Tengchang 8L LPG Propane Gas Hot Water Heater Tankless Boiler Instant for Bath House w/Shower High efficient energy saving : the heater exchanger and main burner adopt mostly advanced energy-saving and combustion technology to decrease gas consumption and burning noise. Low water-pressured startup : the water control linkage valve makes the heater start up under low water pressure and shortage areas and those living in high stairs. Manifold auto protection : for the sake of your safety. Ion flame inspection : to automatically shut down gas power under unexpected flameout. Over water pressure protection function : to automatically decrease pressure under excessive high water pressure. Controller design : both cold water and warm water can be properly controlled. Magnificent thin-shaped appearance : it is designed by modern fashionable line shape.