The average life span of a water heater depends on geographic location. In the eastern United States, water heaters can last up to 17 years. In the West, where water is more acidic and corrodes vital parts, the appliances can last as few as five years. Water heater safety is an issue. Normal water temperature ranges are 110 degrees to 140 degrees, but can reach much higher temperatures.
Most units display a warning against scalding.
Homeowners can control temperatures by turning down thermostats. Too many homeowners take water heater placement for granted. The appliances often are crammed into small spaces or crowded storage rooms with poor ventilation. Water heaters need an unobstructed supply of fresh air. Chemicals such as bleach or solvents stored nearby that are not sealed will corrode the water heater and shorten the life span.