When inspecting a solar water heating system with potable water connections, which device is required to prevent backflow of heat transfer fluid into the potable water supply?

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AFlow meter
BCheck valve
CBalancing valve
DBackflow prevention device

✓ Correct answer: D. Backflow prevention device A backflow prevention device is required by plumbing codes to prevent non-potable heat transfer fluid from contaminating the potable water supply in case of a pressure difference that could cause reverse flow.

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When inspecting a solar water heating system with potable water connections, which device is required to prevent backflow of heat transfer fluid into the potable water supply?

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