la. Wrap with Teflon: Both ends of a %' straight nipple {not included). 2. Screw one end of the nipple into the back of the heater. 4. Turn faucet on and allow the water run for 10 seconds, then attach the shower head. CONGRATULATIONS INSTALLATION IS NOW COMPLETE| Cree the faucet (s muted on, hot water will come out instantly Set the temperature by HOW TO INSTALL YOUR SHOWER HEATER 1b. Wrap with Teflon: The threads on the heater output. 3. Screw the heater onto the pipe, holding the heater cover firmly.