Thanks!
This is a thermostat for "anykind" of use, 12V. no internal battery, but i understand why RV's and campingtrailers use to have mechanical thermostat, not running on electricity, because of the voltage drop when you discharge the battery...
This thermostat has no special kind of use, but i can see the problem if battery getting low and the relay wont close..
There are a lot of thermostats out there, from AAbattery powerer to 12v, i have never seen a 24v... either battery, 12v or 220V...
I guess the mechanical is the best for this purpose...