Good question.. Safe bet is that the appliance has an automatic shut down if propane or electrical power [ igniter ] is not available at the valve. Like most modern home appliances.
Otherwise the liability would be enormous.
Not having taken delivery of our Hawk, I have no idea of how the propane bottles are connected, nor disconnected. I was planning on a bottle gauge but that may not be needed or possible.
Devils advocate; if the WR goes to 45 degrees but the Honeywell goes to 35 degrees is that alone sufficient to change thermostats? If my intent is to prevent freezing of water in lines and fixtures my guess is that 45 degrees might do the trick but that 35 degrees might not.
I realize that propane is a limiter for extended camping off the grid; but will the Honeywell save significant propane and battery electrical?
Not adverse to changing out a new thermostat and will do so if it makes sense.
Thanks for all the input!
Phil