Using Aeon Labs ZW078-A in a garage

I am looking to hook up a ZW078 in my garage for that will turn on a large space heater. I noticed after I ordered it, that it the ambient temp rating is pretty restrictive. If I have it in my garage in the winter time (avg night time temp in Jan/Feb is only 16F) will this just cause the device to fail prematurely and need to be replaced or would it be a fire hazard?

It seems the only option if this does not work is to go with the more expensive GE 12726