01: 16.2 kWh, outside 8.2 °C2025-12-02: 23.7 kWh, outside 5.5 °C2025-12-03: 21.8 kWh, outside 5.4 °C2025-12-04: 26.2 kWh, outside 5.3 °C2025-12-05: 16.5 kWh, outside 6.7 °C2025-12-06: 14.7 kWh, outside 8.6 °C2025-12-07: 15.8 kWh, outside 8.3 °C2025-12-08: 15 kWh, outside 8.7 °C2025-12-09: 9.8 kWh, outside 11.5 °C2025-12-10: 17 kWh, outside 9.4 °C2025-12-11: 15.3 kWh, outside 9.4 °C2025-12-12: 22.9 kWh, outside 6.1 °C2025-12-13: 16.3 kWh, outside 8.2 °C2025-12-14: 10.7 kWh, outside 11.9 °C2025-12-15: 19.7 kWh, outside 6 °C2025-12-16: 30.7 kWh, outside 3.6 °C2025-12-17: 15.9 kWh, outside 9 °C2025-12-18: 17.4 kWh, outside 7.1 °C2025-12-19: 21.1 kWh, outside 7.2 °C2025-12-20: 17.2 kWh, outside 8 °C2025-12-21: 14.9 kWh, outside 8.6 °C2025-12-22: 15.8 kWh, outside 9.2 °C2025-12-23: 16.2 kWh, outside 8.5 °C2025-12-24: 22.6 kWh, outside 6.5 °C2025-12-25: 27.3 kWh, outside 5.3 °C2025-12-26: 28.5 kWh, outside 5.1 °C2025-12-27: 28.7 kWh, outside 4.9 °C2025-12-28: 30.7 kWh, outside 6.3 °C2025-12-29: 24 kWh, outside 4.9 °C2025-12-30: 29 kWh, outside 4.4 °C2025-12-31: 43.7 kWh, outside 1.4 °C2026-01-01: 1.1 kWh, outside 3.3 °Cdaily COP (heat ÷ electricity)1352025-12-01: COP 5.782025-12-02: COP 4.982025-12-03: COP 5.092025-12-04: COP 4.752025-12-05: COP 5.032025-12-06: COP 6.052025-12-07: COP 6.092025-12-08: COP 5.852025-12-09: COP 6.392025-12-10: COP 5.752025-12-11: COP 5.992025-12-12: COP 5.112025-12-13: COP 5.462025-12-14: COP 6.22025-12-15: COP 5.72025-12-16: COP 4.212025-12-17: COP 5.152025-12-18: COP 4.962025-12-19: COP 5.562025-12-20: COP 5.872025-12-21: COP 6.482025-12-22: COP 5.872025-12-23: COP 6.022025-12-24: COP 5.162025-12-25: COP 4.692025-12-26: COP 4.662025-12-27: COP 4.582025-12-28: COP 4.952025-12-29: COP 4.582025-12-30: COP 4.592025-12-31: COP 3.652026-01-01: COP 5.1212-0112-0512-0912-1312-1712-2112-2512-29
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060-3-113579111315outdoor 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.