i am fitting a new shower for ensuite,i have a 900/400 hot cylinder which will be supplied by cistern in loft just for this,no other outlets im hoping i'll have enough head so no need for pump,just wanted to know if i had to have 50 gallon tank or would 40 do,i may have to fit shower pump if pressure isnt good enough is a 1 bar pump ok as i dont want to drain hwc to fast,.the shower only has to be functional not bothered about great pressure as long as it works
