How do I shut things off safely?
Close the cold-water valve on top of the tank, then switch off the heater at the breaker if it is electric, or set the gas control to off if it is gas. If water reaches the panel or the heater's wiring, stay out and call. Never reach into water near live wiring.
The valve is usually a round wheel or a lever on the pipe entering the top of the tank. Turning it stops new water from refilling the tank, but the tank can still drain onto the floor.
If the heater is gas, do not light anything or use switches if you smell gas. Leave, call the gas utility from outside and tell the crew.
Should I replace or repair the heater?
A leaking tank cannot be repaired and must be replaced. A leaking valve, connector or drain fitting can sometimes be fixed, but if the tank is old, replacement is often the better choice. A plumber makes that call. In Prince George's County, plumbers working on water service are expected to be registered with WSSC Water.
Ask the plumber about a drain pan with a pipe to a floor drain, an expansion tank where one is needed, and a relief valve piped safely to the floor. These cost little compared with the water damage they prevent.
Ask for the plumber's credentials in writing before work begins.
How far can heater water spread?
Farther than the puddle suggests. Water runs under baseboards, into wall cavities and through floor gaps, and carpet pad wicks it across a room. A tank can release most of its contents quickly, and on a finished basement floor that can reach several rooms. The crew maps the wet area with meters before deciding where to dry.
Fifty gallons spread across a concrete floor covers a surprisingly large area, and where the floor is carpeted the pad acts as a sponge. A quick extraction is the best reducer of damage.
Items stored on the floor near the heater, such as cardboard boxes, take up water first. Lift them to dry ground when it is safe.
Is hot water more dangerous?
Briefly. Water straight from a tank can scald, and steam can fill a small room, so keep clear until the leak has stopped and cooled. After that it is clean water, which is the best case. Left for a day or two in carpet or drywall it can turn into Category 2, so extraction and drying should not wait.
Warm moisture in a closed basement raises humidity quickly and encourages mold if it is left. The crew runs dehumidifiers early.
If a person was splashed, cool the skin with running water and seek medical advice for anything beyond a mild flush.
What can I do to avoid a repeat?
Replace an aging tank before it fails, keep a drain pan under it piped to a floor drain, check the relief valve discharge line, know where the shut-off is, and keep stored boxes off the floor around it. A small leak sensor on the floor costs little and gives an early alert. A plumber can set up the rest.
Sediment builds up in tanks and the metal corrodes over years, so a flush and an inspection by a plumber extend the life of a heater that is still sound. An anode rod, which a plumber can check, is meant to corrode in place of the tank walls.
Heaters in finished spaces are the riskiest. If yours sits in a closet beside carpet or in a room with a finished ceiling below it, a drain pan is worth the small cost.
