What ensures backflow prevention in potable water connections to hot water boilers?

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The correct answer is the reduced pressure principle backflow prevention assembly. This device is specifically designed to prevent backflow in potable water systems, particularly in connections to hot water boilers. Its operation involves maintaining a lower pressure on the potable side of the system compared to the non-potable side, ensuring that contaminated water cannot flow back into the clean water supply.

The reduced pressure principle assembly consists of two check valves and a pressure relief valve. This configuration allows for the detection of any backpressure or back siphonage conditions, enabling the assembly to function effectively under varying pressures. Additionally, it can handle situations where water pressure may drop, thus providing comprehensive protection against any potential contamination from the boiler or other sources.

In contrast, a simple shut-off valve does not provide adequate backflow prevention, as it only stops the flow of water in one direction. A double-check valve assembly offers some level of protection but is less effective compared to the reduced pressure principle assembly in scenarios involving high risk of contamination. An expansion tank is designed for accommodating thermal expansion in a water heating system, but it does not serve to prevent backflow. Understanding these operational characteristics highlights why the reduced pressure principle backflow prevention assembly is essential for safe and compliant potable water connections.

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