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Home / system #1278

SOLAX STU1-CO8R290

Stafford, Staffordshire · Semi-detached · 68 m² · 1940 to 1982 · 8 kW · underfloor · installed by iHeating Ltd

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

Last 30 days

721 hourly rows · MID-class heat meter present: yes
3.24efficiency (COP) over 721 hours, from the heat meter
better than 24% of the metered fleet in January 2026
Electricity used
224 kWh
Heat delivered
728 kWh (heat meter)
Estimate without heat meter
flow sensor 3.12 · temperature model 5.28
Mean outdoor temperature
10.3 °C · 429 space-heating hours · cooling 3 kWh removed (2 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
27.2 °C (curve slope 0.26 per K)
Flow − return while heating
1.8 K
House needs at −3 °C
1.4 kW (unit rated 8 kW) · fit r² 0.01
Hot water
no hot-water flag in data
warningOnly 1.8 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 8 kW but the house needs about 1.4 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.
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 day07132026-10-08: 2.4 kWh, outside 11.3 °C2026-10-09: 7.2 kWh, outside 14.2 °C2026-10-10: 3.4 kWh, outside 10.8 °C2026-10-11: 8.5 kWh, outside 10.3 °C2026-10-12: 3.1 kWh, outside 14.2 °C2026-10-13: 1.4 kWh, outside 15.2 °C2026-10-14: 4.5 kWh, outside 12.8 °C2026-10-15: 2.2 kWh, outside 15.9 °C2026-10-16: 2.7 kWh, outside 10.1 °C2026-10-17: 8.1 kWh, outside 8 °C2026-10-18: 7.6 kWh, outside 9 °C2026-10-19: 5.2 kWh, outside 10.2 °C2026-10-20: 12.5 kWh, outside 10 °C2026-10-21: 8.8 kWh, outside 7.9 °C2026-10-22: 5.9 kWh, outside 9.3 °C2026-10-23: 7.8 kWh, outside 8.5 °C2026-10-24: 8 kWh, outside 9 °C2026-10-25: 13.2 kWh, outside 9.9 °C2026-10-26: 10.5 kWh, outside 11.1 °C2026-10-27: 8.6 kWh, outside 12.5 °C2026-10-28: 7.6 kWh, outside 10.6 °C2026-10-29: 6.9 kWh, outside 11.5 °C2026-10-30: 8 kWh, outside 10.6 °C2026-10-31: 9.2 kWh, outside 8.9 °C2026-11-01: 9.5 kWh, outside 8.4 °C2026-11-02: 11.5 kWh, outside 7.7 °C2026-11-03: 10.4 kWh, outside 8.2 °C2026-11-04: 8.7 kWh, outside 8.8 °C2026-11-05: 9.4 kWh, outside 8 °C2026-11-06: 9.6 kWh, outside 8.4 °C2026-11-07: 3.6 kWh, outside 5.6 °Cdaily COP (heat ÷ electricity)1352026-10-08: COP 3.612026-10-09: COP 3.962026-10-10: COP 3.252026-10-11: COP 2.172026-10-12: COP 4.422026-10-13: COP 3.382026-10-14: COP 3.92026-10-15: COP 3.872026-10-16: COP 3.352026-10-17: COP 3.292026-10-18: COP 3.762026-10-19: COP 3.882026-10-20: COP 3.842026-10-21: COP 3.482026-10-22: COP 3.512026-10-23: COP 3.42026-10-24: COP 3.42026-10-25: COP 3.412026-10-26: COP 3.922026-10-27: COP 3.732026-10-28: COP 3.932026-10-29: COP 3.882026-10-30: COP 3.92026-10-31: COP 2.352026-11-01: COP 3.392026-11-02: COP 3.482026-11-03: COP 3.522026-11-04: COP 2.642026-11-05: COP 0.652026-11-06: COP 1.092026-11-07: COP 0.0310-0810-1210-1610-2010-2410-2811-0111-05
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
20304050603579111315outdoor 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.