International Residential Code (IRC) Plumbing Practice Test

Placing the water heater on a flat surface is crucial for ensuring proper leveling during installation. This helps avoid issues such as uneven heating, water pooling, or potential damage to the unit. A flat surface provides a stable foundation, preventing the heater from tipping or becoming misaligned, which can lead to operational inefficiencies or safety hazards.

While adjusting the base and securing with bolts can assist in stability, the primary requirement is to ensure that the base is inherently level from the start. Installing with a gradient is typically not advisable for water heaters, as they need to maintain a level position to function correctly and safely. Therefore, starting with a flat surface is foundational to a successful installation.