Originally Posted by 340Cuda
I was very interested in one but found in a retrofit the cost the unit and the installation costs made them uneconomical. However my hot water heaters are inside mechanical closets inside the house.


Same here, the units I looked out required a minimum 3/4" line for natural gas and mine is 1/2" coming out of a concrete slab. Retrofit would be cost prohibitive but I like the concept.

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