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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 12, 2025
Profile Activity
Topics: 17 / Replies: 2835
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

Sorry but fundamentally you have to. The rate at which energy is absorbed by the emitters is determined by the flow temperature and the pipe area ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

OK. I think your theory, if it applies at all, applies to a small minority of use cases. The vast majority of our housing stock doesn't have UFH an...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Running my new Nibe ASHP efficiently

Yes, its the 'integral' term in a proportional - integral - differential' controller. Vaillant actually call it the 'energy integral', the units are ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Running my new Nibe ASHP efficiently

Vaillant have the same concept. Basically its the sum (actual FT - target FT) * Time. So if the actual FT is 30 and the target 35 and this remains t...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

Understood. You suggest (I think) that your data shows that oversizing is positively beneficial to performance in your case. Have I understood tha...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

Maybe best not to sound too clever, it might upset him. You might be better first to ask why he thinks you might need 2 pumps and then, if necessary,...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

Although i agree that the evidence that oversizing causes performance problems is at best shaky (albeit there are some logical arguments why it might)...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

Well that's not really a reason. If he had said "because the index circuit has a resistance that is too high for the water pump" that would be a rea...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: How do the settings on my Gen 5 Samsung ASHP sound?

A buffer tank will be a cylindrical tank other than your DHW tank, or could be attached to your DHW tank.

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Avoid the Heat Pump Villain: Why Low-Loss Headers and Buffers Can Sabotage Your Heat Pump's Efficiency

It's unlikely you need 2 pumps, did he say why?

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: How do the settings on my Gen 5 Samsung ASHP sound?

In that case Id perhaps expect your loss to be less. Do you have a buffer tank and if so how many ports (usually 2 or 4). How are the upstairs radia...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: How do the settings on my Gen 5 Samsung ASHP sound?

Difficult to say without more information about the house however, for comparison, my 200sq m 1930s house with a mish mash of fabric upgrades (includi...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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