How to Turn Off a Water Heater in an Apartment
On this page (5 sections)
The Short Answer: If your apartment water heater is leaking, first close the cold-water valve on the pipe into the top of the tank. Then turn off the energy: the water heater breaker for an electric unit, or the gas control knob to OFF for a gas unit. Only do this if you can reach the heater without standing in water. Then report it to your landlord right away.
Step 1: Stop the water
The cold-water supply enters the top of the tank. Look for a valve on that pipe, often labeled “cold” or marked with a blue handle.
- Lever (ball) valve: turn the handle a quarter turn so it sits across the pipe.
- Round handle (gate valve): turn it clockwise until it stops. Old gate valves can be stiff; don’t force one that won’t move.
A valve on the hot pipe won’t stop a tank leak, because water keeps coming in through the cold side. If you can’t find or turn the heater’s valve, use your apartment’s main water shutoff if you have one, or call building maintenance’s emergency number.
Step 2: Turn off the energy
Electric heater: find the breaker labeled for the water heater in your apartment’s panel. It’s usually a double breaker (two handles joined together). Switch it off. If the panel is in a wet area, don’t touch it; tell maintenance.
Gas heater: turn the knob on the gas control at the front of the tank to OFF. You can also close the gas valve on the pipe leading to the heater by turning the handle so it sits across the pipe. Don’t loosen any gas fittings.
If the heater is in a locked mechanical room or a closet you can’t access, skip this and call maintenance.
Step 3: Report it and document
- Call or message your landlord or building maintenance right away, using the emergency line if it’s after hours.
- Take photos of the leak, the area around it, and any damage to floors or walls.
- If water may have reached a unit below, tell management so they can check.
- Keep a record of when you reported it.
Repairs, relighting, and restoring power belong to the building’s maintenance staff or their plumber. If the heater isn’t leaking but you have no hot water, see water heater not working in apartment.
What happens next
Maintenance or a plumber will find the leak source. Many leaks come from fittings or the relief valve and can be repaired; a leak from the tank itself means the heater will be replaced. See can you still use water if the water heater is leaking for using cold water while you wait.
Frequently Asked Questions
Q: Can I still use cold water after shutting off the heater? A: Usually yes. Closing the valve at the heater stops water to the tank but not to the cold pipes. If you shut off your apartment’s main valve instead, all water stops.
Q: Should I drain the water heater myself? A: No. In an apartment, leave that to maintenance. Closing the cold-water valve stops the leak from getting worse.
Q: Water is coming out of the pipe on the side of the heater. Is that a leak? A: That pipe comes from the relief valve. Water from it means the valve is releasing pressure or heat. Don’t cap it; turn the heater off as above and report it.
Manuals and supporting references
These links distinguish general safety information from model-specific documentation. A manual directory helps you locate your unit’s instructions; it does not establish that every model uses the same parts, codes, or test values.
- PG&E: recognizing and responding to a gas leak (opens in a new tab)Emergency actions for suspected fuel-gas leaks.
- A. O. Smith technical bulletin 51: puddles around a heater (opens in a new tab)Common water-leak sources and the distinction between fittings and a failed tank.
Editorial standards and corrections · Prepare a useful service request