Propane tankless water heaters provide comfort, versatility, convenience, and efficiency by supplying high volumes of hot water on demand, eliminating standby energy losses that occur in storage tank systems. They can also be wall-mounted to free up more livable space in the same building footprint. They’re compact in size but not in performance, with an average flow rate of about 222 gallons/hour—more than three times higher than a standard 50-gallon electric storage tank water heater’s delivery of 62 gallons in the first hour.