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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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    Could you make your diagram a little larger - my eyes are too old!


    In general two pumps are used as the boiler circuit runs at a higher temperature than the UFH, so a secondary pump runs the (same) water around the UFH and the blending valve, just pulling a little of the hotter water from the boiler side as needed to keep the UFH at the right temperature. More like an adjustable autotransformer than galvanically isolated circuits, if you like.


    If on the other hand you can arrange things so that the boiler runs at the desired UFH temperature, I don't see why it can't be done with a single pump.


       - Andy.
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  • 0
    Could you make your diagram a little larger - my eyes are too old!


    In general two pumps are used as the boiler circuit runs at a higher temperature than the UFH, so a secondary pump runs the (same) water around the UFH and the blending valve, just pulling a little of the hotter water from the boiler side as needed to keep the UFH at the right temperature. More like an adjustable autotransformer than galvanically isolated circuits, if you like.


    If on the other hand you can arrange things so that the boiler runs at the desired UFH temperature, I don't see why it can't be done with a single pump.


       - Andy.
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