Rheem RTG-53X Installation Instructions Download Page 3

Rough In Dimensions

 

  Height 36”; Width 15”; Depth depends upon siding on home.

Installation

The recess box is designed to be installed with a variety of 

home exterior products for new or existing construction.  

Choose a suitable location for the water heater and 

recess box.  Follow the guidelines listed on page 2 of 

this manual, or the Use and Care Manual for the water 

heater, regarding location and clearances. Frame an 

opening in the exterior wall of the home for the rough 

in dimensions in Figure 3. Local building codes and 

standard building practices should be followed.

1.

Install the recess box into the opening. Level and 

square the box.  Test fit the outer door to make 

sure it does not bind during installation. Secure 

the recess box to the framing on each side using 

four or more self tapping screws (not provided).   

Mount the water heater into the recess box. In the back 

of the recess box is a channel to support the bottom 

mounting bracket of the water heater. At the top is a 

retaining stud for securing the top mounting bracket. 

Lift the water heater up and slide the bottom mounting 

bracket down into the channel. While holding the water 

heater in place, secure the top of the unit to the retain-

ing stud with the washer and nut provided.

 

Plumbing and Piping

 

- See Figure 5 for Pipe Locations.

Follow all instructions in the Use and Care Manual for instal-

lation of gas and water lines. Holes are provided in the bot-

tom of the recess box for all piping and wiring. These holes 

line up with the fittings on the bottom of the water heater. 

 

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. 

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.

Power Disconnect

 - Install a suitable means to discon-

nect power from the unit for service. This disconnect should 

be weather resistant and meet any and all local codes. In the 

absence of local codes, the National Electrical Code should 

be followed. Refer to the Use and Care Manual for instruc-

tions in connecting the power to the water heater.  

2.

3.

1.

2.

3.

A

B

C

D

E

F

Dimensions - 

Figure 3

Dim.* Inches

A

35

(89 cm)

B

14 3/4

(37 cm)

C

5 5/8

(14 cm)

D

1

(2.5 cm)

E

37 3/4

(96 cm)

F

18 3/4

(48 cm)

* Approximate

Cripple Stud

King Stud

Trimmer Stud

Blocking

Header

Wall Stud

Sill

Typical Framing - 

Figure 4

Hot Water 

Line

Thermostat 

Wiring  

Opening

Electrical 

Opening

Relief Valve Drain

Gas Line

Cold Water 

Line

3

Plumbing and Piping Openings - 

Figure 5

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