Do you want to know water heater leak is an emergency? It is the most frequently asked question of plumbers by concerned homeowners. A leaking water heater like any other damaged appliance can cause a slew of problems in your home, including water damage. If your water heater overflows, you'll be ankle-deep in water, which will seep into your flooring and create optimal conditions for mold and mildew growth. For detailed information, keep reading.