A water heater pan drain must terminate how many inches above the adjacent ground surface?

The requirement for a water heater pan drain to terminate between 6 to 24 inches above the adjacent ground surface is established to ensure proper drainage and to prevent overflow or flooding situations. This height allows for adequate drainage while also minimizing the risk of obstruction or backflow from surrounding soil or debris.

By setting the termination point in this range, it helps to ensure that any water draining from the pan will effectively move away from the water heater area and not accumulate, which could lead to mold growth or structural damage.

It is essential for the drainage system to be elevated enough to allow for clear and unobstructed flow while also considering practical aspects for maintenance and emergency situations. Setting this height provides a balance between functionality and safety, fulfilling the code requirements as outlined in the IRC.