I don't think a tankless will do well in prolonged exposure to below-zero weather. I don't camp in the winter, but I've thought about it a bit, and I think the whole coach would have to be set up well for winter weather. My Reflection 150 has thinner walls and less insulation, so it is NOT set up for winter weather. As [MENTION=38571]llr2800[/MENTION] said, the newer models of the TWHs are better able to survive cold temps. But I would want the TWH's compartment to have extra insulation. And a bilge heater would be a plus, the yachting types have been dealing with cold for a long time.
My wife and I spent the majority of this winter outside Omaha, NE. We were in our previous fifth wheel, a Jayco. (can I say that here in a GD forum?
My 2-cents worth!
Thanks,
Papaz8