Easy to Install & Use: 1. Mount the gas water heater on the wall with the provided installation kits.. 2. Connect shower hose to the hot water outlet. 3. Connect water hose to the water inlet. 4. Connect gas regulator to the gas cylinder. 5. Check carefully gas leaking by spraying soap solutions on the connections. 6. Insert 2 “D” size batteries. (not included) 7. Open gas valve and switch on the shower head, water flows, water heater turns on automatically, hot water comes out instantly. MULTIPLE APPLICATIONS