I've put new ch rads in the kitchen and outbuilding. If they are running at the same time as the rest of the house, they will be wasteful and cost a lot to run. So what I ideally want is the facility to press a single button on entering the kitchen, which will open an electrical valve and allow those radiators to run for an hour before the button needs to be pressed again. (I don't want a timer where you set it to turn on and off at specific times)
Is there any such thing as a timer like this?
Tony