Why does a water heater leak cause so much damage for so little water?
The water spreads under the flooring and into the wall cavity behind the unit, where it is out of sight. A small volume can wet a large area of framing and subfloor, and that is where the drying has to reach.
Water runs along the top of a subfloor and under the flooring until it finds a low spot or a gap. A heater that drips for a few hours can wet the floor under the closet and the wall behind it, and the water can keep moving for some time after the drip has stopped.
The lower wall behind a water heater is often the most damaged part, because the water is held against it by the tank and the drain pan. The crew reads that wall and the floor together, and it does not treat the puddle as the full extent of the loss.
Should the water heater be repaired or replaced after a leak?
That is a plumber's decision, not the restoration crew's. The plumber checks the tank, the fittings and the valves, and gives a recommendation. The restoration crew dries the area and writes down the findings that affect the decision.
A leak from a fitting may be repaired. A leak from the tank itself usually means the unit has to be replaced, because a tank cannot be patched reliably once it has failed at its base.
Ask the plumber for the scope of the repair or replacement in writing, and keep it with the restoration scope. The two sets of records show what failed, what was done and where the water went.
What moves the price of water heater leak damage?
The price follows the volume of water, how far it spread, how much flooring and wall has to come out, and whether the unit is still in place during the drying. No figure is given on this site. The scope is explained and approved on site before any flooring is removed.
The area of the wet floor and the depth of the wall damage matter most. A closet floor with a few sheets of flooring and a short wall section is a smaller job than a laundry room with wet cabinet bases and a stripped baseboard.
A unit that has to be moved for the drying, or for the plumber, adds time and handling. The crew notes the position of the heater and any connections before anything is moved, so the work can be planned around it.
Can I leave the heater running while the floor dries?
No, not if it has leaked. Shut off the power for an electric unit and the supply to the heater before the drying starts, and leave the gas unit to a qualified person. A running heater that is leaking adds water and creates a shock or fire hazard.
Once the unit is shut off and the water is stopped, the crew can dry the space around it. The unit is not turned back on until a plumber has checked it, and the gas connections, if any, have been checked by the appropriate person.
If the heater has been running with a small leak, tell the operator on the phone. The crew can plan the first visit around the shut-off and the electrical and gas checks.
What should I do with the water that is still on the floor?
Clear away anything that can be moved safely, keep the area clear of foot traffic and the power off, and do not wade through the water to reach the heater. The crew takes the standing water out and reads the floor under it.
Use towels only to slow the water at the edge, and do not use a household wet vac near the heater while it is still connected. Lift small items off the floor and onto dry surfaces, and photograph the area before it is changed.
Keep a note of the time the leak was noticed, the approximate amount of water and where it went. That record is useful for the claim and for the plumber.
