Using an Airstream trailer, as originally equipped, using the furnace as designed, will protect from freezing down to about -20 degrees F. That's minus 20 degrees F.
Again, you must run the furnace, without any augmented heat source, and keep the trailer at least 60 degrees warm.
Using an electric heater or catalytic heater will actually impede the protection, as they will cause the furnace to run less, which reduces the amount of "circulated" heat.
Wrap the water hose with a heat strip.
Andy
inlandrv.com
airstreamparts.com
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