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Home / system #448

Nibe S2125

Bristol · Detached · 210 m² · 2012 or newer · 12 kW · underfloor · installed by C Brookes Plumbing & Heating Ltd

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
4.57efficiency (COP) over 745 hours, from the heat meter
better than 94% of the metered fleet in January 2026
Electricity used
358 kWh
Heat delivered
1637 kWh (heat meter)
Estimate without heat meter
flow sensor 4.67 · temperature model 4.93
Mean outdoor temperature
7.7 °C · 564 space-heating hours
Flow temperature at 0 °C outside
28.8 °C (curve slope -0.17 per K)
Flow − return while heating
1.6 K
House needs at −3 °C
3.8 kW (unit rated 12 kW) · fit r² 0.08
Hot water
no hot-water flag in data
warningOnly 1.6 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.
infoUnit is rated 12 kW but the house needs about 3.8 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 day015292025-12-01: 6.3 kWh, outside 11.1 °C2025-12-02: 12 kWh, outside 7.3 °C2025-12-03: 15.3 kWh, outside 4.8 °C2025-12-04: 11.6 kWh, outside 6.2 °C2025-12-05: 13.1 kWh, outside 6.2 °C2025-12-06: 6.9 kWh, outside 10.6 °C2025-12-07: 7.5 kWh, outside 11.4 °C2025-12-08: 5.5 kWh, outside 12 °C2025-12-09: 4.3 kWh, outside 13 °C2025-12-10: 9 kWh, outside 10.7 °C2025-12-11: 7.6 kWh, outside 10 °C2025-12-12: 9.4 kWh, outside 9.2 °C2025-12-13: 13.5 kWh, outside 5.5 °C2025-12-14: 7.6 kWh, outside 10.2 °C2025-12-15: 5.6 kWh, outside 10.6 °C2025-12-16: 9.6 kWh, outside 6.9 °C2025-12-17: 13 kWh, outside 7 °C2025-12-18: 7.2 kWh, outside 9.9 °C2025-12-19: 10.7 kWh, outside 8.2 °C2025-12-20: 13.2 kWh, outside 6.8 °C2025-12-21: 8.5 kWh, outside 9.1 °C2025-12-22: 7 kWh, outside 10.1 °C2025-12-23: 9.9 kWh, outside 7.7 °C2025-12-24: 16.1 kWh, outside 5 °C2025-12-25: 17.5 kWh, outside 3.8 °C2025-12-26: 19 kWh, outside 4.1 °C2025-12-27: 16 kWh, outside 5.4 °C2025-12-28: 15.1 kWh, outside 6.1 °C2025-12-29: 14.1 kWh, outside 5.2 °C2025-12-30: 15.9 kWh, outside 5.1 °C2025-12-31: 29.4 kWh, outside 0.7 °C2026-01-01: 0.6 kWh, outside 1.9 °Cdaily COP (heat ÷ electricity)1352025-12-01: COP 5.482025-12-02: COP 4.682025-12-03: COP 4.442025-12-04: COP 4.892025-12-05: COP 4.352025-12-06: COP 5.452025-12-07: COP 5.142025-12-08: COP 5.662025-12-09: COP 5.542025-12-10: COP 5.092025-12-11: COP 5.182025-12-12: COP 4.992025-12-13: COP 4.552025-12-14: COP 5.052025-12-15: COP 5.562025-12-16: COP 5.112025-12-17: COP 4.32025-12-18: COP 5.582025-12-19: COP 5.022025-12-20: COP 4.552025-12-21: COP 5.282025-12-22: COP 5.422025-12-23: COP 52025-12-24: COP 4.282025-12-25: COP 4.442025-12-26: COP 4.072025-12-27: COP 4.022025-12-28: COP 4.372025-12-29: COP 4.662025-12-30: COP 4.162025-12-31: COP 3.092026-01-01: COP 4.6112-0112-0512-0912-1312-1712-2112-2512-29
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060-5-2147101316outdoor 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.