I'm hoping someone can advise on this one. I want to replace my existing timer-free immersion heater with one with a timer; I'm on Economy 7 electric, with a two cable mains input. Unfortunately the above Horstmann Electronic 7 "requires" (it says on the box) a single input. Assuming the switch from day to night rate occurs upstream, would it be sensible just to put the two mains inputs into the single set of posts? I'm guessing the two circuits are never live at the same time. The existing timer, Horstmann E7BX (God knows how old) accepts the two mains inputs. Appreciate any comments, irrespective of the tone.