Why does my hot water sometimes sound like popcorn?

That’s pretty much been my experience too - sometimes you just need the tank to limp along until you can budget for a replacement. I’ve tried the powered flush kits once, and honestly, it wasn’t as messy as I expected, but it didn’t do much for the baked-in sediment either. At a certain point, you’re right, it’s just about squeezing out a few more months. Not ideal, but sometimes that’s all you can do when money’s tight.

I get what you mean about just trying to make it last. I’ve seen tanks where the sediment is so caked on, even a powered flush barely makes a dent. Did you ever try pulling the anode rod to check if it was completely gone? Sometimes that’s the real culprit for those weird noises, not just the sediment.

Pulled out an anode rod once that looked like a pencil stub - barely anything left. Tank was making all sorts of racket, like popcorn and knocking. Replaced the rod, noise dropped off a bit, but honestly, if the sediment’s baked in, sometimes it’s just too late. Those old tanks can be stubborn.

Yeah, I’ve had that popcorn sound too, especially after years of not draining the tank. Makes me wonder - does flushing actually get rid of all the sediment, or just the loose stuff? I replaced my anode rod last year and it helped a bit, but there’s still some noise now and then. Is it possible the heating element gets buried in gunk and that’s what causes the popping? Or is it just old age for these tanks? Sometimes I think no amount of maintenance can save ‘em once they’re past a certain point.

I get what you’re saying about maintenance only going so far, but I’ve actually seen some tanks last way longer than expected just from regular flushing. The sediment doesn’t always come out all at once, but if you do it every year, it really does help keep the heating element from getting buried. That popcorn noise is usually steam bubbles trapped under the gunk - sometimes a good flush can quiet things down, even on older tanks. I wouldn’t write them off too soon… some of these old beasts are tougher than they look.