Z-Wave Thermostat for Two Wire Boiler

I have a NTI TI-100 boiler with old school mechanical thermostats. The NTI boiler can’t deliver 24v to a thermostat, but does have all the wires at each thermostat. I can run plug in a 24v transformer in the space where the boiler is located.

I’m looking at the GoControl thermostat.

Has anyone used this thermostat with SmartThings?
Has anyone used a 24v transformer with this thermostat?
Any other thermostat recommendations for a boiler?

Thanks all

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: