Water heater · triage
Water heater popping or rumbling
The short answer
Usually “Watch”. Popping and rumbling are most often mineral sediment at the bottom of the tank, common with hard water. It is worth dealing with because sediment makes the heater work harder.
Hot water and pressureDraining a tank means handling scalding water and a valve that may not reseal. If you are unsure, leave it to a plumber.
Know your shutoffs
Every outcome on this card
WatchSediment in the tank
Not urgent. Plan a flush or a check.
- Note the heater’s age and when it was last flushed Put it in your log.
- Ask a plumber about flushing at the next service Some manufacturers recommend periodic draining; check the manual.
- If it is old and loud, start pricing a replacement Run any quote through Quote Check.
Minerals settle and trap small pockets of water that boil and pop as the burner or element heats. It wastes energy and stresses the tank over time.
TodayNoise plus a leak or relief-valve discharge
Get it checked today.
- Cut the energy to the heater Breaker off, or gas control to OFF.
- Close the cold-water valve if water is escaping
- Call a plumber Do not cap the relief pipe.
Emergency nowPossible gas or combustion problem
Leave and call from outside.
- Get everyone out
- Don't make a spark
- Call the gas utility or 911 from outside
Related
Written from
Original casaq guidance, updated 2026-10-05. General guidance, not a diagnosis; licensed-pro review pending. Severity levels: Emergency now / Today / This week / This month / Watch. Send a correction.
Step 1