Dishwashers are connected to your home’s plumbing system. As such, when you need a new dishwasher, you will have to connect it to your home’s plumbing system.
Here is a comprehensive guide on how to plumb a dishwasher.
Page Contents (Click Icon To Open/Close)
A Dishwashers Mechanical Connections
Considerations When Plumbing a Dishwasher
Types of dishwashers
The tools You'll Need
How to Easily Plumb Your Dishwasher
Plumbing a regular dishwasher & drain
- 1First, connect the drain hose in the back of the dishwasher into the drain hose next to the air gap.
- 2Next, connect the larger side of the air gap to the sink drain and make sure that it is connected to the main drain pipe.
- 3Next, attach hose clamps to both ends of the tailpieces. Make sure that there are no kinks in the drain pipe. If the hose is too long, you can cut it and reattach the clamps.
- 4Run the dishwasher without any dishes in it to make sure that there are no leaks.
- 5If there is a leak, check the dishwasher hose for any holes and make sure the clamps are fully attached.
Plumbing a kitchen sink with disposal and dishwasher
- 1First, make sure you cut off the water supply to your kitchens completely before doing anything. Unplug the garbage disposal power cord or turn of the power supply.
- 2Use a screwdriver to slowly pry the knockout plug out of the hose nozzle and remove the plug with some pliers.
- 3Attach the air gap fitting to the proper hole and rotate the nozzles until one is pointing to the garbage disposal.
- 4Next, attach one side of the garbage disposal hose to the dishwasher and tighten it with a clamp.
- 5Next, using a knife, cut the hose so that it is a good length and attach it to the open nozzle to the air gap.
- 6Attach a final hose clamp to the hose over the air gap fitting and make sure there are no kinks in the hose.
Plumbing in a dishwasher & washing machine together
- 1First, turn off the main water shut-off valve next to your water meter. Unplug the washing machine and disconnect the cold and hot water lines.
- 2Next, cut the top 6 inches off the hot water pipeline. Clean the edges and attach the tee splitter fitting. Coat the pipes with soldering paste around the joint. Solder the joints until it is shiny.
- 3Attach the powerline to your dishwasher. If it is a plug, just plug it into the wall or hardwired the power supply to the power connectors.
- 4Next, attach the water feed line to the dishwasher and attach it with a compression nut.
- 5Then, reconnect the washing machine to the water lines and plug it back in. Push the washing machine back into the wall.
- 6Depending on where your dishwasher is, attach it to your cabinet setup.
- 7Once everything is connected, turn the water supply back on and check the system for leaks.
Plumbing a table top dishwasher
- 1First, find the place you want to place the dishwasher on the counter and clear the space. Try to pick a spot that is close to the main sink and has at least 18 inches of clearance below the upper cabinets.
- 2Remove the sink aerator and replace it with the one that came with the tabletop dishwasher. Connect the adaptor to the faucet with pliers.
- 3Then, connect your dishwasher to the main water supply. The straight end of the inlet hose should go into the dishwasher. Tighten both ends with a pair of pliers.
- 4Attach one end of the included drainage hose to the drainage standpipe or the sink. Connect the other end to the back of the dishwasher.
- 5Turn off the water faucet and check the hose for any leaks—test both hot and cold water.
- 6Next, plug the dishwasher into an outlet and give it a test run without any dishes. Make sure that those drainage hoses do not leak.
How Much Does It Cost to Plumb a Dishwasher?
It depends on the scale of the renovations that you need. If the dishwasher hookups are already installed in the house, then it will not take much work to get things set up and running. If you have a full-sized standalone dishwasher, you could potentially install it yourself without any professional help for very cheap.
A DIY installation of a fully integrated dishwasher might be hard unless you have remodeling experience in kitchens.
Professional installation for a dishwasher will probably cost around $50-$150 if the hookups are already there. On the other hand, if the hookups are not already in place, then professional installation could cost anywhere between $300-$500, depending on how much remodeling needs to happen.
Ultimately, the right choice is up to you. We would not recommend doing a DIY installation unless you have some prior experience with home projects and installations.
Get a free quote below from a local plumber in your area.
DIY Vs Professional Installation
People also Ask (FAQs)
Can you plumb a dishwasher away from the sink?
Yes, most dishwashers come with a 6’ supply line that you can connect to the main drain and water lines of your sink. You can also buy a hose extension if you need more space.
Can I connect the dishwasher directly to the waste pipe?
You can do this, and there are no code violations for doing so. However, you will need to make sure you have the right fitting with a u-bend trap to keep sewer gases from backing up into your kitchen.
Also, if the waste line is not far enough below the dishwasher, wastewater could back up into the machine and your kitchen.
How long does it take to DIY install a dishwasher?
It depends on your experience level with DIY home projects, but it can take anywhere between 2-4 hours, assuming you do not run into any serious problems with installation.
Are most dishwashers plugged in or hardwired?
Most dishwashers are hardwired, though a not insignificant minority use regular 120-volt plugs. If your dishwasher uses a plug, then you will need a nearby outlet under the cabinets.
Dishwashers are a great appliance that can save you time and water. However, you need to make sure that it is installed properly, or you could cause water and waste damage in your kitchen. So make sure that you have a full understanding of the layout and setup you will need to install things.
Ian Haynes is an expert writer who has successfully deployed over 500 plumbing pages and other related content. He has an excellent understanding of home plumbing issues and translates his experiences via Plumbing Lab so readers can have a better understanding of common household problems. Outside of his work, Ian likes exploring Brooklyn with his Labrador.