The average lifespan of a Rheem water heater depends on type, with tank water heaters lasting 10 to 15 years and tankless water heaters lasting 20 years or more, which is standard for industry and competitive with other brands. Rheem Manufacturing Company, founded in 1925, headquartered in Atlanta, Georgia, makes Rheem water heaters including gas tank, electric tank, and tankless models. Rheem gas tank water heaters, costing $500 to $1200, average 10 to 12 years with proper maintenance like annual flushing to remove sediment, anode rod replacement every 3 to 5 years, and temperature set at 120 degrees. Rheem electric tank water heaters, costing $400 to $1000, average 10 to 15 years, slightly longer than gas because less corrosion. Rheem tankless water heaters, costing $1000 to $3000, average 20 years or more, up to 25 years, because they do not store water and have less corrosion, with heat exchangers lasting longer. Factors that shorten lifespan include hard water without softener, high temperature setting over 140 degrees, lack of flushing, and high usage. Rheem offers warranties of 6 years standard and 9 to 12 years for premium models, with extended warranties available. So average lifespan is 10 to 12 years for Rheem gas tank, 10 to 15 for electric tank, and 20 plus years for tankless, with maintenance extending life.
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