Gary at builditsolar.com has had some success with solar heating in the winter, though I admit his system IS large. He uses an insulated pit in the ground as his storage.
When there's no sun, its usually windy, and vice-versa, if most of the parts can be scrounged fairly cheap, why not do both for winter water heat?
I believe it may be a worthwhile investement, especially if the hot water is also used to warm the floors. Maybe not appropriate for everyone, but perhaps useful for quite a few?
"I refuse to look through this new telescope, it might confuse my ideas" -Cremonini, Galileo's professor of science from the University of Padua, 1632
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