Tankless water heaters: casing leaks versus connection leaks

Honestly, I get where you’re coming from - hidden leaks are a nightmare for sure, but I almost feel like visible drips can be just as bad, depending on where they’re happening. Like, I had a slow drip from the shutoff valve under my bathroom sink (just a tiny little bead every few minutes), and I figured, “Okay, no big deal, I’ll get to it next weekend.” Well, next weekend turned into a small puddle, and then I realized the water had been seeping into the cabinet base the whole time. Ended up with a warped cabinet and some moldy-smelling particle board. Not quite behind drywall, but still a pain.

I guess what I’m saying is, even when you *see* the leak, it’s easy to underestimate how much damage it can do if you don’t jump on it right away. The “out of sight, out of mind” thing works both ways - sometimes I think I convince myself a small drip is less urgent just because it’s not hidden. But water always finds a way to mess things up if you give it time.

About those rubber gaskets - I’ve wondered about that too. Maybe it’s just the cheap ones that go first? Or maybe they dry out faster if you don’t use the valve much... I don’t know. I’ve started replacing them any time I touch the connections now, just in case.

Still, I totally get the paranoia about hidden stuff. I feel like I’m always poking around behind appliances or checking for soft spots on the wall. It’s exhausting, but after hearing horror stories about people having to rip up their floors, it’s hard not to be a little obsessive.

I guess what I’m saying is, even when you *see* the leak, it’s easy to underestimate how much damage it can do if you don’t jump on it right away.

Yeah, I learned that lesson the hard way with my washing machine hookup. Thought a tiny drip was “no big deal” until I noticed the baseboard swelling up. Turns out, water + particle board = instant regret. Now I keep a flashlight in the bathroom just for checking under sinks... feels a little paranoid, but after one moldy surprise, I’m not taking chances. Those gaskets are sneaky too - sometimes they look fine but are totally brittle inside.

Honestly, those tiny drips are the worst because they sneak up on you. Big leaks get your attention, but a slow drip can rot out a cabinet before you even notice. I’ve seen “just a little moisture” turn into a full-on science experiment under a sink. Gaskets are like ninjas - quiet until it’s too late. Always worth checking, even if you feel a bit overcautious.

I get what you’re saying about slow drips - they’re sneaky. But I’ve had more headaches from leaks at the connections, especially when tenants don’t notice until there’s water pooling everywhere. Do you think it’s easier to miss a slow drip or a loose fitting?

Honestly, I’ve seen both cause a mess, but those slow drips are like ninjas - quiet, steady, and they’ll rot out a cabinet before anyone notices. Loose fittings, though, can go from nothing to Niagara Falls if they finally give way. If I had to pick, I’d say slow drips are easier to miss, especially under sinks where nobody looks until it smells musty or the wood’s warped. Had a tenant once who thought the “weird stain” was just from mopping... turns out it was a year’s worth of drip-drip-drip.