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Buffer tank - CH and UFH pumps question

 
Air Source Heat Pumps (ASHPs)
Last Post by andygo 3 years ago
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 andygo
(@andygo)
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Joined: 3 years ago
Posts: 20
Topic starter 06/03/2022 10:20 pm  
Hi
I'm currently having an arotherm 7kw ASHP and unistor cylinder installed.
 
The plumbers are just waiting to fit the buffer tank....
 
I've got a question about how they plan to connect the UFH and radiator circuits to the buffer.
image
image
 
The UFH and CH will share the feed and return to the buffer tank.
 
The way it's going to work is water will come from the Buffer into a Post Buffer Pump (black in the pics). 
 
Then there is a T for the pipes to separate for CH and UFH. Both then have motorized valves.
 
The UFH is pretty basic with no manifold - just a flow and return and a mixing valve (yellow).
The UFH also has a circulating pump (red).
The CH will be circulated using the the Post Buffer Pump.
 
I would like the UFH and CH circuit to operate independently from each other. We'll probably have the UFH on most of the the time and the CH in early morning and evening.
 
The plumber says in order for the UFH to it to work both the Post Buffer Pump AND the UFH circulating pump need to be on.
 
We only have 28m2 of UFH so having two pumps for that seems like a waste of energy to me. I  also wonder if it will cause other problems (compete against each other? flow rate too fast?)
 
Is there a better way of doing it? 
 
Should the UFH either have a separate flow and return to the buffer or at least T off before the CH pump not after it .... or doesn't it matter?
 
Appreciate any advice.
 

   
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