Yes - The 'breather' pipe at the top is open to the vessel and it's under atmospheric pressure - it acts exactly like the vent on a Open Vent HW cylinderThis is like an open vent pipe?
Nope - F&E cistern usually use ordinary waste pipe for it's overflow as it only has to deal with cold or warm water - the HW vessel's overflow may have to deal with >95deg HW in a fault condition - normal waste pipe would start to collapse at that temp if running for any length of time.Is the over flow pipe similar to that of an open vented system header tank overflow pipe then?
Thank you it goes external at the moment but is high level and just stick out. Hate following rough plumbers . Best way of making this safe?Breather appears to be a safety vent/discharge pipe, so I would suspect operates via a PRV.
Outlet from Tundish needs to be routed to a suitable discharge point, where possibly boiling water could be released, external is recommended.
Extend it to a suitable point where any potential discharge wont affect anyone/anything passing by. Ideally would say reroute internally and come through the wall at lowest possible point to reduce risk of freezing in cold weather.Best way of making this safe?
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