Coleman Hot Water-On-Demand Portable Water Heater can heat 40 gallons of water on just one Coleman 16.4 ounce propane bottle and a single pump battery charge. Additional accessories that are sold separately include: a spray adapter for showering, a carry case, a water hose adapter for continuous water flow, and a bulk propane adapter. The heater works to heat water in just five seconds with a built in propane fueled burner (propane sold separately). Unlike traditional methods of heating water in the great outdoors (think tiny camp stove and two gallon pot) the heater is equipped with a built in igniter so you can turn the water on and off as you need it. http://amplify.com/u/brpbx