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Dishwasher Water Supply Requirements

Installed Dishwasher

Before you run your dishwasher, make sure the water supply meets the requirements for water temperature, pressure, and hardware. Read on to learn all the requirements for your dishwasher's water supply.

To avoid severe scalding, the temperature should not exceed 149 degrees Fahrenheit.

Water Temperature

A hot water supply of 120 - 149 degrees Fahrenheit is required for the best cleaning and drying performance.

Water Pressure

The water supply pressure must be between 20 and 120 psi (pounds per square inch). 

Water pressure less than 20 psi will cause water supply valve failure and prevent the water supply valve from shutting off.


A 90-degree elbow (not included) is required to connect the water line to the dishwasher.

The elbow is 1/2-inch NPT (National Pipe Thread Taper) on one end, and 3/8-inch compression fitting on the other end.

Supply Line

The supply line is not included with the dishwasher. Most plumbing supply stores sell water supply lines of various lengths up to 10 feet long.

A stainless steel supply line is recommended.

To reduce the risk of leaks and water damage, perform the following:


  • Make the water supply shut-off valve easily accessible.

  • Shut off the valve when the dishwasher is not going to be used for a week or longer.

  • Frequently check for leaks where the hose connects to the water supply shut-off valve.

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