Only Marathon (by Rheem) offers the one thing you're looking for in a water heater. KEM Electric carries the 50-gallon Marathon water heater. It features an all polybutene tank that is guaranteed not to leak, rust or corrode for as long as you own your home. It also is one of the most efficient water heaters on the market. To learn more please visit https://www.rheem.com/innovations/innovation_residential/marathon/
