I'm about to install (with the help of an electrician) a towel warmer which will be heated in winter by the ch system, and in summer with an electrical element connected to a timer. Does it matter whether the ch (honeywell) thermostatic valve is located at the same terminal as the element on the towel warmer and/or is there any rule as to whether each item, including stop valve should be located at specific points (input or output)? I am aware that closing both input and output valves would cause pressure to build up inside the unit, so that can be managed!