Blow off

[AllyBongo]

Fitting a boiler in the centre off a house, house has concrete floors. The condensate is going into a bath waste, can the blow off go through a tundish then into the waste pipe along with the condensate.

 

[Barry98]

If its your only option , and the tundish is visible . Sometimes worth checking a with manufactorer

 

[ambrosia]

plastic pipe can only work to certain temperatures, i'm guessing the trap isnt an old school copper one

 

[Rickster123]

There is a condensate pump available that will take both the condense and the prv.

 

[AllyBongo]

The bathroom is getting done, so the trap will be brand new. Thought about a pump, but dont want extra expense if its not needed

 

[AWheating]

ask the boiler manufacture if you can fit a prv remote from the boiler on a outside wall. ie under a rad.

 

[Leo21]

You'll have to make sure it's trapped if you use a tundish into the bath waste to avoid smells.

 

[Mike Jackson]

How about a high level kit if the place has a loft.

 

[REDSAW]

fit a prv to the flow pipe near a rad and exit through to outside wall, turn the prv on the boiler to the flow pipe.
when one blows they both blow..

 

[Leo21]

fit a prv to the flow pipe near a rad and exit through to outside wall, turn the prv on the boiler to the flow pipe.
when one blows they both blow..

Very clever, would the manufacturers be ok with that?

 

[GasmanxxxR1]

Very clever, would the manufacturers be ok with that?

I know worcester dont allow it but baxi do. You just have to contact the manufacturers

 

[buckley plumb]

from memory its ok to put an unvented cylinder blow off into a soil but not a combi boiler blow off why i dont know . as mentioned some boiler manufacturers do a remote prv . main and baxi also do a combined condense prv pump . ore the visseman boiler has its prv and condense combined .

 

[Doodlebug]

Fitting a boiler in the centre off a house, house has concrete floors. The condensate is going into a bath waste, can the blow off go through a tundish then into the waste pipe along with the condensate.

Sounds like you got no other option, I would check with the manufacture first

 

[GrahamM]

from memory its ok to put an unvented cylinder blow off into a soil but not a combi boiler blow off why i dont know . as mentioned some boiler manufacturers do a remote prv . main and baxi also do a combined condense prv pump . ore the visseman boiler has its prv and condense combined .

Is it not something to do with not being permitted to dispose of chemical treated central heating water into waste?

 

[Leo21]

No, I think it's because it has to be visible so repairs will be made. The same as an overflow or tundish.

 

[buckley plumb]

always wondered what you do with prv in boiler when you fit a remote one to a combi

 

[Mike Jackson]

I first came across them with Ideal boilers. The existing PRV is piped into the return and the return is taken up and over and a new PRV rated at 2.5bar is fitted to the pipework in the roof space or floor above.

 

[Barry98]

I first came across them with Ideal boilers. The existing PRV is piped into the return and the return is taken up and over and a new PRV rated at 2.5bar is fitted to the pipework in the roof space or floor above.

might be worth the next time one of us does this to take a few photos , ive only done it once myself in a cellar , ill take some if i go back for service

 

[AllyBongo]

Spoke to Vaillant about this one today, they say no to a tundish then into a plastic waste pipe. They advised on a remote PRV kit which is manufactured by them. The other method they said is accepted is to put the PRV pipe work into an F&E tank with a lid on it below the boiler (Which ain't going to look good!!) Do some manufacturer's give the ok for the tundish method?

 

[AWheating]

imo its not up to the manufactures to say wether running to an internal waste is ok, its a building control/building regulations issue as the boiler will work as designed either way if fitted correctly. They do want to sell you there remote prv kit tho 🙂

 

[AllyBongo]

Hmmm.... So what do building control say about it? I remember when I was serving my time, we fitted Vokera's in high rise flats, and the PRV's all went through a tundish into a stack

 

[Leo21]

I'd still use a tundish. If an engineer has to go out he won't spot it anyway. And you know it's a good way of doin it.

 

[arran197]

I think the tundish is a decent way of getting around the issue that isn't going to cost the earth. I have seen it done before a few times, some of them more successfully than others. Actually sourcing a tundish can be a pain, Plumb Center don't usually stock them, or know what you're on about when you ask.