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I had a great experience with a tankless heater in my stick house. It supplied all my domestic hot water and it heated the entire house in western Mass, not a warm place in winter. My unit was 180,000 BTU and it could supply endless hot water at 7 G.P.M. with input temp of 45 degrees. Mine supplied 160 degree water which was then mixed down to 130 for DHW and less for my radiant heat.
Be careful what you hear from U.S. plumbing suppliers. They don't like to sell or service stuff outside their comfort zone. This technology is huge in Japan and Europe and is only now getting a foothold here. Many places sell 'tankless' intended for an under counter, single appliance setting. This is NOT the only way to get tankless. Unfortunately people buy these little things and then put them to use in unintended ways. Then they spend the next decade peeing on the technology.
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