The situation

Illustrative example. Not a real job or customer.

Early one morning a homeowner opens the garage and finds an inch of water across the floor. Cardboard boxes along the wall are soaked. The gas water heater in the corner is dripping steadily from underneath, and there is no gas smell.

  1. They close the cold water valve on top of the heater.
  2. They turn the gas control knob on the heater to off.
  3. They open the garage door, move boxes outside and sweep water to the driveway.
  4. They let the tank cool before thinking about draining it.
  5. They photograph the heater, label and damaged boxes.

A licensed plumber confirms the tank has corroded through at the bottom. A replacement is installed with seismic strapping and the permit question is checked with the city.

Decisions along the way

  • IfIs there a gas smell?ThenNo, so it is safe to shut the unit down. If there had been, they would leave and call 911 or SoCalGas from outside.
  • IfIs the leak from a fitting or the tank?ThenFrom under the tank, which points to a failed tank rather than a repair.
  • IfSame-day replacement or wait?ThenWith the water off to the heater, the rest of the house has cold water, so they compare written prices before choosing.
  • IfTank or tankless?ThenThey stay with a tank to avoid gas line and venting changes on short notice, and note tankless for a future project.

Why tanks fail this way

Hard water leaves sediment in the bottom of the tank, which can contribute to corrosion at the base. Garages hide slow drips, so many tank failures are found only once water is spreading.

The example family's heater sat directly on the floor with boxes stacked close by. A drain pan, keeping storage away from the heater and a yearly look at the base would have shown rust earlier.

What the replacement covered

  • Seismic strapping, as California requires for water heaters.
  • Relief valve and discharge pipe properly routed.
  • Gas connection and venting checked.
  • Permit question confirmed with the city.
  • Old unit hauled away.

Questions they asked

  1. Is the existing strapping suitable for the new unit?
  2. Do we need an expansion tank?
  3. Would a drain pan help in this garage?
  4. How often should we flush the new tank with our hard water?

Common questions

Is this example based on a real job?

No. It is hypothetical and written to explain a common failure.

Can a corroded tank be repaired?

A tank that has rusted through is generally replaced, not repaired.

Did they need to drain the tank?

It is often drained before removal, after it cools. The plumber typically handles that during replacement.

General information for Anaheim, not a quote or professional advice. In an emergency, call 911.