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Home / system #88

Stiebel Eltron WPL25-AS

Lichfield, UK · Detached · 202 m² · 1940 to 1982 · 12.5 kW · underfloor · installed by Niche Energy Systems Ltd

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

5 Jan – 4 Feb 2026 (winter reference)

368 hourly rows · MID-class heat meter present: no
2.75efficiency (COP) over 368 hours, from the heat meter
better than 3% of the metered fleet in January 2026
Electricity used
841 kWh
Heat delivered
2310 kWh (heat meter)
Estimate without heat meter
flow sensor 2.76 · temperature model 3.60
Mean outdoor temperature
3.6 °C · 356 space-heating hours
Flow temperature at 0 °C outside
37.4 °C (curve slope -0.65 per K)
Flow − return while heating
5.0 K
House needs at −3 °C
8.8 kW (unit rated 12.5 kW) · fit r² 0.11
Hot water
no hot-water flag in data
seriousWinter efficiency 2.75 is below the 3.0 floor used for German subsidies
Ask the installer for a commissioning check; the causes are usually flow temperature, hot water settings, or sizing, all listed below.
valueReaching the fleet’s January median (3.69) would have saved about £54 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 day031622026-01-05: 61.5 kWh, outside -2.4 °C2026-01-06: 61.5 kWh, outside 0.1 °C2026-01-07: 61.5 kWh, outside 2.7 °C2026-01-08: 61.5 kWh, outside 2.4 °C2026-01-09: 61.5 kWh, outside 2.2 °C2026-01-10: 61.5 kWh, outside -0.5 °C2026-01-11: 61.5 kWh, outside 4.3 °C2026-01-12: 61.5 kWh, outside 8 °C2026-01-13: 61.5 kWh, outside 5.8 °C2026-01-14: 61.5 kWh, outside 2.1 °C2026-01-15: 61.5 kWh, outside 4.7 °C2026-01-16: 5.1 kWh, outside 4.5 °C2026-01-30: 7.4 kWh, outside 7.2 °C2026-01-31: 36.3 kWh, outside 6.3 °C2026-02-01: 35.7 kWh, outside 6.8 °C2026-02-02: 31.3 kWh, outside 6.7 °C2026-02-03: 45 kWh, outside 3.6 °C2026-02-04: 2.9 kWh, outside 1.6 °Cdaily COP (heat ÷ electricity)1352026-01-05: COP 3.622026-01-06: COP 3.252026-01-07: COP 2.62026-01-08: COP 2.732026-01-09: COP 2.782026-01-10: COP 3.152026-01-11: COP 2.372026-01-12: COP 1.372026-01-13: COP 1.532026-01-14: COP 1.882026-01-15: COP 1.572026-01-16: COP 3.932026-01-30: COP 4.422026-01-31: COP 3.972026-02-01: COP 3.992026-02-02: COP 4.142026-02-03: COP 3.932026-02-04: COP 3.6501-0501-0701-0901-1101-1301-1501-3002-0102-03
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060-6-4-20246810outdoor 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.