What is the maximum height that a washing machine drain may be installed above finished floor?

The maximum height that a washing machine drain may be installed above the finished floor is established to ensure proper drainage and prevent issues like siphoning or backflow. For most residential plumbing codes, including those that refer to washing machine installations, the height limit is typically set at 54 inches. This height allows for sufficient drainage of the washing machine while accommodating the necessary slope of the drain line to ensure that wastewater flows properly into the drainage system.

Installing the drain too high can risk creating problems with the washing machine's ability to pump out water efficiently. Heights above this limit may cause the machine to struggle against gravity when discharging water, potentially leading to appliance malfunctions or improper drainage. Therefore, choosing 54 inches as the maximum height is crucial for maintaining effective performance and compliance with plumbing standards.