The MAREY GA16NGDP Indoor Natural Gas Tankless Water Heater can provide up to 4.3 Gal. per minute for a perfect shower at 115°F output water temperature. You can see your output water temperature through a digital panel, making it easy to adjust the water and gas flow to your desired output temperature. This unit is perfect to supply endless hot water for up to 3 or 4 points of use simultaneously (for a variety of residential hot-water applications). Its compact design saves space and is easy to install: you will only need 2-D cell battery for the ignition and a venting (not included in the box).