part of the wet central heating i'm putting into my motorhome calls for a 3 way motorised valve, to be used in exactly the same way as the one in a home heating and hot water system, i.e. if the hot water tank stat wants heating, valve goes over and feeds hot water from boiler through tank coils,
if heating is wanted by the room stat, valve goes over other way, water from boiler goes around rad circuit.
And if heating and water are called for, it goes to the mid position and feeds both.
However i need one that has a 12 volt DC motor in it, i've heard they are available, but where? anyone know where i can get one from???