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Home / system #1304

Grant Aerona HP290

Poole, Dorset · Detached · 190 m² · 1940 to 1982 · 15.5 kW · radiators · installed by Octopus Energy Services

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

Last 7 days

169 hourly rows · MID-class heat meter present: no
5.68efficiency (COP) over 169 hours, from the heat meter
better than 99% of the metered fleet in January 2026
Electricity used
138 kWh
Heat delivered
781 kWh (heat meter)
Estimate without heat meter
flow sensor 5.06 · temperature model 4.60
Mean outdoor temperature
10.0 °C · 106 space-heating hours
Flow temperature at 0 °C outside
42.6 °C (curve slope -1.15 per K)
Flow − return while heating
3.0 K
House needs at −3 °C
9.7 kW (unit rated 15.5 kW) · fit r² 0.06
Hot water
34% of electricity, COP 4.44
warningHot water uses 34% of electricity at COP 4.44
Lower the tank target to 45–48 °C, heat water once a day in the warmest hours, and disable weekly legionella cycles unless required.

Day by day

electricity per daydaily COP3.0 floor
electricity, kWh per day012242026-10-31: 13.9 kWh, outside 11.7 °C2026-11-01: 17.6 kWh, outside 8.9 °C2026-11-02: 15.2 kWh, outside 10.4 °C2026-11-03: 20.3 kWh, outside 9.6 °C2026-11-04: 21.1 kWh, outside 9.5 °C2026-11-05: 23.6 kWh, outside 9.5 °C2026-11-06: 19 kWh, outside 10.4 °C2026-11-07: 6.9 kWh, outside 10.5 °Cdaily COP (heat ÷ electricity)1352026-10-31: COP 4.882026-11-01: COP 5.812026-11-02: COP 5.842026-11-03: COP 5.642026-11-04: COP 5.792026-11-05: COP 5.422026-11-06: COP 6.262026-11-07: COP 5.6310-3111-0111-0211-0311-0411-0511-0611-07
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
203040506067891011121314outdoor 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.