Draining down unvented system including underfloor heating

[Marty1979]

Hello folks

I haven't had any experience working on radiators when it comes to replacing them on Unvented/sealed systems which include underfloor heating.

My question is more geared towards when draininh down, would I need to open the 3 port valve or two port valves to drain down a system? Does that drain down the underfloor heating, too?

Don't want any nasty surprises that's all when I think that'd I'd drain the heating side.

Thank you from a level 2 student

Martyn

 

[ShaunCorbs]

Depends if your replacing the valves you would need to drain below these

If your just replacing the rad shut the valves and drain it with a tub

 

[Ric2013]

Bear in mind the UFH pipes under the floor may well be fed from a manifold above the floor and, as such, gravity being what it is, will always have some water in them. But, as long as it stays put, it isn't usually an issue.

 

[Marty1979]

Depends if your replacing the valves you would need to drain below these

If your just replacing the rad shut the valves and drain it with a tub

Thanks very much Shaun mate

 

[Marty1979]

Bear in mind the UFH pipes under the floor may well be fed from a manifold above the floor and, as such, gravity being what it is, will always have some water in them. But, as long as it stays put, it isn't usually an issue.

Thanks also Ric mate