Z-Wave Thermostat for Two Wire Boiler

[RBoy (www.rboyapps.com - Making SmartThings Easy!)]

You can use the Venstar Add a wire solution to convert a 2 wire to 3 wire 24v without having to run the entire wire:

[RELEASE] Enhanced Z-Wave Plus Thermostat Device Handler - Honeywell, GoControl, CT, Linear, Trane, MCO, Remotec

You may want to check our a Venstar system which can add an extra C wire to exiting setup without a running a new wire. FYR, the IRIS Smart Plug doesn’t act like a reliable z-wave repeater even though it’s capable, rather it is also know to cause issues with the zwave mesh as reported by other folks on the forum.