Unvented discharge waste pie

[mfgs]

What manufacturer and pipe/fittings do you guys use for waste pipe when running a discharge from an unvented cylinder to a soil stack?

 

[SimonG]

I always go outside.

 

[ShaunCorbs]

High temp mupvc solvent weld

 

[Last Plumber]

What manufacturer and pipe/fittings do you guys use for waste pipe when running a discharge from an unvented cylinder to a soil stack?

Will the plastic soil stack take the heat?
I normally run direct to outside in metal. Make sure it is visible and terminated correctly.

 

[mfgs]

I normally aim for discharge outside too. Unfortunately I cant on this one. Is high temp Mupvc allowed? I thought it had to be pushfit? I never use pushfit wastes for anything, so not sure which is correct material

 

[townfanjon]

Yes should be pushfit but has to be able to take hight temps as does the soil pipe .

 

[ShaunCorbs]

Yes mupvc is allowed and approved

 

[mfgs]

Shaun, could you please provide a link to the regs saying that its ok? All I can find is it saying it should be pushfit and polyethylene or polybutalene

 

[ShaunCorbs]

Yes np

 

[mfgs]

Thanks Shaun.
What manufacturer of push fit pipe do people use for this purpose?

 

[ShaunCorbs]

Can’t find it now will look later

 

[Last Plumber]

Is high temp Mupvc allowed?

Here, read through this link paragraph 3.60

 

[mfgs]

Here, read through this link paragraph 3.60

That's what I was looking at and couldn't see any mention of Mupvc?

 

[Last Plumber]

That's what I was looking at and couldn't see any mention of Mupvc?

No, well, like all other rules and regs, you are supposed to use your interpretation of those rules and regs and be able to demonstrate should it prove necessary that you - being the responsible person - did the right thing in the eyes of other professionals in your own field who may be judging your work after the fact, so to speak.

We all know that the possibility of melting a soil pipe with a constant flow of boiling water is slim but it 'could' happen. You need to think worst case scenario at times like this.

That's why I always take them outside in metal and terminate them as per the rules. Until of course someone gives it to me in writing that the plastic will handle a constant flow of boiling water (if you can get that from the manufacturer, brilliant). Until then and where I am concerned, it's a case of my way....relocate the unit.....or get someone else to do it for you.

I am about to replace a small water heater in a School. The previous installers have left a disaster waiting to happen. The unit has been in ten years with no expansion vessel, a stop tap after the PRV and the D1 directly into a plastic waste and then soil pipe. They have never inspected the anode inside either, hence the failure.

Thing is, nothing did happen (apart from a rusty leak), so they got away with it.
Lucky eh?

 

[Last Plumber]

You can get info from the pipe manufacturers and some do say up to a certain temp.

 

[mfgs]

Can’t find it now will look later

I don't suppose you managed to find it did you?

 

[ShaunCorbs]

I don't suppose you managed to find it did you?

Only what last posted but if you have a look on hunters website it lists the specs for mupvc which are high temp resistant etc

 

[Aire]

Does this help?