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Old 08-18-2011, 05:57 PM   #1
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Dishwasher water supply line too small?


I recently had a GE dishwasher installed by a plumber and afterwards was reading the installation instructions. In the instruction manual it says not to use a water supply line that is smaller than 3/8". The plumber used 1/4"; now i am concerned that there is going to be a problem. Does anyone know if using a smaller water line is going to cause problems with the durability, function or performance of the dishwasher?

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Old 08-18-2011, 06:04 PM   #2
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Dishwasher water supply line too small?


It is possible that the dishwasher won't fill fast enough for proper washing action. Use a clock or watch with a second hand and listen as a cycle goes through. Write down the length of time water is entering, length of time washing action is going on, and length of time the water is drained out. Typically it needs 5 minutes for washing and 2 minutes for rinsing. Usually there are two wash cycles followed by two or three rinse cycles.

If fill time is more than half of the combined fill plus wash time then you probably ahve a too slow fill problem.

Check the dishes for films or residues at the end of the cycle.

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Old 08-18-2011, 07:17 PM   #3
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Dishwasher water supply line too small?


Take a picture of that please-----I can't imagine a plumber using 1/4" line--I must see that to believe it.----Mike---
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Old 08-18-2011, 08:54 PM   #4
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Dishwasher water supply line too small?


maybe plumbing standards are different between the US and Canada? When I went to Home Depot to purchase a 90 degree dishwasher supply line connection they were all 3/8" to 1/4" connections - which would imply to me that using 1/4" for water supply is fairly standard.
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Old 08-18-2011, 09:00 PM   #5
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Dishwasher water supply line too small?


Sorry--all I've ever seen are 1/2"x3/8" or 1/2" x1/2"----Must be something new---
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Old 08-18-2011, 10:07 PM   #6
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Dishwasher water supply line too small?


All the dishwashers I've seen have a floating water level sensor. It shouldn't matter how long it takes, it will reach the fill level eventually.
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Old 08-18-2011, 11:17 PM   #7
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Dishwasher water supply line too small?


Quote:
maybe plumbing standards are different between the US and Canada?
Nope. Our market is much too small to differ from our US cousins.

Big box = junk. There's a MUCH better selection and variety at plumbing supply houses.
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Old 08-18-2011, 11:17 PM   #8
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Dishwasher water supply line too small?


readar - that makes perfect sense, but I wonder why GE would stipulate no smaller than 3/8"
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Old 08-18-2011, 11:19 PM   #9
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Dishwasher water supply line too small?


VIPlumber - fair enough, I just wonder why the plumber would have run 1/4", unless it was a norm.
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Old 08-19-2011, 08:10 AM   #10
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Dishwasher water supply line too small?


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Originally Posted by VIPlumber View Post
Nope. Our market is much too small to differ from our US cousins.

Big box = junk. There's a MUCH better selection and variety at plumbing supply houses.
Not everybody has access to Plumbing Supply House and besides that they treat you like your from MARS when your not in the trade and have an account there. I know been in the business over 40 YRS.
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Old 09-07-2011, 09:34 AM   #11
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Dishwasher water supply line too small?


some dishwashers use a valve that let the 'correct' amount of water in regardless of the pressure (as long as it is over a certain pressure). if yours says to use a certain diameter hose, maybe its valve needs that size to get to that minimum pressure, and therefore allow the 'correct' volume. But i would think this minimum is pretty low.

correct is in quotations because there is variation. the smaller the valves variation rating the better the valve.

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