Google Nest Community

The Google cwire adapter wasn't working with my 2 wire system (heat only). Since there aren't any nest professionals in our area, I called a local company and they recommended using Fast stat which has worked fine. I am getting notifications daily fr...

I've got a propane boiler for heat only, my old thermostat is a Honeywell mercury dial style with a red and white. Do I need a power wire or with the existing wire work? I received a n260 code. If not how long do the batteries last? Thanks