I was installing a dishwasher for a friend of mine this evening and while looking through the directions it made no mention of a high loop. An air gap diagram was present but it said only required by AHJ or local codes.
According to WHirlpool there is no need for a high loop…
If the IRC applies in your area a high loop is required.
My understanding is that with most dishwashers if you dont have the required high loop (or required air gap for places still on UPC based codes) on the discharge/waste line, the sink can back up into the dishwasher … :shock:
P.S. In addition, the supply line needs to be protected by an air gap or backflow preventer, which is usually built into dishwashers. Perhaps the mfr meant an air gap on the supply isnt needed.
How long does it take to install a clamp and anchor the flexible drain line beneath the counter? Maybe 2 minutes… maybe less? Sure is a helluva lot less time and effort than gets invested in determining whether it’s required or recommended…
My opinion… who cares whether the jurisdiction requires it or not… just do it!
I posted a while back about the loop, because I have been seeing New homes without the loop, seems like the same models with integral back flow preventer. spoke to a plumber who claimed he had been installing without a loop for a while .
Just curious what models have a built in air-gap on the discharge, becuase I havent come across that yet. Many have built-in protection on the supply side, but not on the discharge side. Are those special models for areas still on UPC codes (like CA) that require an air gap instead of a high loop on the discharge?
That talks about a built in loop (not a high loop) … which is also not a built in “air-gap”.
Did you mean they have a “loop” built in? Thats different than an “air gap”. I am aware of built-in side loops and water supply protection, but I am not aware of any that have a built-in “air gap” on the discharge side.