The Camplux CA528 produces comfortable instant endless hot water for residential whole families use! Features PCB frequency conversion intelligent control, temperature intelligent adjustment ensures comfortable constant hot water. Features CO multiple protection ensures safety, equipped with PCB start up self-test &real-time intelligent monitoring, timely warning of potential gas fire and hydro power to ensure your family's safety. Automatically activates on water pressure between 7.0-150 PSI, maximum power output 150,000Btu/Hr. Hot water output 5.28 gallons per minute, perfect for a hot shower for whole home! The Camplux natural gas tankless water heaters are not recommened to use for elavation above 2000 feet / 600 meters.