A leaking water heater is not something you can ignore until tomorrow. Water damage spreads fast, and what starts as a small puddle can turn into warped flooring, mold growth, and thousands of dollars in repairs within hours. Whether your tank is dripping from the bottom or you have found water pooling around the base, here is exactly what to do right now to protect your home and your family.

Step 1: Turn Off the Power

Before you touch anything else, cut the power to the water heater. This is a safety issue, not a repair step.

For gas water heaters: Locate the gas valve on the supply line leading to the unit. It is usually near the bottom of the tank. Turn the valve to the "OFF" position. Do not turn any light switches on or off, and if you smell gas, leave the house immediately and call your gas company from outside.

For electric water heaters: Go to your electrical panel and flip the breaker dedicated to the water heater to the off position. Most panels have this labeled. If you are not sure which breaker it is, turn off the main breaker to be safe. Water and electricity are a dangerous combination, and you do not want to take chances.

Step 2: Shut Off the Water Supply

Look at the top of your water heater for two pipes: one cold water inlet and one hot water outlet. The cold water inlet will have a shut-off valve, which is usually a lever or a round gate valve. Turn it clockwise (gate valve) or perpendicular to the pipe (lever valve) to stop the flow of water into the tank.

If the valve is corroded, stuck, or you cannot locate it, shut off the main water supply to your home instead. The main shut-off is typically near your water meter or where the supply line enters your house. In most Las Vegas homes, you will find it in the garage, near the front of the house, or in a box near the street.

Step 3: Contain the Water

With the power and water off, focus on minimizing damage. Place towels, buckets, or a wet-dry vacuum around the base of the unit. If the leak is significant, use a garden hose connected to the tank's drain valve (near the bottom) to route water outside or into a floor drain. Open a hot water faucet somewhere in the house to relieve pressure and help the tank drain faster.

Move any boxes, stored items, or electronics away from the water heater area. In Las Vegas garages, where many water heaters are installed, people often store belongings nearby without realizing the risk.

Where Is the Leak Coming From?

Once the immediate emergency is controlled, identifying the source of the leak helps you understand whether this is a quick fix or a replacement situation.

Top of the tank. Leaks at the top usually come from loose inlet or outlet connections, a failing pressure relief valve, or corroded pipe fittings. These are often repairable and relatively inexpensive to fix.

Temperature and pressure (T&P) relief valve. This safety valve is located on the side of the tank, usually with a small pipe running down to the floor. If it is leaking, the valve may be faulty or your water pressure or temperature may be dangerously high. Do not cap or plug this valve. It exists to prevent the tank from exploding.

Drain valve at the bottom. The drain spigot near the base of the tank can develop leaks from sediment buildup or a worn washer. This is usually a straightforward repair.

Bottom of the tank itself. This is the most serious scenario. If water is seeping from the bottom of the tank's shell, the internal lining has corroded through. Las Vegas has hard water with high mineral content, and sediment buildup accelerates internal corrosion. A tank leaking from the bottom cannot be repaired and must be replaced.

Tank vs. Tankless: Different Leak Issues

Traditional tank water heaters and tankless units fail in different ways. Tank heaters are more prone to catastrophic leaks because they store 40 to 80 gallons of water at all times. Internal corrosion, sediment buildup, and anode rod depletion are the primary culprits. Most tank water heaters last 8 to 12 years in the Las Vegas area, often less because our hard water is brutal on the internal components.

Tankless water heaters do not store water, so you will not face a 50-gallon flood. However, they can still develop leaks at pipe connections, heat exchanger cracks, or from freeze damage if installed outdoors without proper protection. Tankless units also suffer from scale buildup in the heat exchanger, which requires annual flushing to prevent. If a tankless unit is leaking from the heat exchanger itself, repair costs can be high enough that replacement makes more sense, especially on older units.

When Can You Repair vs. When Do You Replace?

Repair makes sense when:

  • The leak is from a valve, fitting, or pipe connection
  • The unit is less than 6 years old
  • The tank itself shows no signs of corrosion
  • The anode rod has been maintained and can be replaced
  • Repair costs are less than 50 percent of replacement

Replacement is the better choice when:

  • The tank itself is leaking from the bottom or sides
  • The unit is more than 8 to 10 years old
  • You have had multiple repairs in recent years
  • The tank shows visible rust or heavy sediment
  • Your energy bills have been climbing due to an inefficient unit

Preventing Future Leaks

Las Vegas water is among the hardest in the country, which means your water heater works harder and wears out faster than in cities with softer water. To extend the life of your water heater and prevent surprise leaks:

  • Flush the tank annually to remove sediment buildup from the bottom
  • Inspect the anode rod every two to three years and replace it when it is worn down
  • Check the T&P valve once a year by lifting the lever briefly to ensure it operates freely
  • Install a drip pan under the unit if it is located inside the home or above living space
  • Consider a water softener to reduce mineral deposits that accelerate corrosion

A leaking water heater feels like an emergency, and in many cases it is. But by acting quickly to shut off power and water, containing the damage, and calling a licensed professional, you can prevent a bad situation from becoming much worse. If your water heater is showing signs of age or you want to get ahead of potential problems, reach out for a free estimate and let us take a look before the next leak catches you off guard.