Domestic Hot Water Pipework in screed

[bobby62]

I need to ask (or rather get the plumber) to install a domestic hot water circulation loop across a room (about 20m). The room is yet to be built and will have no roof space to run the circuit in. It must go in the floor.

It could go within the floor screed depth, the plumber mentioned barrier plastic pipe which would be run in a continuous length (a flow and a return back to the cylinder) i.e. no connections beneath the screed. Is this a common installation method? By the way the room will have underfloor heating in the screed also.

 

[Dan Robinson]

It will be fine bu you need to run it in conduit.

 

[bobby62]

It will be fine bu you need to run it in conduit.

Thanks. Can you use plastic barrier pipe for a continuous hot water circulation loop? Are you aware of any of the plastic pipework manufacturers that allow this?

 

[Dan Robinson]

Yes they all would.

You need to run it in conduit and have access panels to access any joints.

 

[bobby62]

Yes they all would.

You need to run it in conduit and have access panels to access any joints.

Thanks, I saw this line (below) in an installation instruction manual, what is classed as a 'commercial ring main'? Does that refer to systems which operate at much higher circulating temperatures than that of an unvented hot water cylinder i.e. Megaflo.

''Polybutylene pipework is not suitable for installations where high temperatures are maintained for prolonged periods such as in commercial ring main hot water storage systems.''

 

[Dan Robinson]

Unless you are dealing with a commercial ring main, I wouldn't worry.

*EDIT*

 

[bobby62]

Unless you are dealing with a commercial ring main, I would worry.

What would you class as a commercial ring main?

 

[matt1e]

Unless you are dealing with a commercial ring main, I would worry.

What would you class as a commercial ring main?

A secondary return in commercial premises

as Dan has stated I wouldn't worry, as you are unlikly to be circulating DHW continuously at anywhere near 65 degrees C

Matt

 

[bobby62]

Unless you are dealing with a commercial ring main, I would worry.

What would you class as a commercial ring main?

A secondary return in commercial premises

as Dan has stated I wouldn't worry, as you are unlikly to be circulating DHW continuously at anywhere near 65 degrees C

Matt

Which manufacturer pipework would you recommend, have you ever installed a secondary loop in commercial premises with plastic?

 

[bobby62]

Just found out Maincor is suitable for this. The pipework has the aluminium barrier