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Old 03-08-22, 02:37 AM   #19
Robl
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Join Date: Oct 2020
Location: Cambridge, UK
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External heat sources like monobloc ashp, or pipes that might freeze up, could be protected from frost damage with an anti freeze valve. Its just a valve at the lowest point in the plumbing, that opens a bit when the temperature falls below 3C or so, to prevent freeze damage. Once it’s opened, slightly warmer water is present, and it will close again for a while. Link to one below.

https://www.seconrenewables.com/heat...lve-7537-p.asp
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