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Discuss 2 port valves or 3 ports valve ?? in the Water Underfloor Heating Advice area at PlumbersForums.net

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5
Hi guys
Is it better to have two 2 port valves or one 3 port valve to control the flow to either dhw or underfloor heating ? Cheers
 
2 ports least then if one fails you don’t loose both eg if hot water fails you have heating etc
 
It's what I'm most used to and it works so I stay with it.
As good a reason as any , ok Simon on the system already it has a flow obviously from hear pump to cyclinder , before cyclinder it t' s off one side to heating , other to dhw, on the dhw side into the cyclinder it already has a 2 port fitted to stop gravity circulation when heat pump is off , can I use this to do both jobs ? Stop gravity circulation and control dhw ?if I can all I have to do is put a 2 port on the heating side ??
 
If it’s the flow to the heat coil then yes only need one more
 
If it’s the flow to the heat coil then yes only need one more
Yep it has the existing 2 port on the heat coil flow, that's brill news , thanks very much , I might be in contact again , trying to finish our new build install, plumber very kindly went bust and decided to go at insulation installation instead 🙄
 

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