[trit21]

This was not my project so I am only going on what my friend told me. I asked the same question, did you upgrade the wiring and he told me the InstaHot he purchased required 10AWG and the original wiring in place for the original tank was 10AWG. If my hot water tank was to break I would look into this a viable alternative but would not replace my tank with one of these just to do it. Living in FL, the water is already warmed so a much smaller INstahot is needed but we will see how they work in the winter, I would think not very well but that is to be seen.