DONT use the system untill a qualified engineer fits a new header tank as your system is running dry and doing it no good at all !!
What part of Beds are you ?
I think Ill be putting the Electromax forward for the project but I need to know the actual full height with the EXP Vessel and the width as Im sure they will have to adapt the door for the cupboard it will be going in ..
On a lot of 1 pipe systems they put a isolation valve in the bit of pipe between the valves so you can shut then off a bit + you should have swept tees to the rads ... granted it aint ideal but it does work to a degree :wink: