Just a note on the copper wrapped around a hotwater tank boa idea. The tanks are usually glass lined and heat transfer is painfully bad that way. I built a small test one and it was hopeless. If you like the idea I'd recommend ditching the hotwater tank and just getting a stainless tank then wrapping that. It would be far more efficient. Having said that I don't have serious space limitations at my new house and am taking the box of water approach.
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