Specification Sheet

PRINTED IN U.S.A. 12/20 WP FORM NO. TKE-101 Rev. 6
2
Rheem.com
| 800.374.8806
Manufacturers National Service Department
400 Captain Neville Drive, Waterbury, CT 06705
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.
Specifications
Water
INTEGRATED HOME COMFORT
Residential Electric
Professional Classic
Tankless Water Heaters
* 240V units can be used on 208V single phase with 25% reduced temperature output. Please note per UL standards the rating plate and installation instructions will all be according to a
240V applied voltage. Check with local officials prior to derating the electrical infrastructure.
DESCRIPTION FEATURES ROUGHING IN DIMENSIONS (SHOWN IN INCHES)
MODEL NUMBER kW AMPS
RECOMMENDED
BREAKER
SIZE VOLTAGE
RECOMMENDED
WIRE SIZE (CU)
MIN.
FLOW
(GPM)
MAX.
FLOW
(GPM) HEIGHT WIDTH DEPTH
WATER
CONN.
SHIP
WEIGHT
(LBS.)
120V 1 HEATING CHAMBER
RTEX-04 3.5 29A (1x30)A 120 10 AWG 0.3 1.5 5-7/8 10-7/8 2-3/4 1/2 NPT 4.5
240V* 1 HEATING CHAMBER
RTEX-06 6.0 25A (1x25)A 220 10 AWG 0.3 2.0 5-7/8 10-7/8 2-3/4 1/2 NPT 4.5
RTEX-08* 7.3 33A (1x40)A 240 8 AWG 0.3 4.8 12-5/8 8-1/4 3-5/8 1/2 CF 7
RTEX-11* 11.8 46A (1x50)A 240 6 AWG 0.3 4.8 12-5/8 8-1/4 3-5/8 1/2 CF 8.5
RTEX-13* 13.0 54A (1x60)A 240 6 AWG 0.3 4.8 12-5/8 8-1/4 3-5/8 1/2 CF 8.5
240V* 2 HEATING CHAMBERS
RTEX-18* 18.0 75A (2x40)A 240 8 AWG 0.3 7.0 18-1/4 14-1/2 3-1/2 3/4 NPT 14.78
240V* 3 HEATING CHAMBERS
RTEX-24* 24.0 100A (3x40)A 240 8 AWG 0.3 7.0 18-1/4 17-5/8 3-1/2 3/4 NPT 17.8
RTEX-27* 27.0 113A (3x40)A 240 8 AWG 0.3 7.0 18-1/4 17-5/8 3-1/2 3/4 NPT 17.8
240V* 4 HEATING CHAMBERS
RTEX-36* 36.0 150A (4x40)A 240 8 AWG 0.3 8.0 18-1/4 21-5/8 3-1/2 3/4 NPT 22.7
Rated Pressure 25 PSI min., 150 PSI max.
Certifications ETL Listed to UL 499 and CSA
Std. Temp. Settings 120°F (Adjustable 80°F-140°F)
Temp. Accuracy +/–1° at steady flow
Turn-On 0.3 GPM
Product
Specifications
(all models)
RHEEM
PART NUMBER
GPM RATING OF
INSERTS PROVIDED
CONNECTION
SIZE
RTE10001A 1.0, 1.5, 2.0 1/2" NPT
RTE10001B 2.0, 3.0, 4.0, 5.0 3/4" NPT
Optional Inline Flow Regulator
• Enhanced outlet temperature control
• Install on the outlet side of the heater
• Limit maximum volume to the specified flow
rate to ensure exiting temperature is within an
acceptable range
• Flow Regulators for ½" and ¾" NPT plumbing
connections
• Flow range: 1 to 5 gallons per minute
Suggested Sizing Guide
MODEL
NUMBER
FLOW
REGULATOR
PART NO.
GPM INSERT TO USE BASED ON
INLET WATER TEMPERATURE
40°F 50°F 60°F 70°F
RTEX-04 N/A N/A N/A N/A N/A
RTEX-06 N/A N/A N/A N/A N/A
RTEX-08 RTE10001A 1.0 1.0 1.0 1.5
RTEX-11 RTE10001A 1.0 1.0 1.5 2.0
RTEX-13 RTE10001A 1.0 1.0 1.5 2.0
RTEX-18 RTE10001B 2.0 2.0 2.0 3.0
RTEX-24 RTE10001B 2.0 2.0 3.0 4.0
RTEX-27 RTE10001B 2.0 3.0 4.0 5.0
RTEX-36 RTE10001B
3.0 4.0 5.0 5.0
Suggested Specifications
Unit shall have copper clad immersion heating element(s) with brass
terminations for increased durability. External temperature control
and display adjustable in 1° increments with a range of 80°-140°F.
Display shall be capable of displaying setpoint temperature in
Celsius or Fahrenheit temperature scales. Unit shall utilize a flow
meter with a 0.3 gpm activation point and manage power based on
actual flow rate and inlet temperature. Values should be processed
60 times per second. Unit shall be WQA certified lead free, certified
to UL499 and CSA C22.2 No.64.