Rheem RTE 3, User Manual, Page: 6 / 16

Installing the water heater.
6
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.)