Installing A New Dishwasher - Appliances - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Appliances


Thread Tools Display Modes
Old 03-14-2009, 07:37 PM   #1
Join Date: Mar 2009
Posts: 1
Rewards Points: 10

installing a new dishwasher

I am installing a new dishwasher, and at the angle stop it is a 1/4 Inch outlet. I was thinking of putting a 1/4" x 3/8 coupling then run a 3/8 line to the dishwasher. Basically, I was wondering if the pressure would still be ok (~2 inch area near angle stop that is 1/4" line). From angle stop down through floor is 1/2 " CPVC. Under the house is 3/4 " line and 1" going to the pressure tank. Any input would be helpful. Thanks.


pez372 is offline   Reply With Quote
Old 03-15-2009, 09:21 AM   #2
Long-Time DIYer
Mike Swearingen's Avatar
Join Date: Mar 2005
Location: On Albemarle Sound In Northeastern NC
Posts: 1,460
Rewards Points: 500

I'm not a pro plumber, just an old DIYer.
Is that angle stop off of the hot or cold supply? If it's off of the cold side, it may be meant only for a refrigerator water/icemaker line.
A dw should be off of the hot side only. Since I believe that those dw supply lines are 3/8", I can't see why you can't do what you're thinking as long as it's off of the hot side. The pressure should be fine.
Good Luck!


Mike Swearingen is offline   Reply With Quote
Old 03-15-2009, 04:13 PM   #3
Licensed Contractor
Join Date: Jun 2008
Location: New England, SE Conn
Posts: 78
Rewards Points: 75

As the line will terminate in an open system (Dishwasher basin) pressure is not really the concern; but flow will be. It's possible that the smaller cross-sectional area of the 1/4" pipe will cause a 'choke flow', limiting the water flowrate, causing a longer time to fill the basin/tub. Other than that, it shouldn't be a problem. If the duration to fill is too long for you, you would have to shut the water off upstream of the stop valve and upgrade to a 3/8" valve.
And the dishwasher supply should be off the hot supply, unless your dishwasher has preheat capabilities, which would be required for every load, and will extend cycle time. Not really recommended.
Good luck.
Renovator,LLC is offline   Reply With Quote
Old 03-23-2009, 08:52 AM   #4
Join Date: Jul 2008
Location: phila.
Posts: 504
Rewards Points: 500

the minimum h/w supply line is 3/8 COPPER off 1/2 line. if you use flex line you have to go up a size. if you don't you'll have washabilty problems.
Jacques is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Dishwasher installation Andy Griffith General DIY Discussions 3 03-02-2009 06:06 AM
installing built in dishwasher as stand alone dumbcluck Kitchen & Bath Remodeling 8 12-15-2008 02:23 PM
Installing a 24 in. Dishwasher in 28 in. Cabinet. coreprat Appliances 3 02-19-2008 11:48 PM
Dishwasher placement jkrodger Remodeling 2 08-03-2007 02:32 PM
Poratable Dishwasher help oiram Appliances 4 02-09-2007 04:28 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1