One of the most prevalent causes of indoor flooding is water heater overflows.
Water can damage your home in many ways. Most of the time it's an external threat, but sometimes a leak from inside can cause just as much, or even more, damage.
For example, a leak in the water heater in the Union County, Pa., Government Center unleashed 2,000 gallons of water in early July; this affected about 12,000 square feet of the building, and the estimated repair cost totaled $100,000.
Must have been a massive water heater, right? Not really. All of the damage was caused by a leak in a 30-gallon water heater, smaller than many of the ones found in residences.