UFH under walk-in shower, bed, wardrobes?

[Olf]

I'm fiddling with Loopcad and got to something like:

I drew the circuit under the walk-in shower (ignore the shower tray symbol), but a) can it be installed there at all, b) will it work sensibly with all the tanking layers, c) am I not better off with electric UFH in that area, as it will make the tiles nice to stand on all year round, not only in heating season.

 

The opposite problem is with the bed: I can't see it going anywhere else, but missus claims she might want to change the layout one day. To be honest I see now much less harm in running pipes under the bed: if they cannot release the heat there, so be it.

 

Which probably can be extended to the wardrobes too: even if the output will be heavily reduced, it always adds up a bit.

 

[PeterW]

What is the floor construction method ..? 
 

Under the furniture is fine, under the tray or WC pan is a no. 

[Olf]

Floor 100m concrete on 150mm PIR on DPM on sand blinding on the ground.

 

What makes WC pan bad for UFH underneath? 

 

Tray is only symbolic, it will be a tiled wetroom surface - but with tanking underneath I myself doubt it will work well with wet UFH. Should I look straight at electric UFH in that area?

[Dudda]

It's fine under the tray just not that close to the waste. The shower waste tray always contains water to stop the smell getting into the room. The UFH can dry out the waste trap which if it's not used daily.  The WC Pan is fixed to the ground usually so you don't want the UFH pipe punctured. If it's a wall hung WC I'd continue the UFH under it.