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
from the out-of-the-box 120 degrees – up to a 140
degree maximum (additional remote control thermostats are available
– sold separately)
•New! EZ-Link™cable connects two tankless
units to operate as one – now available for high
demand applications
•Exclusive! Guardian SBT™sensing burner technology
•Exclusive! Guardian OFW™overheat film wrap
•Exclusive! Two high-altitude options – up to 6,560 or
9,840 ft. elevations above sea level (altitude chip required
– sold separately)
•Exclusive! All Rheem tankless models are third-party
certified by GAMA
•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
•Continuous hot water
•Energy saving design
•Compact, space saving design
•Intelligent electronic controls designed to increase energy
efficiency and safety
•Self diagnostic program
•Digital display shows temperature setting and
maintenance codes
•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
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
In keeping with its policy of continuous progress and product improvement, Rheem reserves the right to make changes without notice.
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.
Before purchasing this appliance, read
important energy cost and efficiency
information available from your supplier.
DESCRIPTION FEATURES ROUGHING IN DIMENSIONS (SHOWN IN INCHES) ENERGY INFO.
GAS WATER FLOW RATE SHIP. D.O.E.
INPUT TEMP. GPM @ 77° GPM @ 45° CONNECTION VENT WEIGHT ENERGY ANN.
MODEL NUMBER BTU/HR. TYPE RANGE* RISE MAX. RISE MAX. WATER GAS HEIGHT WIDTH DEPTH DIAMETER (LBS.) FACTOR OP. COST
RTG-53XN
†
21,600 - Outdoor 100° to 3.1 5.3 3/4 3/4 20-1/2 13-3/4 5-1/4 N/A 36 .82 $167 Nat
141,000 140° F $246 LP
RTG-74XN-1
†
19,000 - Outdoor 100° to 4.3 7.4 3/4 3/4 25-3/8 14-7/8 11-1/8 N/A 55 .82 $167 Nat
199,900 140° F $246 LP
†
Available in Natural Gas and Propane (LP). For Propane replace the N
with a P when ordering.
* 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)
Model Number 35°
45° 50° 60° 70° 77° 80° 90° 100°
RTG-53X Water Flow (GPM) 6.8 5.3 4.7 3.9 3.4 3.1 3.0 2.6 2.4
RTG-74X Water Flow (GPM) 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.
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)
*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.
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;
LP $1.23/gallon
.
