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Home / system #1136

Grant Aerona HP290

Compton and Shawford, Hampshire · Detached · 265 m² · 1900 to 1939 · 15.5 kW · radiators

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

5 Jan – 4 Feb 2026 (winter reference)

155 hourly rows · MID-class heat meter present: yes
4.07efficiency (COP) over 155 hours, from the heat meter
better than 81% of the metered fleet in January 2026
Electricity used
252 kWh
Heat delivered
1025 kWh (heat meter)
Estimate without heat meter
flow sensor 4.11 · temperature model 3.77
Mean outdoor temperature
7.3 °C · 147 space-heating hours
Flow temperature at 0 °C outside
37.4 °C (curve slope -0.31 per K)
Flow − return while heating
3.4 K
House needs at −3 °C
9.8 kW (unit rated 15.5 kW) · fit r² 0.12
Hot water
9% of electricity, COP 2.91
infoNo configuration faults detected in this window
Keep the current settings. We will alert you if efficiency drifts.

Day by day

electricity per daydaily COP3.0 floor
electricity, kWh per day027552026-01-28: 19.4 kWh, outside 7 °C2026-01-29: 54.5 kWh, outside 5.9 °C2026-01-30: 42.5 kWh, outside 8.6 °C2026-01-31: 37.6 kWh, outside 8.5 °C2026-02-01: 26.5 kWh, outside 7.7 °C2026-02-02: 32.1 kWh, outside 7.5 °C2026-02-03: 38.1 kWh, outside 5.8 °C2026-02-04: 1.1 kWh, outside 5.6 °Cdaily COP (heat ÷ electricity)1352026-01-28: COP 3.822026-01-29: COP 3.62026-01-30: COP 4.132026-01-31: COP 4.122026-02-01: COP 4.632026-02-02: COP 4.312026-02-03: COP 4.142026-02-04: COP 4.7201-2801-2901-3001-3102-0102-0202-0302-04
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
203040506023456789101112outdoor 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.