Savor the pleasure of endless hot water for bathing, cooking, dishes, laundry, and all the other countless ways hot water enriches your life. The RL75e lets you enjoy continuous hot water for up to five plumbing and appliance outlets simultaneously always at a consistent, pre-set temperature. With a capacity of up to 7.5 gallons of hot water per minute (GPM), the RL75e still delivers up to 40% energy savings and significant space savings. This compact, exterior-mount unit vents directly to the outside with no venting system. Natural gas or propane.