The answer to 'water heater rusty water' is that rusty water from a water heater is usually caused by the corrosion of the water heater's internal components, such as the anode rod or tank lining. This can happen over time as the water heater ages, and it's a common problem that homeowners may encounter.
Some common symptoms of a rusty water heater include reddish or brownish water coming from the taps, a metallic taste in the water, and a buildup of sediment in the bottom of the tank. If left unaddressed, a rusty water heater can lead to more serious issues like leaks, reduced efficiency, and even a complete tank failure.