Although they’re not top rated, Rheem water heaters are still rated among the top 10 water heater brands by toptenreviews.com, including GE Appliances, AO Smith and Titan, as of 2015. The two Rheem water heaters that are included in the list are the RTE 13 and the Marathon 85-gallon models.
The RTE 13 model features a modulating heat exchanger that ensures no loss of heat during standby and reduces the use of energy. Additionally, it is easy to install on account of its compact dimensions, including a height of 10 and a width of 7 1/4 inches. The Marathon 85-gallon model is more expensive, but it includes an 85-gallon tank, temperature and pressure valves that come pre-installed, and an energy-saving kit in the form of a pipe wrap.