I think the equation becomes a lot more difficult when you're up north and have access to other forms of energy for sure. I would have given it a second thought if mine was installed in a living space since you'd be pumping cold air into it in the winter when you're trying to keep it heated. I think I've certainly got the absolute best-case scenario for one.Interesting concept, never heard of this style of water heater before. For an old house up north would they be good to put in a basement to keep the air dried out? Not electric, gas powered.
No available gas
Not in a living space
The garage is usually a few degrees warmer than outside in the winter and HOT in the summer (southwest facing)
I don't know that it gets a lot better from a water heater point of view in that case (Other than living in the tropics), unless I wanted to do roof mount thermal solar.