My water heater is making popping noises. Is it going to explode?

Concerns & risks

Your water heater sounds like popcorn in a kettle when it heats up. Pops, rumbles, crackles. You're wondering whether it's about to launch through the roof.

Noise usually means efficiency loss and the tank working harder than it should.

Causes & evidence

Minerals settle at the bottom of the tank; water trapped under them boils and pops. More on water heater sediment.

What to do

1. Turn the heater to 'vacation' or off (gas) / switch off the breaker (electric).
2. Attach a garden hose to the drain valve at the bottom and run it outside.
3. Open the valve and let water run until it comes out clear. Careful, it's hot.
4. Close the valve, refill the tank fully, then turn heat back on.

Common mistakes: The common mistake is ignoring the sound for years until efficiency drops. Flushing per the manufacturer's manual helps. When flushing, the water is hot, so let it cool or be very careful. Don't block the temperature and pressure relief valve or cap its pipe. If the valve leaks or the tank leaks, call a professional.

Speed Man tip: Leaking from the bottom, rusty water or a dripping relief valve? Call a plumber; those aren't sediment issues.

Wrap-up: Popping = sediment boiling at the bottom of the tank. Flushing the tank usually quiets it. Leaks or a dripping relief valve need a plumber.