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

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A condensing boiler heat exchanger is listed for 9 feet of water pressure drop at 16 gpm. The rest of a closed primary loop (pipe, fittings, separator) is 5 feet at that flow. What head must the boiler circulator produce at 16 gpm?

5 feet, ignoring the exchanger because it is inside the boiler. 9 feet, ignoring the piping because the loop is short. 14 feet, the sum of exchanger and loop drops 30 feet, matching the relief-valve setting in feet

Correct Answer:

14 feet, the sum of exchanger and loop drops

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