From: Rheem Water Heaters
Rheem delivers a continuous flow of hot water without the wait, boasting a maximum of 11 gpm and a Uniform Energy Factor up to 0.94 with its High Efficiency Tankless Gas Water Heater with Built-in Recirculation. Because of its built-in pump, the tankless water heater is easier to install and has ½-in. gas line compatibility. The company offers a 12-year warranty on all its tankless heat exchangers.