What type of heat exchanger is typically required when separating potable water from toxic heat transfer fluid in a solar water heating system?

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Multiple choice — select the best answer

ADouble-wall heat exchanger with visible leak path
BSingle-wall copper heat exchanger
CPlate-type stainless steel heat exchanger
DCoaxial heat exchanger with monitoring system

✓ Correct answer: A. Double-wall heat exchanger with visible leak path Double-wall heat exchangers with a visible leak path between the walls provide an additional layer of protection against cross-contamination of potable water with toxic heat transfer fluid.

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