Discuss 7 litre invented under sink heater in the USA Plumbers Advice area at PlumbersForums.net

No they shouldn't and even if it did the tundish will just overflow through the sides and expel the water but wastes do block, in fact on a number of our oil condensing pipes we would drill holes in top of external run so if a waste was to block it wouldn't flood the burner, it's a lot of money in rectification if it does

just hope the room the boiler in doesn’t flood had that once took two new boiler out :D
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So it can go on to a waste pipe with over appliances on the run?

correct
 
No they shouldn't and even if it did the tundish will just overflow through the sides and expel the water but wastes do block, in fact on a number of our oil condensing pipes we would drill holes in top of external run so if a waste was to block it wouldn't flood the burner, it's a lot of money in rectification if it does

Just using a bit of common sense, there has to be a un restricted drain/vent, (ie into a tundish) from the PRV otherwise a pressure relief valve which I prefer to call a safety valve can become a pressure reducing valve in the event of blockage of the drain which can result in catastrophic rupture, tundish overflowing/flooding or whatever are meaningless really in this context.
 

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