Why does a water heater leak cause so much damage?
The heater usually sits on a floor that water can reach quickly, and the leak runs along the floor and under cabinets and walls before it is seen. Wood and subfloor beneath the floor covering stay wet long after the surface looks dry.
Tanks are often in cellars and closets where the floor is concrete or wood and the wall base is not finished. Water runs along the lowest point and soaks into the bottom of the wall, the sill plate and any stored items that touch the floor.
The heater is also near other equipment, including the electrical panel and the gas lines, so the leak can reach places where it is more hazardous. The crew checks those areas before anything is started near them.
Is a water heater leak clean water or contaminated water?
Water from a water heater is usually clean at the start, but it can pick up debris and sediment from the tank and from the floor as it spreads. The water is treated as clean at first and reassessed if it has reached other materials or drains.
Hot water from the tank can carry sediment and rust, which stain surfaces and can leave residue on the floor. The water can also pick up dirt and debris as it moves across a cellar or a utility room. The crew notes what it finds and checks the water before deciding on the drying plan.
If the leak has reached a drain, a floor drain or a sewer connection, the water may be treated differently, and the technician will explain the change before any work begins.
Can I shut the heater off myself before the crew arrives?
Yes, if it is safe to do so. Turn off the cold-water supply valve and the power to the unit, from a dry place if possible. Do not touch a wet electrical control, and do not relight a gas unit that has been under water.
For an electric heater, turn off the breaker that feeds the unit. For a gas heater, set the gas control to pilot or off, and do not attempt to relight the pilot if the unit has been under water. A gas unit that has been flooded should be checked by a plumber before it is used.
If the heater is in a cellar with standing water, do not enter until the power to that area has been turned off at the panel from a dry place. If you cannot do this safely, leave the area and call for help.
How long does a water heater area take to dry?
The time depends on how far the water reached and what materials it touched. A small area of floor may dry in a few days, while wood framing, the subfloor and the wall base can take longer. The readings show when the area reaches its targets.
The area around the tank is usually dried with equipment placed to reach the floor and the wall base. Cabinets and stored items are removed and dried or discarded, depending on their condition. The readings show the progress and guide the decision to remove the equipment.
The drying can be delayed by a replacement heater that must be installed in the same place. The crew can time its work with the plumber's schedule, so the new unit is not installed over wet materials.
What should I check on my heater to prevent another leak?
Look at the tank's base, the connections, the drain valve and the drain pan at least once a year, and note any new staining or dampness. A plumber can inspect the heater, the expansion tank and the pressure relief valve, and can advise on replacement.
A water heater has a limited life, and a tank that is old or showing rust at the base should be assessed by a plumber. The age of the heater is often on its label, and the plumber can tell you whether replacement is the better option.
Keep the area around the heater clear, and place a drip pan or a flood sensor where water would collect. A sensor can alert you to a leak while the house is empty, which can prevent a larger loss.
