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JamesPa
JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Oct 6, 2026
Profile Activity
Topics: 27 / Replies: 5455
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Reply
RE: Harvest Thermal - ASHP with a smart thermal battery

As its using ToU tarrifs then its totally believable so long as it heats the water to a reasonably high temperature when leccy is cheap. Basically ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Hypothetical House Design

Why do you want to maintain a specific deltaT? The output of the emitter (which is what you really care about, because it needs to balance the heat l...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Helium heat pumps

I dont think it is correct, given that @ashp-bobba described how the defrost cycle of an A2A het pump works just a few weeks ago.  

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Help me keep the faith with my air source heat pump installation

I didn't know about those, they look like good pieces of kit. They are about £30 eachplus VAT It would be pretty mean IMHO of an installer not to d...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Hypothetical House Design

My first question is why bother with the auto balancing valves, what value are they adding (other than to confuse matters). Why not just normal manu...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: BUS uplift to 9k for off grid installs. I can't establish if new builds are specifically excluded.

The answer to that is at the whim of global despots (and others).  

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Helium heat pumps

I think the best advice is - if you want a heat pump get a heat pump. Even though the underlying technology is over 100 years old, its application to...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat pump design review please: 5 kW Vaillant aroTHERM Plus heat pump

Thats a fair comment when no tap is open. There will however be a dynamic loss once a tap is open, which I think is the sum of the loss in the pipe w...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat pump design review please: 5 kW Vaillant aroTHERM Plus heat pump

OK fair enough, just asking. Its possible to do pressure loss/flow rate calculations if you know the pipe length and roughly the number of bends see...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat pump design review please: 5 kW Vaillant aroTHERM Plus heat pump

Whats your mains pressure like, what sort of flow do you get at the cold water tap furthest from the incomer. If you have good mains pressure and/or ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat pump installation quotations

@sttpd1917 Whats your current gas annual usage, does your house cool a lot at times or stay reasonably warm, do you have half hourly meter readings...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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