Rheem manufactures the most highly rated gas water heater, according to HotWater. The company also offers electric, solar and heat-pump water heaters, as well as tankless models. Other top gas water heater brands include Bosch, Whirlpool, American Residential and AO Smith.
One top-rated Rheem water heater is the 40-gallon 22V40F1, which is intended for small households. This self-cleaning model resists sediment accumulation and functions properly in high altitude locations. The Rheem 22V40F1 features reduced nitrous oxide emissions. It also has an automatic shutoff safety system and fuel vapor ignition suppression technology. This heater comes with a six-year manufacturer's warranty on all components.