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CBrenewable
@cbrenewable
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Eminent Member
Joined: Apr 16, 2025
Last seen: Apr 24, 2025
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Topics: 1 / Replies: 15
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RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW

@ashp-bobba and @jamespa - thank you both for all your help with this, it's much appreciated. I fully understand it's not easy to see what's going on ...

3 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW

@ashp-bobba - yes that all looks correct. Pump 1 is on the flow and Pump 2 is on the return.

3 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW

@ashp-bobba Thanks. I've checked the arrows and confirm both point in the correct direction. I note your concern over whether both are needed. Assum...

3 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW

@davidnolan22 - Screenshot of energy input/output attached. System was commissioned on 8th April. Note: value for 16th is significantly higher sin...

3 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW

@ashp-bobba - your arrows on the picture are correct. I've followed the pipes just now and confirmed this. How could I check the pumps are insta...

3 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW

@jamespa - Yes, 0.5bar is the max on that bypass valve. Range = 0.1 - 0.5 bar. How would I validate that the pumps aren't fighting each other? T...

3 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW

@ashp-bobba - thanks for the detailed thoughts. I'm aware that my rads upstairs seem to be working well and I have a reasonable density of rads in n...

3 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW

Yes - the return pipe is the one with the filter and is showing in the picture.

3 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW

Additional photos of the system here - you can see how hard it is to follow the pipes (but at least it's a nice compact install like I asked for!)

3 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW

Heat Loss Calcs and a pic of the system included here:

3 weeks ago
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Air Source Heat Pumps (ASHPs)
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RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW

@jamespa - yes, looks like I made a mistake on the diagram. I asked for the install to be quite compact in a corner of the garage so it's a little tri...

3 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW

@jamespa - Property is a 1990ish 3 bed 2 story semi-detached house. Fully double glazed. Only about 100mm of loft insulation which I already plan to d...

3 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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