When turning off water in the lavatory, what else should you turn off?

• A. Water Heater
• B. Lavatory Light
• C. Waste Disposal
• D. Vent Fan

Answer: (A)

When you shut off the lavatory’s water, you should also isolate the hot-water supply by turning off the lavatory water heater. The heater is connected to the same potable-water system and provides hot water for the faucet. If the heater stays on while the water supply is shut or drained, it can operate without water, potentially causing overheating and damage to the heater or its electrical circuit, and it wastes power. Turning off the heater prevents this dry-running condition and keeps the system safe. The other items don’t depend on the water shutoff, so they don’t need to be turned off as part of this action.