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SUNandAIR
SUNandAIR
@sunandair
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Joined: Dec 30, 2022
Last seen: Jul 9, 2025
Profile Activity
Topics: 5 / Replies: 495
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RE: buffer/volumizer cupboard space eater, do i need one?

@heacol I’ve also herd that a volumiser can help with short cycling. I wondered if short cycling would be reduced if it was caused by mild outdoor a...

4 months ago
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Air Source Heat Pumps (ASHPs)
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RE: buffer/volumizer cupboard space eater, do i need one?

Just to confirm… our system does not have a volumiser, buffer tank or LLH. Here is a chart showing how our defrosts occur. There is a 2 or 3 minute...

4 months ago
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Air Source Heat Pumps (ASHPs)
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RE: buffer/volumizer cupboard space eater, do i need one?

I didn’t see your earlier reply to @old_scientist which goes a lot further in detail. Which is pretty convincing. ive copied it here for a reminder....

4 months ago
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Air Source Heat Pumps (ASHPs)
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RE: buffer/volumizer cupboard space eater, do i need one?

There are some compelling arguments for putting the volume on the flow side and I’m almost persuaded. However the emphasis appears more weighted on de...

4 months ago
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Air Source Heat Pumps (ASHPs)
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RE: buffer/volumizer cupboard space eater, do i need one?

@jamespa thanks for the thoughtful reply. Would be interesting how the replies pan out.

4 months ago
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Air Source Heat Pumps (ASHPs)
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RE: buffer/volumizer cupboard space eater, do i need one?

Great answers @old_scientist. One other query I have with position G is - the location is on the return side…. after the DHW cycle the system feeds 50...

4 months ago
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Air Source Heat Pumps (ASHPs)
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RE: buffer/volumizer cupboard space eater, do i need one?

So... where would you install the volimiser? See choices in the attached sketch. I think this will help to resolve some nagging inconsistencies in pre...

4 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Oversized Ecodan

If your UFH is a high mass construction you may be able to store quite a bit of heat so you can run the heating above the cycling temperature or to a ...

4 months ago
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Air Source Heat Pumps (ASHPs)
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RE: Ecodan Energy Monitoring Pack

I recall some basic maths kwh= LPS X DT X SHC Where the SHC is specific heat carrying capacity (SHC of water is usually quoted as 4.2 whereas glyc...

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

Hi @jamespa I’ve been travelling for a few days and felt I needed to address some unanswered messages from you. I think and hope we just had some ...

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

Sorry James the radiator output is governed by temperature of the water inside them and the lower the flow temperature the slower and sustainable the ...

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

I think Rob Berridge states on this episode that you can’t have “too much” radiator capacity on a HP installetion (if you want the quote try 12 mi...

5 months ago
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Air Source Heat Pumps (ASHPs)
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