Shutting down a leaking tank

  1. Close the cold water supply

    The valve usually sits on the cold pipe entering the top of the heater. If it won't turn or leaks itself, close the house's main shutoff, often where the water line enters the basement near the meter.

  2. Turn off the energy source

    On a gas unit, turn the control knob to off or pilot. On an electric unit, flip its breaker at the panel, but only from a dry spot.

  3. Relieve the tank

    Opening a hot-water faucet upstairs lowers the pressure. Draining what's left through the drain valve into a floor drain limits the spill, but skip it if the valve or hose route is under water.

  4. Document before you move anything

    Take wide photos of the floor, the heater, its label and the area around it. The data plate shows the tank's age, which an adjuster may ask about.

Why mid-century basements spread the water

Many Aurora ranches from the 1950s and 1960s keep the water heater and furnace in a small utility area, with the rest of the basement finished later by one owner after another. Those finishes cause the trouble. Paneling and drywall run down to the floor, carpet covers the concrete and partition walls sit on wood bottom plates right on the slab. Water from a tank failure spreads under all of it and often reaches rooms that look untouched.

Floor drains in older basements are sometimes partly blocked, slow or buried under flooring. If the drain couldn't keep up, water may have pooled for hours. That longer soak shapes the outcome more than the size of the tank.

What to expect from extraction and drying

Water type
Usually clean at first, though it can pick up dirt from an unsealed floor
Carpet and pad
Carpet often gets extracted and dried. Pad commonly gets replaced
Paneling and drywall
Checked with a meter. Wet lower sections may be cut out to dry the wall cavities
Bottom plates
Wood plates on the slab hold water, and drying them is part of the job
Furnace and ductwork
If water reached the furnace base or floor ducts, have an HVAC technician inspect before restarting

Before the new heater goes in

  • Ask whether the replacement needs a permit. The City of Aurora Building Division can confirm
  • Consider a drain pan piped to the floor drain if the spot allows
  • Ask about a leak sensor with an automatic shutoff valve on the cold supply
  • Make sure the area is dry and the readings are recorded before new flooring or finishes go back near the heater
  • Keep the photo of the old tank's data plate in the claim file

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