installing a wet ufh system from a 15mm CH leg

[glenn lj]

HI folks, is it possible/feasible/reasonable to insatll an ufh manifold and system (for a 17m2 room) from a disused CH 15mm flow and return?
I would install a 15 to 22mm reducer into a pump then a 2 port manifold then into the floor then. back into the return of the manifold. Its an old house and difficult to get a 22mm flow from the boiler and i would rather not install electric ufh into the screed. Would doing this screw up the rest of m CH, which works peachy.

thanks

glenn

 

[Timmy D]

Yes it would likely work. Has the existing system got zone valves? Is the dead leg separated from the rest of the heating? I assume not.

How do you control the current heating?

Are you gonna want to use the underfloor without the radiators?

 

[fowlerboi]

Personally at that size UFH I would want a pump on it and because its screeded its own time and temp control so go down the route of a small manifold. This will mean it needs to be tee'd into the boiler flow and not the heating flow. Basically you need a pipe back to your airing cupboard or boiler if you have a combi.