Has anyone run into issues with local inspectors being picky about high loops versus air gaps? I’ve heard some places are starting to crack down and only accept air gaps, even if the high loop is technically up to code. Makes me wonder if it’s worth just biting the bullet and dealing with the weird look for peace of mind. Also, does anyone actually notice a difference in noise or drainage speed between the two setups? I’m always worried about water backing up if I don’t do it “by the book.”
Title: Under Sink Hookup vs. Dedicated Drain Line: Which Is Better for Dishwashers?
- Ran into this exact issue last year—inspector flagged my high loop even though it was technically code here. Ended up swapping to an air gap just to avoid the hassle.
- Honestly, air gaps do look a bit odd, but they’re bulletproof for backflow protection. Never had a call about drainage speed or noise being worse with one.
- If you’re worried about water backing up, air gap’s the safest bet. High loops work, but inspectors are getting stricter... I’d rather not risk a failed inspection and have to redo it.
I get why folks go with air gaps, especially if you’re dealing with picky inspectors or just want to play it safe. But honestly, I’ve had a high loop setup for years and never had a single issue—no weird smells, no water backing up, nothing. Maybe I just got lucky with my local code enforcement, but they were fine with it as long as it was mounted high enough under the counter.
I do get the point about air gaps being “bulletproof,” but man, I just can’t get past how awkward they look sticking out of the sink. Plus, I’ve heard from a couple neighbors that theirs have gotten clogged with gunk over time and started making this whistling noise when the dishwasher drains. Not a huge deal to clean out, but still kind of annoying.
As for dedicated drain lines, I actually helped my brother-in-law run one when he remodeled his kitchen. It’s definitely more work upfront, but it’s super clean and you don’t have to worry about sharing the sink drain at all. If you’re already tearing stuff apart, it might be worth considering. Otherwise, I’d say high loop is still a solid option if your inspector’s not too strict.
Guess it really comes down to what you’re comfortable with and how much hassle you want to deal with during install (and inspection). For me, I’ll stick with the high loop until someone tells me I can’t... but I totally get why others go the air gap route. Just wish they’d come up with a version that doesn’t look like a tiny periscope on my sink.
I totally get the air gap vs high loop debate. When we moved in last year, I was all about doing things “by the book,” but after crawling under the sink and seeing how tight everything was, I chickened out on the air gap. Ended up going with a high loop, zip-tied it as high as I could, and honestly, it’s been fine. No smells, no weird noises. My neighbor has an air gap and he’s always grumbling about cleaning it out. If I ever redo the kitchen, I might look into a dedicated drain just for peace of mind, but for now, high loop seems like the sweet spot—at least until an inspector says otherwise.
I hear you on the high loop—I've got a few rentals and that's what most tenants end up with, just because it's less hassle. Air gaps are great in theory, but man, they get gross fast if folks aren't on top of cleaning. If you ever do go for the dedicated drain, just be ready for a little more plumbing gymnastics... but hey, at least you won't have to explain to anyone why water's shooting out of a chrome cap on the sink.