By PlumberDallas.com editorialUpdated
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Common causes

Sediment buildup

Water trapped under sediment boils and pops.

Element scale (electric)

Hissing or sizzling.

Relief valve discharge

Hissing from the valve needs attention.

What you can check yourself

  • Flush the tank according to the manual.
  • Check the relief valve line for water.

When to call a plumber

Call if noise continues after flushing, or the relief valve discharges.

How a plumber diagnoses it

A plumber flushes, checks the anode and elements, and tests the relief valve.

What it may cost

See the water heater replacement cost guide for published price ranges and cost factors.

Ready for a professional diagnosis? Learn about water heater repair in Dallas and request help.