Currently have a motorised valve run off a room and cylinder thermostats to control water flow to heating & or hot water. When both supplied no water flows to downstairs radiators - when hot tank up to temperature (which can take 1.5hrs !!) and valve goes to heating only, the downstairs...
I haven't even bought it yet, but I meant something like the Mira Event rather than an electric shower with a KW rating, or a separate pump for an existing shower. A self contained unit with a integral pump. Sorry i wasn't clear.
Basically I read somewhere they should be supplied by direct...