Rinnai Ruc98I Reu Kbd3237Ffud Specification Sheet
2015-05-15
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RUC98i-SP 6/2014
Type of Appliance
Rinnai model number
Operation / Installation
Minimum/Maximum Gas Rate (Input)
Electrical
Electrical Consumption
Amperage
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-KBD3237FFUD-US
Forced combustion; indoor only; Certified for installation in
Manufactured (Mobile) Homes
15,200 - 199,000 BTU/h (4.5-58.3 kWh)
Appliance: AC 120 Volts - 60 Hz
Temperature Controller: DC 12 Volts
Normal: 64 w Standby: 2 w Anti-frost protection: 146 w
Max with pump: 8A Max without pump: 4A Fuse: 10A
Direct electronic ignition
Minimum flow rate: 0.26 GPM (1 l/min)
Minimum activation flow rate: 0.4 GPM 1.5 l/min)
Maximum flow rate: 9.8 GPM (37.1 l/min)
98° - 120° F (37°- 49°C) (factory default) Maximum temperature is
selectable at 120° F (49°C) or at 140° F (60°C); 98° - 185° F
(37°- 49°C) available with the MCC-91-2 controller for commercial
and hydronic applications
120° F (49°C) (factory default) or 140° F (60°C)
Natural or Propane (ensure unit matches gas type)
Natural Gas: 0.95 Propane: 0.95
Gas supply: 3/4 inch (19mm) MNPT
Cold water inlet: 3/4 inch (19mm) MNPT
Hot water outlet: 3/4 inch (19mm) 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 (104-1035 KPa) (50 PSI (345 KPa) or above is
recommended for maximum flow)
RUC98i (KBD3237FFUD)
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
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
025 50 75 100 125 150
kA3237
Water Flow gpm (l/min)
delta T - Temperature Rise ºF (ºC)
(37.9)
10.0
(34.1)
(11.4)
(7.6)
(3.8)
(26.5)
(30.3)
(19.0)
(22.7)
(15.1)
0.0
9.0
8.0
2.0
1.0
6.0
7.0
4.0
5.0
3.0
25 (13.9) 50 (27.8) 75 (41.6) 100 (55.6) 125 (69.4) 150 (83.3)
© 2014 Rinnai America Corporation
Rinnai Corporation • 103 International Drive • Peachtree City, GA 30269 • Toll-Free: 1-800-621-9419 • Fax: 678-364-8643 • www.rinnai.us
RUC98i (KBD3237FFUD)
DIMENSIONS
DIM Inches (mm)
A (GAS) 1.6 (40.2)
A (COLD) 2.0 (50.2)
A (HOT) 1.6 (41.2)
A (CONDENSATE
OUTLET) 0.9 (22.4)
B 5.0 (127.2)
C 1.9 (47.8)
D 0.52 (13.3)
B
C
I
J
D
E
F
G
H
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)
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.
Limited
Warranty
WEIGHT: 61.7 lb (28 kg)
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 - 6 inches (152.4mm)
Front of heater - 6 inches *(152.4mm)
Sides of heater - 2 inches (50.8mm)
Top of heater - 2 inches (50.8mm)
Front of heater - 6 inches *(152.4mm)
Sides of heater - 1/2 inches (12.7mm)
Natural Gas: min 4” W.C. (2.5mbar) max 10.5” W.C. (26.1mbar)
Propane Gas: min 8” W.C. (20mbar) max 13.5” W.C. (33.6mbar)
Natural Gas: high fire 3.0” W.C. (7.5mbar) low fire 0.42” W.C. (1.1mbar)
Propane Gas: high fire 3.5” W.C. (8.7mbar) low fire 0.47” W.C. (1.2mbar)
Complies with South Coast Air Quality Management District 14 ng/J or
20 ppm NOx emission levels
g
Direct Vent system designed for use with Ubbink Polypropylene Concentric
Vent, Twin Pipe PVC/CPVC (3” and 4” configurations), or Centrotherm 3”
Polypropylene (with Centrotherm Twin Pipe Adapter) See installation and
operation manual for details regarding installation and allowed vent lengths.
Remaining flame (OHS)
Thermal fuse
Automatic frost protection
Back of heater - 0 inches
Bottom of heater - 12 inches (304.8mm)
From vent pipe - 0 inches
Back of heater - 0 inches
Bottom of heater - 12 inches (304.8mm)
From vent pipe - 0 inches
Controller
Controller Cable
Safety Devices
Clearances from Combustibles
* 24 inches (609.6mm) required for service
Clearances from Non-combustibles
* 24 inches (609.6mm) required for service
Min. / Max. Gas Supply Pressure
Manifold Gas Pressure (inches W.C.)
NOx
Venting
External Recirculation Pump Control Built in Rinnai Circ-Logic™ : Recirculation program cycles external pump
ø 5.5 (140.2)
31.2 (791.3)
2.02 (51.3)
20.6 (523.3)
2.8 (70.1)
10.1 (257.7)
28.5 (723.3)
25.7 (654)
8.7 (222) A
1.2 (31.2)
2.9 (74.6)
5.9 (150)
