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Home / system #267

Stiebel Eltron WPE-I 12 HK Premium

Shetland · Detached · 319 m² · 2012 or newer · 12 kW · underfloor · installed by A J Pottinger

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
4.05efficiency (COP) over 745 hours, from the heat meter
better than 80% of the metered fleet in January 2026
Electricity used
703 kWh
Heat delivered
2849 kWh (heat meter)
Estimate without heat meter
flow sensor 2.54 · temperature model 3.79
Mean outdoor temperature
7.6 °C · 478 space-heating hours
Flow temperature at 0 °C outside
43.8 °C (curve slope -0.58 per K)
Flow − return while heating
5.5 K
House needs at −3 °C
5.8 kW (unit rated 12 kW) · fit r² 0.11
Hot water
53% of electricity, COP 3.41
warningHot water uses 53% of electricity at COP 3.41
Lower the tank target to 45–48 °C, heat water once a day in the warmest hours, and disable weekly legionella cycles unless required.
infoUnit is rated 12 kW but the house needs about 5.8 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.
noteOwner’s note on the source site: “0W standby power review required”

Day by day

electricity per daydaily COP3.0 floor
electricity, kWh per day015302025-12-01: 20.9 kWh, outside 6.5 °C2025-12-02: 20.7 kWh, outside 7 °C2025-12-03: 21.8 kWh, outside 7.6 °C2025-12-04: 22.2 kWh, outside 8.4 °C2025-12-05: 24.2 kWh, outside 8.4 °C2025-12-06: 22.5 kWh, outside 8.1 °C2025-12-07: 22.4 kWh, outside 8.4 °C2025-12-08: 21 kWh, outside 7.7 °C2025-12-09: 19.2 kWh, outside 8.5 °C2025-12-10: 17.8 kWh, outside 9.8 °C2025-12-11: 17.4 kWh, outside 10.2 °C2025-12-12: 21 kWh, outside 8.2 °C2025-12-13: 22 kWh, outside 8.6 °C2025-12-14: 18.1 kWh, outside 10.3 °C2025-12-15: 19.2 kWh, outside 7.4 °C2025-12-16: 21.8 kWh, outside 7.3 °C2025-12-17: 21.7 kWh, outside 8.2 °C2025-12-18: 19.8 kWh, outside 8.1 °C2025-12-19: 21.2 kWh, outside 7.4 °C2025-12-20: 24.3 kWh, outside 7.8 °C2025-12-21: 24.6 kWh, outside 8.5 °C2025-12-22: 22.7 kWh, outside 8.5 °C2025-12-23: 21.9 kWh, outside 8.5 °C2025-12-24: 20.8 kWh, outside 7.8 °C2025-12-25: 26.8 kWh, outside 7.7 °C2025-12-26: 28.1 kWh, outside 7.2 °C2025-12-27: 29.5 kWh, outside 4.2 °C2025-12-28: 23.3 kWh, outside 5.2 °C2025-12-29: 30 kWh, outside 3.6 °C2025-12-30: 29.9 kWh, outside 4.6 °C2025-12-31: 25.6 kWh, outside 6.2 °C2026-01-01: 1.1 kWh, outside 2.9 °Cdaily COP (heat ÷ electricity)1352025-12-01: COP 4.152025-12-02: COP 4.12025-12-03: COP 4.162025-12-04: COP 4.152025-12-05: COP 4.112025-12-06: COP 4.172025-12-07: COP 4.042025-12-08: COP 4.192025-12-09: COP 4.052025-12-10: COP 4.272025-12-11: COP 4.072025-12-12: COP 4.172025-12-13: COP 4.132025-12-14: COP 3.992025-12-15: COP 4.092025-12-16: COP 4.052025-12-17: COP 4.182025-12-18: COP 4.052025-12-19: COP 4.042025-12-20: COP 4.182025-12-21: COP 3.992025-12-22: COP 42025-12-23: COP 3.992025-12-24: COP 4.092025-12-25: COP 4.12025-12-26: COP 4.032025-12-27: COP 3.962025-12-28: COP 3.812025-12-29: COP 3.862025-12-30: COP 3.752025-12-31: COP 3.92026-01-01: COP 4.3512-0112-0512-0912-1312-1712-2112-2512-29
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060-1135791113outdoor 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.