For many years, there has been a practice in the field of hydronics of taking a code-compliant, dual-use, tank-style water heater and using it for both domestic hot water (DHW) and space heating by circulating the hot water through radiant floor heating circuits. From the outset, as a master plumber charged with protecting the health of the nation, I have been opposed to this design. And quite frankly, I, along with other well-known industry experts, have gone before code development bodies ...

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