Bleeding a hot water system is used to remove which substance?

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Multiple Choice

Bleeding a hot water system is used to remove which substance?

Explanation:
Removing trapped air from a hot water system is the purpose of bleeding. Air in pipes and radiators blocks water flow, causing cold spots and noisy, inefficient operation. Opening the bleed valve lets the air escape and, once a steady stream of water (without air) comes out, you close the valve. So the substance being removed is air. Water isn’t the target of this process, and sediment would require flushing or draining. Bubbles reflect air in the system, which bleeding specifically addresses.

Removing trapped air from a hot water system is the purpose of bleeding. Air in pipes and radiators blocks water flow, causing cold spots and noisy, inefficient operation. Opening the bleed valve lets the air escape and, once a steady stream of water (without air) comes out, you close the valve. So the substance being removed is air. Water isn’t the target of this process, and sediment would require flushing or draining. Bubbles reflect air in the system, which bleeding specifically addresses.

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