AC Heat recovery for Hot Water?
We replaced our central AC about a year ago. I think it's a 2.5 or 3 ton unit (for a 1550 square foot one story home in North Carolina). I anticipate that the gas water heat will have to be replaced soon -- it's about 10 years old. When I replace it, is there some way that I can recover the heat thrown off by my AC to contribute to my hot water system? I know the technology is available. What I want to know is how do I go about figuring out if it makes sense financially to do it -- how long the pay-back, etc.?
Thanks for your guidance.