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Home / system #723

Samsung Gen 7

Wymondham, Norfolk · Detached · 375 m² · Pre-1900 · 16 kW · radiators · installed by Simon Bennett (Self Install)

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

Last 30 days

719 hourly rows · MID-class heat meter present: yes
5.16efficiency (COP) over 719 hours, from the heat meter
better than 99% of the metered fleet in January 2026
Electricity used
523 kWh
Heat delivered
2697 kWh (heat meter)
Estimate without heat meter
flow sensor 5.12 · temperature model 4.96
Mean outdoor temperature
10.8 °C · 416 space-heating hours · cooling 1 kWh removed (2 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
34.6 °C (curve slope -0.39 per K)
Flow − return while heating
3.9 K
House needs at −3 °C
6.6 kW (unit rated 16 kW) · fit r² 0.03
Hot water
20% of electricity, COP 4.14
infoUnit is rated 16 kW but the house needs about 6.6 kW at −3 °C
Oversizing causes cycling in mild weather. Cannot be fixed cheaply now, but the curve and minimum run time can limit the damage.

Day by day

electricity per daydaily COP3.0 floor
electricity, kWh per day013262026-10-08: 8.4 kWh, outside 10.7 °C2026-10-09: 12.1 kWh, outside 13.7 °C2026-10-10: 18 kWh, outside 10.5 °C2026-10-11: 22.3 kWh, outside 9.3 °C2026-10-12: 16 kWh, outside 13.5 °C2026-10-13: 10.3 kWh, outside 15.8 °C2026-10-14: 13.7 kWh, outside 12.7 °C2026-10-15: 9 kWh, outside 15.9 °C2026-10-16: 14.2 kWh, outside 11.6 °C2026-10-17: 17.6 kWh, outside 10 °C2026-10-18: 20.8 kWh, outside 10.2 °C2026-10-19: 16.5 kWh, outside 12.1 °C2026-10-20: 17.6 kWh, outside 11.9 °C2026-10-21: 23.8 kWh, outside 9.5 °C2026-10-22: 24.8 kWh, outside 9 °C2026-10-23: 20.7 kWh, outside 10.5 °C2026-10-24: 24.6 kWh, outside 9.1 °C2026-10-25: 25.4 kWh, outside 10.1 °C2026-10-26: 24.6 kWh, outside 10.6 °C2026-10-27: 15.7 kWh, outside 12.6 °C2026-10-28: 26.3 kWh, outside 10.2 °C2026-10-29: 17.3 kWh, outside 10.5 °C2026-10-30: 23.9 kWh, outside 9.4 °C2026-10-31: 15.6 kWh, outside 8 °C2026-11-01: 2.4 kWh, outside 8.8 °C2026-11-02: 4.6 kWh, outside 9.6 °C2026-11-03: 10.6 kWh, outside 9.8 °C2026-11-04: 11.5 kWh, outside 9.9 °C2026-11-05: 13.9 kWh, outside 9.3 °C2026-11-06: 25.2 kWh, outside 9.4 °C2026-11-07: 17.8 kWh, outside 6.9 °Cdaily COP (heat ÷ electricity)1352026-10-08: COP 4.732026-10-09: COP 5.322026-10-10: COP 5.122026-10-11: COP 4.772026-10-12: COP 5.392026-10-13: COP 4.992026-10-14: COP 4.592026-10-15: COP 5.442026-10-16: COP 4.782026-10-17: COP 4.942026-10-18: COP 5.352026-10-19: COP 5.742026-10-20: COP 5.482026-10-21: COP 5.12026-10-22: COP 5.12026-10-23: COP 5.242026-10-24: COP 5.112026-10-25: COP 5.172026-10-26: COP 5.262026-10-27: COP 5.632026-10-28: COP 5.112026-10-29: COP 5.452026-10-30: COP 4.822026-10-31: COP 4.062026-11-01: COP 1.412026-11-02: COP 4.232026-11-03: COP 5.662026-11-04: COP 5.882026-11-05: COP 5.562026-11-06: COP 5.542026-11-07: COP 4.5610-0810-1210-1610-2010-2410-2811-0111-05
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060246810121416outdoor 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.