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How many pumps on electric wet UFH?

Sparkingchip
e38d8cc3302cf938da52d43aa890931c-huge-20210407_132827.jpg


I am being told that wet UFH only needs one pump located on the UFH manifold and UFH circuits. 


My understanding is that it  needs two pumps, one for the boiler circuit and one for the UFH circuits as they are two distinct circuits. 


Seeing as you are all experts on circuit arrangements, tell me if the UFH manifold pump can circulate the water through the boiler without a boiler circuit pump installed?
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    I was a bit perplexed at first because I couldn't work out how the supply of hot water could be heated without a boiler pump. Then I noticed that you mentioned "electric boiler" so, presumably, hot water is heated by an immersion heater.


    I don't think that any manifold should call for heat until at least one valve is fully open. If bog-standard S-plan can manage it, why not UFH?


    I don't see any need for a bypass if this is done properly. If there is one, but no boiler pump, how would the water flow through it? ?
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  • 0
    I was a bit perplexed at first because I couldn't work out how the supply of hot water could be heated without a boiler pump. Then I noticed that you mentioned "electric boiler" so, presumably, hot water is heated by an immersion heater.


    I don't think that any manifold should call for heat until at least one valve is fully open. If bog-standard S-plan can manage it, why not UFH?


    I don't see any need for a bypass if this is done properly. If there is one, but no boiler pump, how would the water flow through it? ?
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