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Home / system #169

Vaillant Arotherm Split

Swanage, Dorset · Mid-terrace · 70 m² · Pre-1900 · 7 kW · radiators · installed by Inafix

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

Last 30 days

721 hourly rows · MID-class heat meter present: yes
4.11efficiency (COP) over 721 hours, from the heat meter
better than 84% of the metered fleet in January 2026
Electricity used
55 kWh
Heat delivered
226 kWh (heat meter)
Estimate without heat meter
flow sensor 3.18 · temperature model 9.93
Mean outdoor temperature
12.6 °C · 33 space-heating hours · cooling 0 kWh removed (0 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
34.6 °C (curve slope -0.37 per K)
Flow − return while heating
1.6 K
House needs at −3 °C
2.2 kW (unit rated 7 kW) · fit r² 0.03
Hot water
11% of electricity, COP 0.44
infoOnly 33 space-heating hours in this window
Space-heating findings need at least 60 hours with the compressor running below 15 °C outside. Choose a winter window or come back during the heating season.
noteOwner’s note on the source site: “No heat on hot water due to split system”

Day by day

electricity per daydaily COP3.0 floor
electricity, kWh per day0252026-10-08: 0 kWh, outside 14.2 °C2026-10-09: 0 kWh, outside 15.9 °C2026-10-10: 0 kWh, outside 12.9 °C2026-10-11: 0 kWh, outside 14.5 °C2026-10-12: 0 kWh, outside 16.5 °C2026-10-13: 4 kWh, outside 16.7 °C2026-10-14: 3.9 kWh, outside 15.2 °C2026-10-15: 2.8 kWh, outside 18 °C2026-10-16: 4.7 kWh, outside 14.3 °C2026-10-17: 2.8 kWh, outside 10.9 °C2026-10-18: 1.3 kWh, outside 10.6 °C2026-10-19: 1.2 kWh, outside 12.2 °C2026-10-20: 1.6 kWh, outside 10.8 °C2026-10-21: 1.7 kWh, outside 11.6 °C2026-10-22: 1.4 kWh, outside 12.7 °C2026-10-23: 1.7 kWh, outside 11 °C2026-10-24: 1.4 kWh, outside 12.1 °C2026-10-25: 1.8 kWh, outside 11.3 °C2026-10-26: 0.8 kWh, outside 14.2 °C2026-10-27: 0.9 kWh, outside 13.3 °C2026-10-28: 1.3 kWh, outside 12.4 °C2026-10-29: 1.1 kWh, outside 13.1 °C2026-10-30: 1.1 kWh, outside 13.8 °C2026-10-31: 1.4 kWh, outside 11.8 °C2026-11-01: 2.1 kWh, outside 8.6 °C2026-11-02: 2 kWh, outside 10.5 °C2026-11-03: 2.1 kWh, outside 9.8 °C2026-11-04: 2.5 kWh, outside 9.8 °C2026-11-05: 2.4 kWh, outside 9.6 °C2026-11-06: 4 kWh, outside 10.6 °C2026-11-07: 3.2 kWh, outside 9.1 °Cdaily COP (heat ÷ electricity)1352026-10-13: COP 2.752026-10-14: COP 3.082026-10-15: COP 2.492026-10-16: COP 3.092026-10-17: COP 3.732026-10-18: COP 3.872026-10-19: COP 4.122026-10-20: COP 4.312026-10-21: COP 4.492026-10-22: COP 5.162026-10-23: COP 4.442026-10-24: COP 4.832026-10-25: COP 4.512026-10-26: COP 4.782026-10-27: COP 4.882026-10-28: COP 4.72026-10-29: COP 4.732026-10-30: COP 4.742026-10-31: COP 4.512026-11-01: COP 4.462026-11-02: COP 4.652026-11-03: COP 4.622026-11-04: COP 4.82026-11-05: COP 4.92026-11-06: COP 4.792026-11-07: COP 4.6510-0810-1210-1610-2010-2410-2811-0111-05
Daily COP needs a heat meter; days without one show electricity only.
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.