NV C-1A Boilers Practice Questions - Nevada C-1A Boilers Contractor Examination Exam

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Makeup water to a closed hydronic heating boiler must be protected against backflow because otherwise which hazard exists?

Treated or stagnant heating water can be pushed into the potable supply. The chimney will reverse and spill CO into the street main. The oil burner will lose its cad-cell view. NFPA 54 will require the water line to be sized as a gas pipe.

Correct Answer:

Treated or stagnant heating water can be pushed into the potable supply.

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