Home / system #441

Panasonic Aquarea M

Thurso · Detached · 300 m² · 1983 to 2011 · 9 kW · underfloor · installed by RDI Renewables

Last 30 days Last 7 days 5 Jan – 4 Feb 2026 (winter reference)1–31 Dec 2025

Last 7 days

169 hourly rows · MID-class heat meter present: yes

4.58efficiency (COP) over 169 hours, from the heat meter
better than 94% of the metered fleet in January 2026

Electricity used: 180 kWh
Heat delivered: 825 kWh (heat meter)
Estimate without heat meter: flow sensor 4.49 · temperature model 3.43
Mean outdoor temperature: 4.5 °C · 85 space-heating hours · cooling 0 kWh removed (1 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside: 31.0 °C (curve slope -0.26 per K)
Flow − return while heating: 3.1 K
House needs at −3 °C: 8.2 kW (unit rated 9 kW) · fit r² 0.08
Hot water: 47% of electricity, COP 3.19

warningHot water uses 47% of electricity at COP 3.19

Lower the tank target to 45–48 °C, heat water once a day in the warmest hours, and disable weekly legionella cycles unless required.

noteOwner’s note on the source site: “does this system have a booster heater”

Day by day

electricity per daydaily COP3.0 floor

Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °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.