Rheem RTG-53X Installation Instructions Download Page 4

Thermostat Wiring

 - A hole is provided for 

the Thermostat wire(s). Route the wire through the 

hole and connect the wire to the water heater accord-

ing to the instructions in the Use and Care Manual. 

 

Final Assembly and Inspection

 - Follow the 

Use and Care Manual for complete details about the water 

heater.  Check all water and gas connections for leaks. 

Seal all openings around pipes and wires with an outdoor 

grade silicone sealant. Seal the joint between the recess box 

and the siding or brick of the house with a silicone based seal-

ant to prevent water from getting behind the box into the wall.

Installing the Door 

- Lift the door up from the bot-

tom at a slight angle. Slip the door into the channel at the 

top of the recess box. Next push the bottom of the door 

flush with the recess box and slide down into the channel 

at the bottom of the enclosure. Do not block any air open-

ings on the door.

 

Security Clip

 - Before installing the door, slide the 

clip into the slot at the bottom of the door from the back-

side so it points straight down through the bottom of the 

door. Lift the door into place per the instruction above. As 

the door is being slid down into place, guide the security 

clip into the slot in the bottom channel of the recess box.

Once the clip is in place, secure with a suitable means 

(small padlock, security tag, etc.). 

Caulk Joint Between Siding 

and Recess Box

Seal all openings around pipes 

and wires with a silicone sealant

Sealing and Finish - 

Figure 8

Drip Ledge

Outer Door

Caulk Joint Between Siding 

and Recess Box

Siding or Brick

Security Clip

 

Figure 9

Padlock

Outer Door

Security Clip

Warning

 - All openings in the bottom of the recess box 

must be sealed to prevent water infiltration in to the wall.  Fail

-

ure to do so could result in damage to the wall.

!

Typical Installation - 

Figure 6

Recess Box

Wall Sheathing 

(Brick, Vinyl, etc)

Outdoor 

Tankless Water 

Heater

Isolation Valves

Power Disconnect

Pressure  

Relief Valve

Gas Service 

Valve

Thermostat 

Wire

Typical Installation and Finish - 

Figure 7

Drip Ledge

Siding or Brick

Recess Box

Brick Lintel

Lap Siding

Brick Siding

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