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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Nov 14, 2025
Profile Activity
Topics: 18 / Replies: 3361
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RE: Is My Midea Heat Pump Inherently Defective?

I don't think you can say 'This is not how a heat pump is supposed to run'. SOFAIK there is nothing wrong with operating a fixed flow rate (and thus ...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP and how it should run and potential kw consumption?

abut 1.5 bar, but I dont think it matters much unless you have a very tall house (it merely needs to be sufficient to ensure that negative pressure do...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP and how it should run and potential kw consumption?

Those cops sounds pretty close to what I see (7kW house, 7kW Arotherm). My energy delivered is currently tracking fairly close to what my measured ga...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Double heat pump for DHW?

And, as an added bonus, the bed sheets won't need to be changed quite so frequently!

11 months ago
Forum
Domestic Hot Water & Cylinders
Reply
RE: ASHP and how it should run and potential kw consumption?

Like any heating system the consumption will depend on outside temperature. At the design minimum temperature you need to deliver roughly twice as mu...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Double heat pump for DHW?

An arrangement which recognises that this is a modern totally unnecessary extravagance? Or as @iaack suggests, waste water heat recovery Or just s...

11 months ago
Forum
Domestic Hot Water & Cylinders
Reply
RE: Best control strategies for heat pumps that are way oversized

Pretty much I'm coming to that conclusion, TBH it was my hunch when I started this thread but I wanted (and still want) to see if anyone comes up with...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Hitachi Yutaki M efficient operation

No idea because not sure what they refer to. What's the context and what are the units and factory defaults? Mostly I would say leave things at...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Best control strategies for heat pumps that are way oversized

Some manufacturers publish this data including (but not limited to) Midea, Mitsubishi, Vaillant. Its not always easy to find, Mideas is in a password...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Best control strategies for heat pumps that are way oversized

We don't and they may well be overstated. Certainly there is a reduction in efficiency because the heat pump has to run at a higher ft, but this migh...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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