The answer to 'water heater frozen' is that a frozen water heater is a common issue that can be caused by a power outage, a thermostat malfunction, or extremely cold temperatures. Symptoms include no hot water, water dripping from the unit, or the tank feeling cold to the touch. Solutions may include thawing the unit, adjusting the thermostat, or insulating the tank and pipes.
In many cases, a frozen water heater can be resolved with some DIY troubleshooting and basic repairs. However, if the issue persists or you're unsure of the cause, it's best to call a professional plumber to diagnose and fix the problem properly. Attempting complex repairs on your own could lead to further damage or safety issues.