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Home / system #290

Ideal HP290

Ashford, Kent · Semi-detached · 100 m² · 1940 to 1982 · 8 kW · radiators · installed by Jon Hickey (Self Install)

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

5 Jan – 4 Feb 2026 (winter reference)

699 hourly rows · MID-class heat meter present: yes
3.01efficiency (COP) over 699 hours, from the heat meter
better than 8% of the metered fleet in January 2026
Electricity used
548 kWh
Heat delivered
1652 kWh (heat meter)
Estimate without heat meter
flow sensor 2.55 · temperature model 3.32
Mean outdoor temperature
5.4 °C · 462 space-heating hours · cooling 0 kWh removed (0 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
38.0 °C (curve slope -0.29 per K)
Flow − return while heating
2.2 K
House needs at −3 °C
3.6 kW (unit rated 8 kW) · fit r² 0.00
Hot water
no hot-water flag in data
warningOnly 2.2 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 3.6 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 £25 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 day020402026-01-05: 39.2 kWh, outside -1.6 °C2026-01-06: 39.8 kWh, outside -1.5 °C2026-01-07: 26.4 kWh, outside 3 °C2026-01-08: 24.3 kWh, outside 3.6 °C2026-01-09: 24.5 kWh, outside 3.2 °C2026-01-10: 25.2 kWh, outside 0.8 °C2026-01-11: 29.6 kWh, outside 2.6 °C2026-01-12: 13.5 kWh, outside 9.5 °C2026-01-13: 12.3 kWh, outside 8.9 °C2026-01-14: 16.4 kWh, outside 4.6 °C2026-01-15: 13.1 kWh, outside 7.9 °C2026-01-16: 13.4 kWh, outside 6.4 °C2026-01-17: 12.6 kWh, outside 7.6 °C2026-01-18: 12.7 kWh, outside 7.7 °C2026-01-19: 12.8 kWh, outside 7.7 °C2026-01-20: 13.4 kWh, outside 8.2 °C2026-01-21: 12.7 kWh, outside 7.6 °C2026-01-22: 13 kWh, outside 7.7 °C2026-01-23: 15.4 kWh, outside 6.8 °C2026-01-24: 18.3 kWh, outside 6.5 °C2026-01-25: 19.3 kWh, outside 5.7 °C2026-01-26: 21.4 kWh, outside 4.5 °C2026-01-27: 21.8 kWh, outside 6.3 °C2026-01-28: 21.8 kWh, outside 3.9 °C2026-01-29: 16.5 kWh, outside 3 °C2026-01-30: 13.2 kWh, outside 6.7 °C2026-01-31: 10.3 kWh, outside 6.6 °C2026-02-01: 1.5 kWh, outside 7.4 °C2026-02-02: 15.9 kWh, outside 6.5 °C2026-02-03: 18.2 kWh, outside 4.4 °C2026-02-04: 0 kWh, outside 4.6 °Cdaily COP (heat ÷ electricity)1352026-01-05: COP 2.352026-01-06: COP 2.32026-01-07: COP 2.662026-01-08: COP 2.712026-01-09: COP 2.912026-01-10: COP 2.62026-01-11: COP 2.232026-01-12: COP 3.632026-01-13: COP 3.642026-01-14: COP 3.072026-01-15: COP 3.632026-01-16: COP 3.472026-01-17: COP 3.722026-01-18: COP 3.052026-01-19: COP 3.482026-01-20: COP 3.562026-01-21: COP 3.612026-01-22: COP 3.622026-01-23: COP 3.442026-01-24: COP 3.252026-01-25: COP 2.942026-01-26: COP 3.132026-01-27: COP 3.242026-01-28: COP 2.862026-01-29: COP 2.992026-01-30: COP 3.62026-01-31: COP 3.522026-02-01: COP 42026-02-02: COP 3.582026-02-03: COP 3.0301-0501-0901-1301-1701-2101-2501-2902-02
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060-8-5-214710outdoor 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.