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Home / system #441

Panasonic Aquarea M

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

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

5 Jan – 4 Feb 2026 (winter reference)

721 hourly rows · MID-class heat meter present: yes
3.84efficiency (COP) over 721 hours, from the heat meter
better than 65% of the metered fleet in January 2026
Electricity used
1306 kWh
Heat delivered
5013 kWh (heat meter)
Estimate without heat meter
flow sensor 3.96 · temperature model 3.03
Mean outdoor temperature
-0.4 °C · 535 space-heating hours · cooling 1 kWh removed (0 kWh electricity), kept out of the COP
Flow temperature at 0 °C outside
31.2 °C (curve slope 0.01 per K)
Flow − return while heating
4.6 K
House needs at −3 °C
6.9 kW (unit rated 9 kW) · fit r² 0.00
Hot water
39% of electricity, COP 2.65
warningHot water uses 39% of electricity at COP 2.65
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
electricity, kWh per day031622026-01-05: 51.8 kWh, outside -6.1 °C2026-01-06: 51.8 kWh, outside -6.4 °C2026-01-07: 49.6 kWh, outside -5.8 °C2026-01-08: 61.7 kWh, outside -1.2 °C2026-01-09: 52.3 kWh, outside 3.7 °C2026-01-10: 49.3 kWh, outside 0.8 °C2026-01-11: 39.9 kWh, outside -5.8 °C2026-01-12: 35 kWh, outside -1.4 °C2026-01-13: 45 kWh, outside 5 °C2026-01-14: 42.5 kWh, outside 4.5 °C2026-01-15: 45.1 kWh, outside 4.1 °C2026-01-16: 59.5 kWh, outside 1.9 °C2026-01-17: 37 kWh, outside -1 °C2026-01-18: 39.8 kWh, outside -0.1 °C2026-01-19: 40.7 kWh, outside -0.2 °C2026-01-20: 32.9 kWh, outside -1.4 °C2026-01-21: 33.2 kWh, outside -2 °C2026-01-22: 37.2 kWh, outside -4 °C2026-01-23: 47.5 kWh, outside -2.8 °C2026-01-24: 35.8 kWh, outside -2.1 °C2026-01-25: 40.4 kWh, outside -2.1 °C2026-01-26: 44.1 kWh, outside 2.5 °C2026-01-27: 47.7 kWh, outside 1.8 °C2026-01-28: 32.7 kWh, outside 1.8 °C2026-01-29: 41.7 kWh, outside 0.8 °C2026-01-30: 49.4 kWh, outside 0.8 °C2026-01-31: 38.1 kWh, outside 0.9 °C2026-02-01: 32.7 kWh, outside 0.8 °C2026-02-02: 47.5 kWh, outside -0.5 °C2026-02-03: 38.8 kWh, outside 0.9 °C2026-02-04: 5.7 kWh, outside 0.4 °Cdaily COP (heat ÷ electricity)1352026-01-05: COP 3.432026-01-06: COP 3.22026-01-07: COP 3.432026-01-08: COP 3.182026-01-09: COP 3.122026-01-10: COP 3.472026-01-11: COP 3.912026-01-12: COP 4.292026-01-13: COP 3.62026-01-14: COP 3.832026-01-15: COP 3.772026-01-16: COP 3.192026-01-17: COP 3.832026-01-18: COP 3.912026-01-19: COP 3.892026-01-20: COP 4.272026-01-21: COP 4.472026-01-22: COP 4.652026-01-23: COP 4.072026-01-24: COP 4.62026-01-25: COP 4.192026-01-26: COP 3.942026-01-27: COP 3.932026-01-28: COP 4.822026-01-29: COP 4.142026-01-30: COP 3.922026-01-31: COP 4.362026-02-01: COP 4.412026-02-02: COP 4.352026-02-03: COP 3.192026-02-04: COP 1.2401-0501-0901-1301-1701-2101-2501-2902-02
Daily COP needs a heat meter; days without one show electricity only.

The installed heating curve

one heating hourfitted curve50 °C
2030405060-11-8-5-214710outdoor 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.