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

A condensing hot-water boiler reaches its highest efficiency when return-water temperature is low enough to do what?

Keep the heat exchanger dry at all times. Convert the appliance to Category I natural-draft venting. Boil the return water into low-pressure steam. Condense water vapor out of the flue gas and recover latent heat.

Correct Answer:

Condense water vapor out of the flue gas and recover latent heat.

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