Outdoor Mounted Water Heater Fire Catching Ways: Electricity pulse automatic fire catching Discharge Ways: Flue automatic gas discharge Applicable water pressure :Zero pressure starting Water & gas combination unit ,Fitted with over heating and pressure safeguard Suitable for both summer and winter Mains power not required Electrical requirement: DC3V, Automatic electric ignition powered by two (2) size 'D' batteries (batteries not included); No electrical hook up; No standing pilot Description: 1. 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. 2. 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. 3. Manifold auto protection : for the sake of your safety¡¡ 4. Ion flame inspection : to automatically shut down gas power under unexpected flameout. 5. Over water pressure protection function : to automatically decrease pressure under excessive high water pressure. 6. Controller design : both cold water and warm water can be properly controlled 7. Magnificent thin-shaped appearance : it is designed by modern fashionable line shape. there has a power button under the item, please turn it on and also need to confirm if the place has enough the water pressure and gas pressure before using. Tips: In a cold weather, we suggest letting the water out of the unit after finishing use the product. Otherwise, the cold temperature may cause residual water in the heater to freeze and crack the tank.Install water pipe to water heater need Teflon tape to avoid leaking.