What is the location of the water heater in the lavatory?

The water heater in the lavatory is typically located under the sink with an on/off switch. This placement is strategic, as it allows for easy access to the heating mechanism and the controls necessary for operation. Positioning the heater under the sink ensures that it can efficiently provide hot water directly to the faucet for washing hands or other hygiene needs, which is essential for passenger comfort and cleanliness.

This location also minimizes the chances of inconvenience or leakage affecting other components in the lavatory or the aircraft's structure. Having the on/off switch in this area allows crew members to quickly manage the water temperature or turn off the heater if needed.

Other possible locations, such as beside the toilet, above the mirror, or in the rear compartment, do not provide the same level of accessibility or utility for hot water usage, making the under-sink location the best choice for functionality and safety.