Hi I need a little advice I have a indirect heating system and have removed all of the radiators and rehung new ones and now I want to remove all the pipe work and replace in ready for a new combi but still want to keep the old boiler heating water in the cylinder until it is replaced is it correct to tie up the valve on the f&e tank then drain the water from the pipe work and then cap off the pipe work just after the motorized valve then untie the f&e valve and let it fill the loop from the boiler to the cylinder is this correct thanks in advance for any help.