Rheem RTE 27 Series Use and Care Manual - Page 6

Installing the water heater. 1. Thank you for your purchase of the Electric Tankless Water Heater. This is a quick reference guide to installation. Remember you must consult a licensed electrician and plumber for guidance. 2. Remove the unit from the box before continuing. Please check to make sure all mounting hardware and instruction manuals are present. DO NOT continue until you have all these items. 3. Shut off all water supply lines to the existing water heater. (If this is a new installation, make sure the water is completely shut off.) 4. Remove the water heater to expose pipes. Locate and mark the spot where you plan to install the tankless water heater. 5. Mount unit to wall at selected location.(See Figure 1) 6. Install the water lines to the tankless water heater using supplied compression fittings. (See Figure 2.) 7. Open the main water valve and let the water run for 2 minutes through the unit to remove all air in the line. Close water tap after 2 minutes and check for leaks. 8. Check existing electrical code for appropriate wire gauge and breaker size. (This step should be done by a qualified electrician to avoid electrical problems.) 9. Once the electrical connection is complete, turn on breaker and verify the green "Stand-By" light is on. 10. Electrical connections may be completed without accessing inside components of the water heater. 11. Turn on hot water tap and check that the red "Activation" lights come on. 12. Set the temperature knob to the desired water temperature. (See Figure 3.) 6