A water heater rarely dies politely. It usually announces itself at 6am when someone steps into a cold shower, or at midnight when a pool of water spreads across the garage floor.
What you do in the first day matters — both for your safety and for how much the repair ends up costing. Work through this in order.
1. Decide whether this is a leak or a heating problem
These are completely different emergencies. Water on the floor means shut it down now. No hot water with a dry floor means you have time to think.
2. If it’s leaking, shut off the water supply
There’s a cold water shutoff valve on the pipe entering the top of the tank. Turn it clockwise until it stops. If that valve is seized — common on older installs — go to your main shutoff instead.
3. Cut the energy source
For electric, flip the dedicated breaker in your panel. For gas, turn the gas control dial to “OFF” — not “PILOT”. A heating element that fires in an empty or draining tank will destroy itself in minutes.
4. Check the obvious things before you call anyone
- Has the breaker tripped? Reset it once. If it trips again, stop — that’s a fault, not a nuisance.
- Is the pilot light out on a gas unit? Relight it following the label on the tank. If it won’t hold, the thermocouple is failing.
- Has someone knocked the thermostat down? It happens more than you’d think.
- Is the water lukewarm rather than cold? That usually points to one dead element in a two-element electric tank.
5. Look at where the water is actually coming from
Water from the T&P discharge pipe is a pressure or temperature problem, and it’s a safety issue. Water at a fitting is usually a fixable connection. Water seeping from the base of the tank itself is a failed tank — no repair exists for that, and you’re replacing it.
6. Move what matters
Get boxes, carpet and anything cardboard off the floor around the unit. A slow tank leak becomes a fast one without warning, and the secondary damage almost always costs more than the heater did.
7. Know when to stop
Call a licensed plumber immediately if you smell gas, if the breaker trips repeatedly, if the T&P valve is discharging steam or hot water, or if the tank is bulging or scorched. None of these are wait-until-Monday problems.
Emergency work is a large share of what we do — see our water heater leak repair page for how we handle after-hours calls here in Rochester. Readers in Southern California who’ve found this page while standing in a wet garage should look at emergency water heater repair in Covina instead — Covina Water Heater Pros run 24/7 across the San Gabriel Valley on (626) 416-2094.
8. Before the technician arrives
Clear a path to the unit and find the serial number. Age determines whether you’re having a repair conversation or a replacement conversation, and having it ready saves everyone twenty minutes.
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