How to Install a Dishwasher

Are you installing a dishwasher in your new house or replacing the old one? The procedures for both tasks are similar. You just have to remove the old dishwasher first if you are replacing one.

If you are installing a dishwasher for the first time in your house, the materials and tools you will need: are:

  • Supply and drain tubes
  • ”T” fitting
  • Adjustable wrench
  • Electric drill and hole cutting bit
  • Screwdrivers
  • Pliers
  • Adjustable wrench
  • Level
  • Teflon pipe tape
  • Drain pipe for dishwasher
  • Dishwasher connection kit which includes water supply line, connectors and compression couplers.

Tips in Installing a Dishwasher

  1. To replace an old dishwasher, you will not need the drilling equipment. You won’t have to bore new holes for your connections.
  2. Every new dishwasher comes with its own instruction manual. Make sure you read it for specific installation and operation guidelines.
  3. The standard size of dishwashers is 24 inches wide with a height that fits a 34 inches high standard countertop. Measure your cabinet space for fit.
  4. There are three basic connections for a dishwasher: the hot water supply line, the drain hose connecting the dishwasher to the drainpipe under the sink, and the electrical supply (usually 20 Amps and 120 Volts in the USA). Check that you have access to these three connections.
  5. Before doing any work, turn off the circuit breaker and disconnect the power. Then turn off the water supply valve which is usually located under the sink. Drain off the water from the supply pipes by opening the faucet.
  6. If you are installing a new dishwasher, drill holes at the back lower corner of the sink base cabinet for the drain hose, water supply tube, and power cord.

    Connect the drain hose to the output of the dishwasher with a small hose clamp. Attach the water supply line to the hot water input valve on the dishwasher. Then join the electrical wiring to the small junction box on the dishwasher and close the box.

  7. Slide the dishwasher into place, adjust its front feet and align it with the cabinets and countertop. Anchor the unit to the base of the counter with the screws provided.
  8. Connect the dishwasher’s drain tube to the sink drain, and the water supply tube to the water pipe under the sink. Restore water pressure and check for leaks. Install the dishwasher’s front panel. Plug in the unit and do a test run for leaks.