Final answer:
Water heaters installed in a garage must be installed so that the lowest heating element is at least 18 inches off the ground.
Step-by-step explanation:
In the case of water heaters installed in a garage, the lowest heating element should be at least 18 inches off the ground.
This safety requirement is in place to prevent potential hazards and ensure proper ventilation.
By keeping the heating element at a sufficient height, the risk of accidentally touching or damaging the element is reduced, and it also allows for easier access during maintenance or repairs.