Rheem Water Heater RTH 74XN 1 User Guide

Rheem Tankless Outdoor  
Gas Water Heaters  
Available in 5.3 and 7.4 GPM Outdoor Models  
10-Year Limited Warranty on Heat Exchanger*  
3-Year Limited Warranty on Parts*  
New! UMC-117 remote control is included and can be set  
Energy saving design  
from the out-of-the-box 120 degrees – up to a 140  
Compact, space saving design  
Intelligent electronic controls designed to increase energy  
efficiency and safety  
degree maximum (additional remote control thermostats are available  
– sold separately)  
New! EZ-Linkcable connects two tankless  
units to operate as one – now available for high  
demand applications  
Self diagnostic program  
Digital display shows temperature setting and  
maintenance codes  
Exclusive! Guardian SBTsensing burner technology  
Exclusive! Guardian OFWoverheat film wrap  
Exclusive! Two high-altitude options – up to 6,560 or  
Built-in electric blower  
Environmentally friendly Low NOx burner meets  
SCAQMD rule 1146 requirements  
Features freeze protection to -30°F on RTG-74,  
-20° F on RTG-53  
9,840 ft. elevations above sea level (altitude chip required  
– sold separately)  
Exclusive! All Rheem tankless models are third-party  
certified by GAMA  
*See Residential Warranty Information Brochure for complete warranty information.  
If the water heater is installed anywhere other than a single family dwelling, such  
as a commercial application, or in any system in which the water is recirculated,  
the applicable warranty periods will be limited to one (1) year.  
Exclusive! All Rheem tankless models qualify for up to a  
$300 federal energy tax credit (refer to your tax advisor for details)  
Exclusive! All Rheem models can be linked in up to 20  
unit manifold installations by using the optional MIC-180  
and MICS-180 manifold control assembly  
Energy Factor and Average Annual  
Operating Costs based on D.O.E.  
®
(Department of Energy) test  
procedures. D.O.E. national average  
fuel rate natural gas 91¢/therm;  
Continuous hot water  
LP $1.23/gallon  
.
DESCRIPTION  
FEATURES  
ROUGHING IN DIMENSIONS (SHOWN IN INCHES)  
ENERGY INFO.  
D.O.E.  
GAS  
WATER FLOW RATE  
GPM @ 77° GPM @ 45°  
RISE MAX. RISE MAX.  
SHIP.  
WEIGHT  
(LBS.)  
INPUT  
BTU/HR.  
TEMP.  
RANGE*  
CONNECTION  
VENT  
DIAMETER  
ENERGY  
ANN.  
MODEL NUMBER  
TYPE  
HEIGHT  
WIDTH  
DEPTH  
FACTOR  
OP. COST  
WATER  
GAS  
21,600 -  
141,000  
100° to  
140° F  
$167 Nat  
$246 LP  
RTG-53XN†  
Outdoor  
3.1  
4.3  
5.3  
7.4  
3/4  
3/4  
20-1/2 13-3/4  
25-3/8 14-7/8  
5-1/4  
N/A  
N/A  
36  
55  
.82  
19,000 -  
199,900  
100° to  
140° F  
$167 Nat  
$246 LP  
RTG-74XN-1†  
Outdoor  
3/4  
3/4  
11-1/8  
.82  
Available in Natural Gas and Propane (LP). For Propane replace the N  
with a P when ordering.  
Proper gas pressure must be ensured to supply tankless gas water heaters – up to  
145,000 BTU for RTG-53 models and up to 199,900 BTU for RTG-74 models.  
(Consult your gas supplier)  
* Factory set maximum temperature is 120° F.  
• For installations above 3,280 feet a high altitude chip is required.  
Refer to Rheem price list or consult factory for details.  
• Consult factory for information on sizing the application.  
Temperature Rise (°F)  
35° 45° 50° 60° 70° 77° 80° 90° 100°  
Model Number  
RTG-53X Water Flow (GPM)  
RTG-74X Water Flow (GPM)  
6.8 5.3 4.7 3.9 3.4 3.1 3.0 2.6 2.4  
8.5 7.4 6.6 5.5 4.7 4.3 4.1 3.7 3.3  
Above estimates are for sizing purposes only.  
These units are designed to meet  
or exceed ANSI (American National  
Standards Institute) requirements and have  
been tested according to D.O.E. test proce-  
dures and meet or exceed the energy effi-  
ciency requirements of NAECA, ASHRAE  
standard 90, ICC Code and all state energy  
efficiency performance criteria for energy  
consuming appliances.  
Recess Box for Rheem  
Tankless Outdoor Units  
Now Available  
Contact your wholesale or local  
Rheem representative for the recess  
box that meets your application.  
Before purchasing this appliance, read  
important energy cost and efficiency  
information available from your supplier.  
In keeping with its policy of continuous progress and product improvement, Rheem reserves the right to make changes without notice.  
Rheem Water Heating • 101 Bell Road, Montgomery, Alabama 36117-4305 • www.rheem.com  
PRINTED IN U.S.A  
07/06 WP  
FORM NO. 101-41  
Download from Www.Somanuals.com. All Manuals Search And Download.  

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