Perfect for individual use or RVing with a partner, this tankless water heater starts up with only 2 psi, providing on-demand hot water for a shower or to wash dishes. Vent-free, compact design runs off of 2 D batteries (included). Go Tankless or Go Home Say goodbye to quick, military-style showers, refilling your tank, and waiting for the hot water to recover. This revolutionary, compact design replaces your outdated tank heater while taking up half the space. Enjoy the luxury of a hot 20-minute shower or the power of steaming hot water to wash those greasy pots and pans after dinner. Unlike traditional tank heaters that require constant energy to keep your water hot, this tankless, propane-fueled water heater only uses energy when you turn on your faucet or shower, providing the ultimate efficiency at a campground or off-the-grid. The on-demand hot water has no recovery time, so you can wash dishes and then take a hot shower to unwind. It’s perfect for full-time RVers hitting the road solo or with a spouse. You can also install it at the cabin for those weekend hunting trips or in other small living spaces. Safety First This state-of-the-art technology is equipped with built-in safety measures to ensure you, your family, and your RV stay out of harm’s way. Its vent-free design has an ODS (Oxygen Depletion Safety) shutoff device that detects low levels of oxygen. Once oxygen levels drop below 18 percent, the flame extinguishes, and the fuel supply is cut off. The unit will not operate again until the living space is properly ventilated and an adequate supply of oxygen (20 percent) is introduced. When proper oxygen levels are restored, you can manually restart the unit. For further protection, the water heater has a shutoff timer that will automatically turn off the appliance after 20 minutes of use, preventing the unit from overheating while also reducing the risk of hot water scalding.