The Marey GA5MILITAR Outdoor Propane Gas Tankless Water Heater can provide up to 1.5 gal. per minute for a perfect outdoor shower at 115F output water temperature. It is the only in the market with a camouflage cover. It is also called water heater on demand, because it heats water only when needed, saving energy. Its compact design and light weight makes easy to carry anywhere. You will only need 2-D cell battery for the ignition and it is naturally vented outdoors. Marey has been in the water heating business since 1955, bringing tradition and innovation together.