I have an EPH Controller and 2 wired thermostats (battery powered) in 2 zones (upstairs/downstairs).
I wish to make these thermostats smart and NEST is my prefered option.
I have added the wiring image of the current thermostats which are both battery powered, so i assume only wired in to turn on and off the wired controller.
Both thermostats are only using brown wires and there are blue wires within the box currently unused.
the only wiring info i can see is (in image) COM and NO.
I am not sure if i can use nest in this case or not?
