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Hi good to be back for tips and advice from the forum,having done a few jobs since completing my c and g course i have not yet come accross working with indirect system,everyone i been to had combi"s and the work has been easy, i know what i about to ask is easy to you guys here but i am just making sure before i do the work,simple washbasin and toilet installation like for like,but having not come accross this type of common house-hold system i just need a little help,i pretty sure i dont have to drain all the cylinder of water to change the hot water taps,my question is about which valves to turn off,am i right in saying turn off the gate valve for the hot water which is located near to the vessel then run the hot water tap till it stops running,also do i have have to turn off the iso valve located in the attic or does that not matter,also do i need to tie up ball cock in loft for cold water draining to change the cw taps and wc,or should i just turn off the gate valve/iso valve located under the cistern.......i know its sounds amatuerish but i never touched this system and to be honest college just showed us how to plumb in a vessel,lol. cheers guys any info appreciated.......