mike2016 Posted March 26, 2020 Share Posted March 26, 2020 Hi, Basic question but how do I safely empty a vented hot water cylinder to allow me to insert a T piece into the main 3/4" outflow pipe at the top of the cylinder? I plan to close the feed from the cold water tank and use the hot tap in the bathroom / bath tap to drain off a few litres until the pressure drops. I could drill a small hole in the part of the pipe I'm removing to check and drain off any more using an aluminium foil "gutter" into a bucket just in case. Apart from that are there any other tips anyone has to avoid me flooding the kitchen ceiling below a third time?!! Background: I'm installing a Mira Mode gravity pumped shower unit so need to tee off the 3/4" to a 1/2" for the hot feed at a 45 degree downward angle to prevent air bubbles entering the pump. Link to comment Share on other sites More sharing options...
PeterW Posted March 26, 2020 Share Posted March 26, 2020 Should be a drain in the bottom of the tank, and you’ll need to stop the feed from the tank in the attic first. Link to comment Share on other sites More sharing options...
mike2016 Posted March 26, 2020 Author Share Posted March 26, 2020 Ahaa...spotted it - that makes sense!! How troublesome are these after 20-30 years?! Link to comment Share on other sites More sharing options...
ProDave Posted March 26, 2020 Share Posted March 26, 2020 You won't need to drain the whole tank for that. And if you REALLY mean a 3/4" pipe I hope you have already sourced the fittings, as 22mm won't fit. Link to comment Share on other sites More sharing options...
mike2016 Posted March 26, 2020 Author Share Posted March 26, 2020 Phew! Gave me sweats there.....I quoted imperial as I thought they were the same size!! It's all 15/22mm in my hot press though. That matches the solder fittings I've purchased so should be good to go..... Link to comment Share on other sites More sharing options...
ProDave Posted March 26, 2020 Share Posted March 26, 2020 22 minutes ago, mike2016 said: Phew! Gave me sweats there.....I quoted imperial as I thought they were the same size!! It's all 15/22mm in my hot press though. That matches the solder fittings I've purchased so should be good to go..... When I re plumbed my 1930's house 30 years ago, they were all 1/2" and 3/4" Then you could buy adaptors, both compression and solder to go between imperial and metric. Link to comment Share on other sites More sharing options...
dpmiller Posted March 26, 2020 Share Posted March 26, 2020 Careful... Imperial is still used in RoI Link to comment Share on other sites More sharing options...
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