thanks for your reply,i dont know what s pack means.
i thought i could change my programmer to a 3 channel one and add an extra valve to heat the water in my new tank
i have a vented ch system already and would like to add another hot water cylinder.i know i probably will have to upgrade my boiler.i am having an extension with another bathroom and i would rather fit another cylinder than make my existing cylinder bigger because of the distance between the old cyl...
