Had a similar situation with a few older buildings I maintain. Swapping to low-flow toilets definitely cut down on water bills, but I’ve seen more callbacks for clogs and “mystery” overflows since then. In my experience, the issue’s usually worse if the plumbing’s original—those old cast iron pipes just don’t handle the lower volume as well. Sometimes you get buildup that wouldn’t be a problem with more water moving through.
I always recommend checking the main lines before making the switch, especially in older places. A camera inspection can save a lot of headaches down the line. Also, not all low-flows are created equal—some of the cheaper models just don’t have enough force. If you’re going to invest, it’s worth spending a bit more for something with a decent flush rating. Water savings are great, but not if you’re dealing with backups or leaks every few months... That’s a safety risk and a hassle for everyone.
I get where you’re coming from, but I think there’s a bit more to the story with low-flow toilets and old plumbing. You mentioned:
Sometimes you get buildup that wouldn’t be a problem with more water moving through.
Here’s the thing—I’ve got a 1920s house with original pipes, and I was nervous about switching too. But after some research (and a few chats with plumbers), I tried a different approach:
1. Went for a pressure-assisted low-flow model instead of gravity-fed. It cost more, but the flush is way stronger—haven’t had a single clog in two years.
2. Started using thinner, recycled toilet paper. Sounds silly, but it breaks down faster and doesn’t gum up the works.
3. Every few months, I run a bucket of hot water down the toilet just to keep things moving.
Honestly, I think the key is matching the right toilet to your plumbing and being willing to tweak habits a bit. Not every old system is doomed to clog with low-flow—sometimes it just takes a little trial and error (and yeah, maybe skipping the bargain-bin toilets).
Sounds silly, but it breaks down faster and doesn’t gum up the works.
Pressure-assisted models really do make a difference. I was skeptical at first, but after dealing with constant clogs in my old place, I finally bit the bullet and upgraded. Haven’t looked back. The hot water trick is new to me though—might have to give that a shot next time things slow down.
Honestly, I’ve seen pressure-assist models work great, but they’re not always a magic fix. Some of the older ones are loud as heck and can be a pain if you need parts. I’ve had decent luck with newer gravity toilets—if you get a good brand and don’t cheap out, they’re not as bad as people say. Hot water trick’s interesting, but I’d be careful with that... too much heat can mess with seals over time.
Hot water trick’s interesting, but I’d be careful with that... too much heat can mess with seals over time.
That’s spot on—seen a few wax rings go soft from folks pouring boiling water down there. For gravity toilets, I usually recommend sticking with models that have a decent flush valve and trapway design. Out of curiosity, has anyone tried the dual-flush types? I’ve had mixed results depending on the brand.