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Can't believe I'm going where no man has gone before, i.e., the first to post on this forum. Anyhow, what is the most efficient way to produce DHW? I thought that tankless was the way to go, until I installed one in my home. Aside from having to have sufficient flow, you'll always get that "cold sandwich" effect in between showers. Is there a better way? Also, is there a way to recapture any of the heat that goes down the drain along with the hot water?