Gas Fitter Practice Test

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In a hydronic heating system, what is the purpose of a backflow preventer?

Keep hot water from entering the cold water system
Hold the pressure on the system during temporary shutdowns
Prevent the heating water from circulating the wrong way
Keep non-combustible water from entering the drinking water system

The correct answer is: Keep non-combustible water from entering the drinking water system

The function of a backflow preventer in a hydronic heating system is primarily to prevent the contamination of the drinking water supply. By preventing non-combustible water or any other potential contaminants from the heating system from entering the potable water system, it ensures that the drinking water remains safe for consumption. This is crucial because if contaminated water were to flow backward into the supply lines, it could pose significant health risks. In addition, while some options may touch on related concepts such as pressure maintenance, proper flow direction, or temperature separation, they do not directly address the core purpose of a backflow preventer, which is to maintain the integrity of the drinking water system by preventing any form of cross-contamination. This critical safety function is regulated by plumbing codes and standards to ensure safe and healthy water sources for all users.