Red Seal Plumbing Practice Exam

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What device can be installed to protect a hot water boiler from low water level?

  1. Probe type cut off

  2. Diaphragm tank

  3. Flow switch

  4. Pressure reducing valve

The correct answer is: Probe type cut off

Installing a probe type cut off is the most effective way to protect a hot water boiler from low water level. A diaphragm tank would be used for pressure regulation, not water level protection. A flow switch monitors the flow rate, not the water level. And a pressure reducing valve is used to regulate water pressure, not to protect against low water level.

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