How to shut off a leaking water heater

A leaking tank keeps filling until the cold inlet is closed. The valve is usually on the copper or PEX line above the heater, not on the hot outlet.

Turn that valve clockwise until it stops. If it will not move, do not force a seized handle with pliers while you are standing in water. Call us and we will shut it down on the leaking water heater visit.

Electric heaters need the breaker open next. Gas heaters need the appliance gas valve off only if you can see the lever and you are not in standing water. If you smell gas, leave and call the gas utility from outside. The NFPA home fire safety guidance is the reason we do not treat a gas smell as a DIY step.

After the inlet is closed, the tank can still hold hot water. It will not keep pouring new water onto the slab.

A drain pan under the tank catches a slow drip. It does not stop one. If the pan has a drain line, follow that line. On many Gifford and Wabasso houses it ends outside a foundation wall. Water there means the pan is doing its job and the tank is still leaking.

Emptying the pan with a shop vac is fine once the inlet is closed. Emptying it while the inlet is open just makes room for the next gallon.

Read the overflowing pan guide if the pan is already over the lip. A rust hole at the base is past a shutoff story. That pattern is the bottom leak guide.

Once the inlet is closed, people want to flip the breaker back and see if the drip was a fluke. Do not. A tank that leaked under pressure will leak again when it heats and expands. Leave the breaker off, or the gas valve off, until we have looked at the shell.

Open a hot faucet on the first floor for a few seconds if the inlet is already closed. That takes a little pressure off the tank. It will not empty the tank onto the floor, and it should not. A full drain through the hose bib is our job if we need the tank empty. A hose in a garage with no floor drain just moves the flood.

Take a photo of the top of the heater and of the wet spot. We use it to confirm fuel and to see whether the relief pipe is the thing dripping. Photos do not replace the visit. They stop us from bringing a gas part to an electric closet.

If the house main is the valve you closed, the kitchen will be dry too. Tell us that on the phone so we know the heater valve failed open. We will not hunt a handle you already bypassed.

Wet drywall in the hall can stay. Poking it with a screwdriver makes a bigger hole and does not find the leak. The leak is at the heater. The wall is only the path. We will say if the closet needs a pan, a new valve, or a new tank after the steel is in front of us.

We look at the shell, the nipples, the drain valve, and the relief line. A fitting leak can be a repair. A rust hole is a replacement.

You hear the price before any wrench turns. If the floor is already flooded, the first job is a safe shutdown, not a sales pitch.

Tell us what you already closed. Inlet only, breaker only, or the house main. That sentence saves a lap around the garage. If a hose is already on the drain valve, leave the valve shut. An open drain with the inlet still open is a second flood.

We carry the common inlet valves and dielectric fittings because Vero Beach closets mix copper, PEX, and old galvanized nipples. Salt film on an island fitting is not the same as a split tank. We will show you the threads before we call it a shell failure.

After the work, we open the inlet slowly and watch the same spot you watched. A repair that still drips is not finished. A new tank gets the same watch, including the relief pipe, so we do not leave you with a different leak.

If you cannot find a valve, you have still helped by keeping people off the wet floor and by leaving the breaker alone when the panel is wet. That is a complete first step. We take the shutdown from there.