Wouldn't I have to take those footings down to the frostline?
We are having a wood stove installed and I have a portable gas powered generator that can run a Rinnai heater that has its own tank.
Yes...we're in sand here and I auger down about 42" to 48 inches if I recall correctly. I have an auger on my skid steer though so it only takes me about 2 minutes to punch 4 holes. I don't bother with footings (concrete pads or sonotube) for something like that. Its not really a permanent thing. You said its only about 400 pounds. It doesn't take much for that.