safety valve

[scuddmann]

Hi guy's newbie here I live in Kent and need an answer to a question that I am having a disagrement with my plumber, just had a worcester condencing boiler fitted and I would like to have the safety valve plumbed into a soil stack in my downstairs bog, I thought this could be down with a tundish and then just run to the stack via a trap, you see the boiler is 10 meters away from an outside wall and a real pain as the pipe would be on show in my living room, also where it would need to terminate outside is where my dogs live, I really do not want scalding water on them!!!! the flue goes up through a flat roof and is ok, the condensing pipe is also run to the stack with no hassels, however my plumber say's it must be run out side, but Atmos boilers seem to do a joint condens and safety valve set up straight into a soil stack, anyone got any idea's? much appreciated, David

 

[GQuigley67]

don't see why it can't go into a tundish and into drain, as long as there is an air break then should be fine so you can see the water discharging.

 

[tamz]

If you really must, it can be done through a HepVo trap and high temperature plastic but it is not ideal.

 

[scuddmann]

Thanks guy's I just need it to be legal within building/plumbing regs, cheers, David

 

[markproperjob]

regulations insist that PRV vent pipe must have a visable/audible warning method, IE a tun-dish!
as long as the tun-dish is sited where it is visable and the resultant gurgling can be heard, soil stack disposal is perfectly acceptable.
get your plumber to refer to the WRAS (water regulations advisory scheme) to verify this.
i did years ago, in exactly same scenario, thats how i learnt of the regs on this topic.
if prv was simply vented into soil stack 'blind', your system could be dripping precious water into the drains forever, and you would never know......
hope this helps.
mark

 

[oldplumber]

straight from the wb installation guide:min 15mm copper pipe,run downwards preferably to external drain/soakaway. so any traps etc on the pipework arent a good idea as youll find a lot of steam or boiling water escaping via the tundish as that becomes the easier option rather than flowing through a restictive trap. So youll get scalded kids or inlaws, which in my mind is worse than damaged dogs. Personally, I check and agree on a boiler position to prevent this issue arising at the start, but if I was installing the boiler then a run through the lounge to the outside would be my choice or I wouldnt commission the boiler untilr wb had given me in writing their alternative options if there is one.

 

[scuddmann]

Thanks oldplumber, I hear and understand what you are saying, and agree to some extent however I have no children or inlaws and the boiler is located in a locked airing cupboard, this is the only space in the hose that it can be fitted, believe it or not, modern houses are rather small and cramped, so I will be looking at the WRAS documents that Mark suggests, as a trained electrician my plumbing knowledge of the regs is limited but water and steam squirting onto an external wall is not my idea of safe? and I know my doggies would agree with me, stilln it is good to have a variety of views and we are all always learning the skills of our trade's again thanks for the reply Markproperjob/oldplumber, my gratitude, David