Microvoltage switch

I am trying to find a battery powered switch to control a micro voltage switch for a fireplace. Any suggestions?

I would be very interested by the same product, as they are no z-wave thermostat available in europe. With a microvoltage switch (basically just closing a wire conection), I could build a custom thermostat for my heating system.

there should be an easier way than with a wall light plug right?