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Ecoste
@ecoste
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Eminent Member
Joined: Oct 27, 2025
Last seen: Mar 25, 2026
Profile Activity
Topics: 1 / Replies: 40
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Reply
RE: Mitsubishi Ecodan R290 10kW performance

@jamespa No cycling, flow temp varies by less than 2 degrees, return is very stable. Today it is running at 38C varying by less 2C, since water heatin...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan R290 10kW performance

@jamespa Here's an update to my previous post. Mitsubishi engaged a subcontractor to investigate the poor performance of my heat pump. He concluded th...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Share Your Experiences with Heat Pump Manufacturer Support

@cold123456 Mitsubishi has failed to respond to my complaint. On 16 November I sent a formal complaint to Mitsubishi specifying that they had suppl...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Don’t Install a Heat Pump Until You Read This

@editor I was surprised to read your praise for Mitsubishi for remote connectivity and telephone support for diagnosing problems. Here's my experience...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan R290 10kW performance

@jamespa That is an acceptance by the installer, the problem is with Mitsubishi, it is their unit that is faulty. They have required payment to invest...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan R290 10kW performance

@jamespa Time for an update. My installer has been to visit and has confirmed that the heat pump is faulty. He has contacted Mitsubishi. They have req...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan R290 10kW performance

@jamespa I agree, I have the installer visiting tomorrow. Unfortunately Mitsubishi will not engage with me and insist that they deal with the installe...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan R290 10kW performance

@sheriff-fatman Thank you. Like you I am not chasing a particular COP, I am using COP to demonstrate the poor efficiency and hence the high cost. I ha...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mitsubishi Ecodan R290 10kW performance

@dgclimatecontrol I only have 1 cylinder and I can confirm that the Ecodan is set to standard, which I understand means that the heat pump alone heats...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan R290 10kW performance

@dgclimatecontrol I am on an Octopus Intelligent Go Tariff, so I tend to heat my water when that starts and then heat the house for the remaining dura...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan R290 10kW performance

@jamespa Thank you, just need to get it fixed!

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mitsubishi Ecodan R290 10kW performance

Thank you for the responses. 3.4kW is in line with calculations and data that I collected last winter before having the heat pump fitted. I don’t ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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