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Next steps on my ASHP journey: Radiators and Pipework

 
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Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 1 hour ago
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JamesPa
 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 5397
12/09/2026 6:46 pm  

Posted by: @rob-of-york
↑

Does this set up mean that I should reject having a volumiser or a buffer in the heat pump system design, since the water volumes already in the radiators make them unnecessary, or is there some other valid purpose for having these present?

You should (amost) always reject having a buffer, by which I mean any kind of tank between the heat pump and emitters that is connected both to feed and return.

A volumiser (by which I mean a tank in either the feed (preferable) or the return (OK) and plumbed in such a position that it is not engaged when DHW is being heated), will do no harm, so if an installer wants to fit one and there is space, I wouldn't make a great song and dance about it.  It might just make defrost a bit quicker and/or smooth cooling during defrost, but possibly not a lot.

 


4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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