I am running a very simple back boiler to a few rads with an open header tank. I want to divert the water when it gets too hot to my indirect hotwater cylinder. So I was thinking of adding a diverter valve simply wired to a thermostat so that when the temperature in the pipes gets to a certain amount it will divert the water to the tank as if it is an extra radiator. The plumbing of all this is simple and I am happy to undertake it but wiring a simple thermostat to the diverter valve is new to me. Is this a simple operation? Can you point me in the direction of a wiring diagramme to satisfy this model?
Thank you

Exactly what "diverter valve" are we talking about here? Please provide manufacturer and model #. Thanks!

It will be a 3-way motorised valve, but I haven't purchased one yet, so will get which ever you recommend.

Click on this link... should get you where you want to go:

http://www.heat-timer.com/enFiles/ProductDocument/MotorizedRadiantManual-59267A-Web.pdf

Includes design, valves and wiring diagram.

Mark