We have a solar heating system for our pool and it does work very well. Have had it over 2yrs now and did have one leak at a connection which was fixed for free. That has been our only problem. Cost for our system was just under $4K and when I did a return on investment analysis our break-even came back as 4 to 5yrs.
On the other hand we did look into a whole house solar system and that price was close to $50K with a return of about 20yrs. Since those estimates were back in 2008 I suspect the cost might be lower now.
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