Rinnai RU98e Specification
RU98e (KB3237WD)
Type of Appliance
Rinnai model number
Operation / Installation
Minimum/Maximum Gas Rate (Input)
Electrical
Electrical Consumption
Ignition System
Hot Water Capacity
Temperature
Temperature (without remote)
Approved Gas Types
Energy Factor (EF)
Service Connections
Isolation & Pressure Relief Valves Included
Water Flow Control
Minimum/Maximum Water Supply Pressure
Condensing, Tankless, Temperature controlled, continuous flow,
gas hot water system, Energy Star Qualified
REU-KB3237WD-US
Forced combustion; outdoor only
15,200 - 199,000 BTU/h
Appliance: AC 120 Volts - 60 Hz
Temperature Controller: DC 12 Volts
Normal: 63 w Standby: 2 w Anti-frost protection: 168 w
Direct electronic ignition
Minimum flow rate: 0.26 GPM
Minimum activation flow rate: 0.4 GPM
Maximum flow rate: 9.8 GPM
98° - 120° F (factory default) Maximum temperature is selectable at
120° F or at 140° F; 98° - 185° F available with the MCC-91-2
controller for commercial and hydronic applications
120° F (factory default) or 140° F
Natural or Propane (ensure unit matches gas type)
Natural Gas: 0.95 Propane: 0.95
Gas supply: 3/4 inch MNPT
Cold water inlet: 3/4 inch MNPT
Hot water outlet: 3/4 inch MNPT
Heavy duty forged brass Webstone Isolator valves EXP E2, certified
to NSF/ANSI 61-8 for potable water
Water flow sensor, electronic water control and by-pass control
15 - 150 PSI (50 PSI or above is recommended for maximum flow)
Rinnai is continually updating and improving products; therefore, specifications are subject to change without prior
notice. Local, state, provincial and federal codes must be adhered to prior to installation.
FLOW TABLE
10.0
9.0
8.0
7.0
6.0
5.0
4.0
Water Flow (gpm)
3.0
2.0
1.0
0.0
0 25 50 75 100 125 150
delta T - Temperature Rise (ºF)
© 2012 Rinnai Corporation
RU98e SP 3/2012
RU98e (KB3237WD)
Controller
Controller Cable
Safety Devices
Clearances from Combustibles
Clearances from Non-combustibles
* 24 inches required for serviceability
Min. / Max. Gas Supply Pressure
Manifold Gas Pressure (inches W.C.)
NOx
MC-91-2US (included)
Deluxe controller: MC-100V-1US (optional)
Bathroom controller: BC-100V-1US (optional)
MCC-91-2US (optional; for hydronic and commercial applications)
Non-polarized two-core cable, minimum 22 AWG
• Flame failure - Flame Rod
• Boiling protection
• Combustion fan rpm check
• Over current - glass fuse
• Top of heater - 12 inches
• Front (Panel) - 24 inches
• Front (Exhaust) - 24 inches
• Top of heater - 2 inches
• Front (Panel) - 0 inches *
• Front (Exhaust) - 24 inches
• Remaining flame (OHS)
• Thermal fuse
• Automatic frost protection
• Back of heater - 0 inches
• Bottom of heater - 12 inches
• Sides of heater - 6 inches
• Back of heater - 0 inches
• Bottom of heater - 2 inches
• Sides of heater - 1/8 inch
Natural Gas: min 5” W.C. max 10.5” W.C.
Propane Gas: min 8” W.C. max 13.5” W.C.
Natural Gas: high fire 3.0” W.C. low fire 0.46” W.C.
Propane Gas: high fire 3.5” W.C. low fire 0.50” W.C.
Complies with South Coast Air Quality Management District 14 ng/J or
20 ppm NOx emission levels
Limited
Warranty
DIMENSIONS
0.6 (15) 2.0 (50)
Heat exchanger: 12 years* for residential, 10 years for residential and space heating, and 5 years* for
commercial; All other parts: 5 years*; Labor: 1 year;
(* 3 years if used as a circulating water heater within a circulation loop, when the water heater is in
series with a circulation system and all circulating water flows through the water heater, and where an
aquastat / thermostat, timer, or an on-demand recirculation system is not incorporated.)
Refer to the manual for complete warranty information.
18.5 (470)
10.0 (253.8)
WEIGHT: 70.5 lb (32 kg)
0.4 (10.1) 0.6 (15)
10.1 (257.5)
8.7 (222) A
C
B
D
E
DIM Inches (mm)
25.7 (654)
28.4 (721.6)
A (GAS) 1.6 (40.2)
A (COLD) 2.0 (50.2)
A (HOT) 1.6 (41.2)
A (CONDENSATE
OUTLET)
B 5.0 (127.2)
C 1.9 (47.8)
D 0.52 (13.3)
0.9 (22.4)
H
G
F
K
DIM Inches (mm)
E 2.2 (56.3)
F 2.3 (58.3)
G 5.0 (127.2)
H 2.0 (50)
I 3.0 (76)
J 7.1 (179)
K 18.3 (466)
J
I
Rinnai Corporation • 103 International Drive • Peachtree City, GA 30269 • Toll-Free: 1-800-621-9419 • Fax: 678-829-1666 • www.rinnai.us
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