It's been along time since I've lived up in yer neck of the country. And I'm not and expert when it comes to solar stuff, but you don't necessarily have to have direct sunlight for a solar heater to work. Granted it won't heat water all the time, but the idea is to reduce energy costs.
If you only have, say 100 days a year of non rain days, you should cut your water heating costs buy maybe 20%.
On the other side, I knew a guy several years ago that had a propane water heater just for his shower, and only used the pilot flame to heat it. He claimed it worked just fine.
Then there is the plumber_bob idea that would use a small cement lined furnace, (probably smaller than a 5 gallon bucket), powered by free used oil, to heat the water.
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