If you are changing the header tank then you need to drain down. Bunging won't help you. However if you turn off cold mains and run hot tap you Will empty the header and not the cylinder allowing you to add an extra 25gall tank or replace with 50gall tank. The Bunging would allow you to remove the hot water coupling from the cylinder to fit a flange without draining. Hope this makes sense bit im drunk right now......
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Yes it does cheers KJ (Hooray - i am finally being able to understand most of what's been posted ! Must be geting better.
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Here's my plan:
I need to move the header tank first, so will turn off rising main, isolate tank on cw feed valve & drain off the CH by the stopcock on the rad nearest the door & out. Re-position. Give it a good clean out & re-fill.
Then drain the cold existing water (CWSC?) tank (opening all the hot taps to drain). Add ano 25gallon CWSC with x2 22mm link pipes (better than 1x 28mm apparently) and run 22mm pipe out of the far end of the new tank direct to the pump.
I have run cold & hot pipes out of the pump, back up to the loft, down the the mixer valve, back up & across & to the shower (overhead drench).
I just then need to decide on the best way to get the hot water in to the pump (Warix / S etc.)
When i do that I think i get your instructions KJ thanks: i.e. "bung" the header, open the taps & use some towels when fitting the flange.
By the way, can you fit an iso valve on the header tank 'out' to the cylinder (instead of bunging it)?
Mine currently has no isolation on the out - so could fit when move it - or is it bad practise / not the done thing?