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Water Heater Leaking: The First 10 Minutes
Shut off the water feeding the tank first, then the power or gas, the cold-water shutoff is on the pipe entering the top of the heater. A leaking tank won't fix itself, but ten calm minutes can be the difference between a mop-up and a flooded basement floor.
Do this first
The first minutes, in order
- Turn the cold-water inlet valve on top of the tank clockwise until it stops. If it's stuck or broken, close your home's main water shutoff instead.
- Electric heater: switch off its breaker at the panel. Gas heater: turn the gas control dial on the tank to OFF.
- Move belongings away and towel up standing water, water heaters live in basements and utility closets where a slow leak spreads fast.
- Find where the water is coming from: a drip at a pipe fitting or the relief valve is often repairable; water seeping from the tank body itself means the tank has failed.
- If the leak is soaking the floor near your furnace or air handler, shut the water off first, then keep water away from the HVAC equipment and its electrical connections.
Safety first
- Don't work around standing water that's touching electrical cords, outlets, or equipment, kill power to the area at the breaker first.
- Hot-water burns are real: water straight from the tank can scald. Let things cool before handling fittings.
- If a gas water heater's pilot area is wet or you smell gas, stop, leave the gas to the professionals and follow the gas-smell steps.
Stop troubleshooting and call when…
- Water is seeping from the tank body itself, the tank has failed and it only gets worse under pressure.
- You can't get the water shut off, or the shutoff valve is seized.
- Water is reaching your furnace, air handler, or electrical equipment.
- The relief valve (the pipe on the side) keeps discharging hot water, that's a pressure or temperature problem, not a nuisance.
When you call Swiss Air
What we'll actually do
- Swiss Air provides active plumbing and water-heater service in O'Fallon and the St. Louis metro, including urgent help for a leaking water heater.
- Our local plumbing team will find where the water is escaping and explain whether a valve or connection can be repaired or the tank has failed.
- We service and replace tank and tankless water heaters within the plumbing services Swiss Air is legally authorized to perform.
- Before approved work starts, we explain the options and price up front under our No Price Change Guarantee.
Quick answers
Frequently asked
- Is a leaking water heater an emergency?
- Treat it as one until the water is off. A drip at a fitting is a today-problem; water from the tank body is a failed tank under pressure that only goes one direction. Either way, the shutoff steps above stop the damage while you arrange the repair.
- Can a leaking tank be repaired, or does it have to be replaced?
- It depends where the water comes from. Fittings, the drain valve, and the temperature-and-pressure relief valve can often be repaired. The tank body itself can't, once the steel tank rusts through, replacement is the honest answer.
- Does Swiss Air repair water heaters?
- Yes. Swiss Air provides plumbing and water-heater service in the O'Fallon and St. Louis area, including repair and replacement for tank and tankless water heaters. We perform only the plumbing services we are legally authorized to provide.
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