Buffer tank and secondary pumps. Do I need them?

By jimseng
December 24, 2025 in Air Source Heat Pumps (ASHP)

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https://forum.buildhub.org.uk/topic/46234-buffer-tank-and-secondary-pumps-do-i-need-them/

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jimseng

Posted yesterday at 12:39

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Posted yesterday at 12:39

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Really wouldn't to hung up on the UFH that has been installed,

Indeed. This is becoming an academic exercise but I am interested in getting some calculations as a base line. Everybody here has really helped me get a better idea of what's involved.

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Nickfromwales

December 24, 2025

Hi. Something’s not right if your design flow temp is as high as 35°! GF UFH, I assume, is going into a slab? If so, 35° into that will cause the house to overheat. You should be mid-high

JohnMo

December 25, 2025

That's a strange lunch your cooking up.

JohnMo

December 24, 2025

Generally never required with sensible design. What size? Good. So basically the design should look something like this. Two floors if the same design flow temp