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Home / system #307

Viessmann Vitocal 151A

Great Haseley, Oxfordshire · Detached · 212 m² · 2012 or newer · 10 kW · underfloor · installed by Harveys & JMR

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

5 Jan – 4 Feb 2026 (winter reference)

355 hourly rows · MID-class heat meter present: yes
4.06efficiency (COP) over 355 hours, from the heat meter
better than 81% of the metered fleet in January 2026
Electricity used
459 kWh
Heat delivered
1866 kWh (heat meter)
Estimate without heat meter
flow sensor 4.14 · temperature model 3.43
Mean outdoor temperature
4.1 °C · 354 space-heating hours
Flow temperature at 0 °C outside
36.8 °C (curve slope -0.50 per K)
Flow − return while heating
3.0 K
House needs at −3 °C
6.4 kW (unit rated 10 kW) · fit r² 0.50
Hot water
no hot-water flag in data
infoNo configuration faults detected in this window
Keep the current settings. We will alert you if efficiency drifts.

Day by day

electricity per daydaily COP3.0 floor
electricity, kWh per day025512026-01-05: 50.6 kWh, outside -3 °C2026-01-06: 47.5 kWh, outside -1.6 °C2026-01-07: 37.3 kWh, outside 3.4 °C2026-01-08: 33.3 kWh, outside 3.6 °C2026-01-09: 34.3 kWh, outside 3.3 °C2026-01-10: 45 kWh, outside -0.9 °C2026-01-11: 29 kWh, outside 4.8 °C2026-01-12: 18.4 kWh, outside 10.1 °C2026-01-13: 19.3 kWh, outside 8.6 °C2026-01-14: 34 kWh, outside 2.5 °C2026-01-15: 21.7 kWh, outside 7.7 °C2026-01-16: 15 kWh, outside 4.1 °C2026-01-31: 3.7 kWh, outside 7.2 °C2026-02-01: 19.8 kWh, outside 7.4 °C2026-02-02: 20.6 kWh, outside 6.8 °C2026-02-03: 28.1 kWh, outside 4.3 °C2026-02-04: 1.5 kWh, outside 2.7 °Cdaily COP (heat ÷ electricity)1352026-01-05: COP 3.292026-01-06: COP 3.212026-01-07: COP 3.972026-01-08: COP 4.072026-01-09: COP 3.992026-01-10: COP 3.392026-01-11: COP 4.262026-01-12: COP 5.42026-01-13: COP 5.252026-01-14: COP 3.762026-01-15: COP 4.962026-01-16: COP 4.442026-01-31: COP 5.52026-02-01: COP 4.812026-02-02: COP 5.012026-02-03: COP 4.442026-02-04: COP 2.7701-0501-0701-0901-1101-1301-1501-3102-0202-04
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060-11-8-5-21471013outdoor 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.