Help please if you can. My old hot water cylinder had sprung a leak and was replaced with a new insulated one. The plumber threw away the old cylinder stat and has not replaced it with a new one. The only temp control is now from the Potterton boiler which i keep on no 1 and thermostatic radiator valves fitted onto each radiator. Therefore do i need a cylinder stat and if so which make do i buy and how /were do i take the electrical connection to.? I do have in the airing cupboard a potterton PWB1 electrical connection box situated beside the new cylinder. Thanks for your help John p.s the boiler is a Potterton netaheat 10/16 i think.