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Mitsubishi Ecodan R290 10kW performance

 
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Air Source Heat Pumps (ASHPs)
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 Sheriff Fatman
(@sheriff-fatman)
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Joined: 8 months ago
Posts: 146
22/12/2025 8:54 pm  

@ecoste For what it's worth, this is my equivalent data for the same time period which had the same external temperature (8°C) as yours was reporting.  The outputs are via Mel Pump and the Open Energy Monitor configuration I've set up within Home Assistant.  My system was cycling at intervals of around 1hr 20minutes at the time, so the output isn't as stable as yours, but there are various snapshots of data in the output that might be of use as a comparative.  I've currently got the tolerance set to +3/-7 on the flow temperature target, rather than the standard +5/-5, which is a change I made at the weekend based on some older Ecodan-related posts I'd read on the forum.

I'd be happy to provide comparative data while you're investigating your own system, if it's of use to you, albeit it's from a system with an overall heating COP of 3.01 to date, so potentially not one that you're looking to emulate.  I'll caveat that with the fact that it's saving me around 55% on my energy bills relative to using gas last year, so doing a satisfactory job from a bigger picture.

Screenshot 2025 12 22 203725

chart

130m2 4 bed detached house in West Yorkshire
10kW Mitsubishi Ecodan R290 Heat Pump - Installed June 2025, currently running via Havenwise.
6.3kWp PV, 5kW Sunsynk Inverter, 3 x 5.3kWh Sunsynk Batteries
MyEnergi Zappi Charger for 1 EV (Ioniq5) and 1 PHEV (Outlander)


   
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