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I checked this out based on one of those discussion threads as well ... I was told it wasn't practical here.
We have a 2,800 sf home, with four bathrooms (one in the basement) ... sometimes we run out of hot water (50 gal tank, as I recall). Tankless vendor / plumber said that to serve this home, they would have to install a larger gas line to the tankless heater, and the natural gas bill would kill us. This was a guy who apparently sold a lot of these.
Surprised me, but I dropped the research at that point.
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