How To Install A Dishwasher

how to install a dishwasher

You want to know how to install a dishwasher?  You may think it is a major job.  I have good news.  It's not too bad, quite easy for the moderately handyperson.

The first thing to make absolutely sure of is that your new dishwasher will fit in your kitchen.  A standard dishwasher opening is 24" wide and around 34" high (standard countertop height). Dry fit the new unit before starting the dishwasher installation.

Kitchens pretty much always have standard cabinet widths so if you are wanting to install a dishwasher in a kitchen that has never had a dishwasher, you could most likely remove a 24" wide cabinet and carry on with installing a dishwasher.

If you are replacing a dishwasher, some of these steps will not apply but pay attention to the water and drain hook-up as well as the electrical connections.

Alright, let's begin installing a dishwasher. 

Step 1 - Materials you will need for how to install a dishwasher

installing dishwasher

Gather up this list of materials and then we can start.  Go ahead, I'll still be here when you get back.

Drill with hole saw (around 2 1/2 to 3")

Pliers

Screwdrivers

Adjustable wrench

Level

Teflon Tape

Shut-off Valve

"Y" adaptor drain pipe

Dishwasher Connection Kit. (Most hardware stores will have these in stock)

 - Includes 90deg brass fitting, water supply hose, 1 1/2" ABS "Y" and usually some teflon tape.

Step 2 - Under the Sink

You will need to look under the kitchen sink, is it roughed in for a dishwasher?  If it is, you can go to step 4.  If not, Step 3 for you.

Step 3 - Hot Water and a Drain

Your dishwasher will need hot water.  The easiest way to get hot water is to install a new valve under the kitchen sink.  This valve should have two outlets, one for your sink and one for the dishwasher.

The dishwasher will also need to drain.  Install the ABS "Y" adaptor under your sink as well.  Be sure that you install it before the trap, not after.  You do not want any sewer gases coming in through the drain line. Phew!  Who knew how to install a dishwasher would be pretty easy?

Step 4 - Water Supply for installing a dishwasher

how to install a dishwasher



Lay the dishwasher on its back, carefully.  




how to install a dishwasher



Unscrew the kick plate.  Put the screws in a place you will remember, nothing worse than loosing them - been there, done that.



installing dishwasher
installing a dishwasher



In the dishwasher installation kit you will find a small brass 90 deg fitting. 



dishwasher installation



 Wrap teflon tape around the threads and screw it in the water inlet hole on the bottom of the dishwasher.  Aim the end so the connecting hose will flow freely in the direction you so desire.



installing dishwasher



The kit will also contain a braided hose.  Attach this hose to the water supply fitting.



how to install a dishwasher


TIP - Every dishwasher has front-to-back paths for hoses and wiring.  Knowing where these are will help tremendously when learning how to install a dishwasher.



Step 5 - Draining

how to install a dishwasher

Attach the supplied drain hose to the underside of the dishwasher.  It is usually attached with a hose clamp but I have seen a spring clamp being used as well when installing a dishwasher.

Step 6 - Electrical

do it yourself dishwasher installation


Run an electrical wire to the dishwasher.  My experience on how to install a dishwasher is to use BX wire (the armour plated wire) because there is less chance of it being damaged or crushed.  Don't hook up the electricity just yet.


do it yourself dishwasher installation



With some help, slide the dishwasher into the opening. (You will need that help to manage the hoses and wires!)



how to install a dishwasher



Using the proper wire connectors, connect the wires together. Make double sure there is no power to that line!  Black to Black, White to White, Ground (bare wire) to grounding screw (or green wire).



Step 7 - Hook-up

installing dishwasher

Finish off the dishwasher plumbing.  Attach the drain tube to the sink drain and water supply line to the water pipe under the sink.  The drain hose will need a "high loop".  This is simply attaching the drain hose as high as possible under the sink so it goes up from the hole in the cabinet and back down to the drain. You are so close to installing a dishwasher, only a few more steps.

Step 8 - Attach the dishwasher

installing dishwasher

Open the dishwasher door.  Place a level under the top lip of the diswasher and adjust the legs so that the dishwasher sits level.  Screw the dishwasher to the countertop with the supplied screws.

SIDEBAR:  I did not put the high loop on my first dishwasher installation and boy did that thing stink!  I couldn't figure it out for the longest time.  The high loop keeps the hose dry and therefore, no smell.

Step 9 - Test

Turn on the water.  Nothing spraying in your face?  Great!  

Turn on the power.  No sparks?  Great!

Do a test run and check the drain hose.  No Leaks?  Great!

Step 10 - Finished

Attach the kick plate and, voila!  You are now an expert on how to install a dishwasher.


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Hey, doing it yourself is great but if you are unsure of the advice given or the methods in which to job is done, don't do it. This site is merely a collection of how some people do home improvements. There is no way we can anticipate every situation and we do our best to inform of any risks for each job. Be sure to check local building codes for proper installation and permits. 

If in doubt, hire it out.


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