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JamesPa
@jamespa
Moderator
Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 12, 2025
Topics: 17 / Replies: 2685
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RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW

@CBrenewable @ashp-bobba seems to be on the case so I will step out for now to avoid possible confusion, name check me if you want me to step back i...

4 months ago
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RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

yes thanks! Im not sure I can really comment further as your key concern (unless I misunderstand you) seems to be the thermal offs which appear to b...

4 months ago
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RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW

I cant immediately see anything wrong but I also cant follow the pipework. As you say this is a poor time to test/set things up, but I would still ...

4 months ago
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RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW

Great. If you could post a picture of the area around the cylinder it would confirm that there is nothing untoward here.

4 months ago
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RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

Can you explain what you mean by 'off' please? If they are off how is that affecting the heat pump/circuits. If you are getting a SCOP of 3.5 what ...

4 months ago
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RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW

@cbrenewable Hopefully the diagram shows one of the valves in the wrong place, otherwise there is a valve in the wrong place. Any idea why two pumps...

4 months ago
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RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

@trebor12345 Hi. What is it you are still trying to solve/understand. I will see if I can help. Definitely that is a 4 port buffer.

4 months ago
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RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW

@CBrenewable A COP of 2.4 is definitely low and you are right to be concerned. You should be seeing 4 or better at present. Can you tell us s...

4 months ago
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