We researched the subject of waterless hot water before building our home in TV. According to info we found it appears that it would take several years to recoup your investment in tankless design. The info also said that it takes just as long for tankless to deliver hot water as it does for a traditional HW heater. I just never found a large amount of info in support of it although it does sound like a good idea. We finally went with a traditional HW system.
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