Why is my water heater making noise?

That loud banging you’re hearing from the water heater is almost always sediment buildup inside the tank. Over time, minerals settle at the bottom and harden. When the heater fires up, water gets trapped under that layer, turns to steam, and forces its way through—causing those banging or popping sounds. It’s not usually dangerous right away, but it is a sign the heater is under stress. If left like that, it can overheat the tank, reduce efficiency, and shorten its lifespan. What I recommend: Have the tank flushed to remove sediment Check the safety (pressure relief) valve If the unit is older (around 10+ years), start considering replacement If the noise has been getting louder or you’ve never serviced the tank, it’s best to get it looked at sooner rather than later. Let me know the age and type of your heater and I can advise you further.