A hot water boiler will have gravity circulation within the system unless a _________ is installed

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Study for the NOCTI Plumbing Test. Prepare with flashcards and multiple choice questions, each question comes with hints and explanations. Ensure your success on the exam!

Multiple Choice

A hot water boiler will have gravity circulation within the system unless a _________ is installed

Explanation:
Gravity circulation happens when hot water rises and cold water sinks, creating a natural loop in the system when the boiler isn’t actively circulating. Installing a flow check valve in the line from the boiler provides a one-way flow path: it lets water leave the boiler when the pump is running, but blocks reverse flow due to gravity when the system would circulate on its own. This prevents unintended gravity circulation. A pump or circulator would actually cause circulation, not prevent it, and a vent just releases air without stopping the flow.

Gravity circulation happens when hot water rises and cold water sinks, creating a natural loop in the system when the boiler isn’t actively circulating. Installing a flow check valve in the line from the boiler provides a one-way flow path: it lets water leave the boiler when the pump is running, but blocks reverse flow due to gravity when the system would circulate on its own. This prevents unintended gravity circulation. A pump or circulator would actually cause circulation, not prevent it, and a vent just releases air without stopping the flow.

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