The Marey 16 Liter Natural Gas Tankless Water Heater with a 4.2 GPM capacity is a great whole home water heating solution perfect for cabins, stables and homes medium sized. As it does not require electricity, the device is powered by 2 D batteries. It is therefore ideal for off-grid areas or any other place where electricity is not available. This water heater can deliver a maximum of 4.2 GPM for a perfect outdoor shower at an outlet water temperature of 115 ° F. This very versatile unit is ideal for many different outdoor uses, such as washing your pet, washing your car and also for taking a large outdoor shower. It can also be installed indoors with proper ventilation, in accordance with local building and plumbing codes. The unit includes a convenient digital panel that allows you to adjust the water temperature and gas flow, this design provides hot water on demand, saving valuable resources such as energy and water. Designed to supply up to 4 simultaneous points of use, this device offers a hot water solution for a wide variety of applications. Its compact size saves space and is easy to install.