Rheem ECOH160X, Installation Instructions Manual, Page: 4 / 8

4
Installation
Plumbing and Piping
Follow all instructions in the Use and Care Manual
for installation of gas and water lines. Knock outs are
provided in the bottom of the recess box for all piping
and wiring. These knock outs line up with the fittings
on the bottom of the water heater.
1. Stub the water lines and gas pipe up through
the bottom of the box (See Figure 5). It is
recommended that shut off valves and unions
be installed in the piping for future service
requirements.
Connect the water lines and gas piping to the
water heater in accordance with the instructions
in the Use and Care Manual provided with the
water heater.
2. Seal the holes around the piping with a silicone
based sealant to prevent any water from leaking
into the wall behind the recess box. Insulate
pipes with foam insulation.
Typical Rough in Framing
Cripple Stud
King Stud Trimmer
Stud
Blocking
Header
Wall Stud
Sill
Rough In Dimensions
Height 47”; Width 20”; Depth depends upon siding on home.
Recess Box Dimensions
A
B
C
D
F
E
* Approximate
Dim.* Inches
Siding Lap/Brick Stucco
A 46”
(117 cm)
46”
(117 cm)
B 19 1/4
(49 cm)
19 1/4
(49 cm)
C 9 1/4”
(24 cm)
9 1/4”
(24 cm)
D 1”
(2.0 cm)
1”
(2.0 cm)
E 23 1/4”
(59 cm)
26 1/4”
(67 cm)
F 48 3/4”
(124 cm)
51 3/8”
(131 cm)
Hot Water
Line
Electrical/
Thermostat
Wiring
Openings
Condensate
Drain line
Relief Valve Drain
(Alternate)
Gas Line
Cold Water
Line
Plumbing and Piping Knock Outs
Relief Valve
Drain