Technical Specifications
Rheem Water Heating • 1115 Northmeadow Parkway, Suite 100
Roswell, Georgia 30076 • www.rheem.com
PRINTED IN U.S.A. 02/18 WP FORM NO. 101-42 N Rev. 8
INTEGRATED HOME COMFOR
T
INTEGRATED HOME COMFORT
In keeping with its policy of continuous progress and product improvement, Rheem reserves the right to make changes without notice.
Marathon
®
Specifications
2
Water
INTEGRATED HOME COMFORT
Electric
Marathon Water Heaters
A
C
B
5-3/4"
3/4" NPT
DESCRIPTION FEATURES
ROUGHING IN DIMENSIONS (SHOWN IN INCHES) ENERGY INFO.
T
Y
P
E
NOMINAL
GALLON
CAPACITY
RATED
GALLON
CAPACITY
MODEL
NUMBER
UEF
FIRST HOUR
RATING
G.P.H.
RECOVERY
IN G.P.H.
90° F RISE
TANK
HEIGHT
A
HEIGHT TO
WATER CONN.
B
DIAMETER
C
APPROX.
SHIP WT.
(LBS.)
UNIFORM
ENERGY
FACTOR
(UEF)
Tall 30 28 MR30238C
†
38 17 49 49-1/2 21-5/8 75 0.88
Tall 30 28 MR30245C
†
38 21 49 49-1/2 21-5/8 75 0.88
Tall 40 38 MR40245C
†
51 21 61-1/2 65-1/2 21-3/4 90 0.92
Tall 50 50 MR50245C
†
57 21 62-3/4 66-3/4 23-1/2 100 0.91
Short 50 48 MSR50245C
†
41 21 43-1/4 47-1/4 28-1/4 95 0.90
Tall 85 84 MRG85245C* 77 21 66-1/4 70-1/4 28-1/4 134 0.92
Tall 100 101 MRG105245C* 83 21 66-3/4 70-3/4 30-1/4 152 0.90
Uniform Energy Factor and rated gallon capacity based on Department of Energy (DOE) requirements.
* This water heater is intended only for use as part of an electric thermal storage or demand response program. This water heater
will not provide adequate hot water unless enrolled in such a program and is activated by your utility company or another program
operator. Please confirm the availability of such a program in your local area before purchasing or installing this product.
Water heaters furnished with standard 240 or 120 volt AC, single phase non-simultaneous wiring. If heating elements of different
wattages than those shown are demanded, they must be specifically requested. For height to top of T&P and heat traps add 3-1/2”
to the height to water connection.
Maximum test pressure: 300 PSI. Maximum working pressure: 150 PSI.
* *Recovery calculations used are based on 4500 watt elements used in non-simultaneous operation.
**Recovery = wattage/2.42 x temp. rise °F.
Example: 4500W = 21 GPH
2.42 x 90°
†
LEED Point = 1