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Home / system #61

Nibe F2040

Sleaford, Lincolnshire · Detached · 214 m² · 1940 to 1982 · 12 kW · underfloor

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
3.56efficiency (COP) over 745 hours, from the heat meter
better than 41% of the metered fleet in January 2026
Electricity used
845 kWh
Heat delivered
3010 kWh (heat meter)
Estimate without heat meter
flow sensor 3.64 · temperature model 3.99
Mean outdoor temperature
7.1 °C · 516 space-heating hours · cooling 0 kWh removed (2 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
36.6 °C (curve slope -0.71 per K)
Flow − return while heating
3.5 K
House needs at −3 °C
7.9 kW (unit rated 12 kW) · fit r² 0.18
Hot water
14% of electricity, COP 3.75
infoNo configuration faults detected in this window
Keep the current settings. We will alert you if efficiency drifts.
valueReaching the fleet’s January median (3.69) would have saved about £7 in this window at 0.25 GBP/kWh. An estimate, not a promise.

Day by day

electricity per daydaily COP3.0 floor
electricity, kWh per day026522025-12-01: 17.5 kWh, outside 10.3 °C2025-12-02: 28.5 kWh, outside 7.4 °C2025-12-03: 34.4 kWh, outside 4.9 °C2025-12-04: 33.9 kWh, outside 6.3 °C2025-12-05: 35.6 kWh, outside 4.8 °C2025-12-06: 18 kWh, outside 9.7 °C2025-12-07: 18.6 kWh, outside 9.3 °C2025-12-08: 19.3 kWh, outside 10.4 °C2025-12-09: 12.8 kWh, outside 12.4 °C2025-12-10: 18.3 kWh, outside 10 °C2025-12-11: 20.7 kWh, outside 9 °C2025-12-12: 21.4 kWh, outside 8.5 °C2025-12-13: 31.3 kWh, outside 5.9 °C2025-12-14: 18.2 kWh, outside 9.5 °C2025-12-15: 15.4 kWh, outside 10.3 °C2025-12-16: 15 kWh, outside 6.5 °C2025-12-17: 23.5 kWh, outside 5.9 °C2025-12-18: 18.6 kWh, outside 9.9 °C2025-12-19: 26.6 kWh, outside 7.2 °C2025-12-20: 36.7 kWh, outside 4.9 °C2025-12-21: 27 kWh, outside 7.7 °C2025-12-22: 22.7 kWh, outside 8.1 °C2025-12-23: 29.7 kWh, outside 6.3 °C2025-12-24: 28.9 kWh, outside 4.7 °C2025-12-25: 36.3 kWh, outside 4 °C2025-12-26: 44.5 kWh, outside 3.5 °C2025-12-27: 37.9 kWh, outside 4.8 °C2025-12-28: 25.7 kWh, outside 5.7 °C2025-12-29: 28.9 kWh, outside 5.4 °C2025-12-30: 45.5 kWh, outside 3.9 °C2025-12-31: 52.2 kWh, outside 2 °C2026-01-01: 2.9 kWh, outside 3.4 °Cdaily COP (heat ÷ electricity)1352025-12-01: COP 4.142025-12-02: COP 3.792025-12-03: COP 3.42025-12-04: COP 3.532025-12-05: COP 3.072025-12-06: COP 3.922025-12-07: COP 3.842025-12-08: COP 4.162025-12-09: COP 4.442025-12-10: COP 4.072025-12-11: COP 4.082025-12-12: COP 4.142025-12-13: COP 3.292025-12-14: COP 4.182025-12-15: COP 4.242025-12-16: COP 3.792025-12-17: COP 2.922025-12-18: COP 4.322025-12-19: COP 3.722025-12-20: COP 3.112025-12-21: COP 3.812025-12-22: COP 3.952025-12-23: COP 3.942025-12-24: COP 3.752025-12-25: COP 3.542025-12-26: COP 2.952025-12-27: COP 2.982025-12-28: COP 3.592025-12-29: COP 3.932025-12-30: COP 3.192025-12-31: COP 2.772026-01-01: COP 3.0712-0112-0512-0912-1312-1712-2112-2512-29
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.