Dimensions Guide

1
Minimum ow may vary slightly depending on the temperature seng and the inlet water temperature.
Minimum acvaon ow is 0.4 GPM (1.5 L/min).
2
The maximum gas supply pressure must not exceed the value specied by the manufacturer.
* Clearance for servicing is 24 in. (610 mm) in front of water heater
in. (mm)
SPECIFICATION RUCS75i
Dimensions - w, h, d 18.3 in. x 31.1 in. x 10.1 in. (466 mm x 789.6 mm x 257 mm)
Minimum Gas Consumpon
Btu/h
10,300
Maximum Gas Consumpon
Btu/h
160,000
Flow Rate
1
(Min - Max) 0.26 - 7.5 GPM (1.0 - 28.4 L/min)
Weight 57.3 lbs. (26kg.)
Sound Level 47 dB
Normal 89 W
Standby 1.3 W
Freeze Protecon 167 W
Max Current 2.3 Amps
Fuse 10 Amps
Temperature (with remote)
120° - 140° F (49°C - 60°C)
Temperature (without
remote)
120° F (49°C), 125° F (52°C), 135° F (57°C), 140° F (60°C)
Gas Supply Pressure
2
• Natural: 4 in. w.c. - 10.5 in. w.c. (2.5 mbar – 26.1 mbar)
• Propane: 8 in. w.c. - 13.5 in. w.c. (20 mbar – 33.6 mbar)
Ignion System Direct Electronic Ignion
Electronic Connecons
• Appliance: AC 120 Volts, 60Hz.
• Temperature Controller: DC 12 Volts (Digital)
Water Supply Pressure
• Minimum: 50 PSI (Recommended 60-80 PSI for max
performance)
• Maximum: 150 PSI
Controller Cable Non-Polarized Two Core Cable (Minimum 22 AWG)
Service Connecons
• Gas Supply: 3/4 in. (19 mm) NPT
• Cold Water Inlet: 3/4 in. (19 mm) NPT
• Hot Water Outlet: 3/4 in. (19 mm) NPT
• Condensate Drain: 1/2 in. (13 mm) NPT
Clearances from
Combusbles
Clearances from
Non-Combusbles
Electrical
• Top: 6 in. (152 mm)
• Boom/Ground: 12 in. (305 mm)
• Front: 6 in. (152 mm)*
• Back: 0 in.
• Sides: 2 in. (51 mm)
• Vent: 0 in.
FRONT
BOTTOM
1.2 (30.7)
31.1 (789.6)
5.5 (140.2)
5.9 (150)
2 (50.6)
SIDE
10.1 (257)
25.7 (653.2)
28.5 (723)
8.73 (221.8)






 

DIM Inches (mm)
A (GAS) 1.3 (33.2)
A (COLD) 1.93 (49)
A (HOT) 1.35 (34.4)
A (CONDENSATE OUTLET) 0.94 (23.9)
B 3.93 (100)
C 1.91 (48.6)
DIM Inches (mm)
D 0.09 (2.2)
E 5.6 (142.3)
F 3.24 (82.4)
G 3.99 (101.4)
H 1.58 (40.1)
I 3.17 (80.4)
J 18.3 (466)
Water Flow GPM (L/min)
Delta T - Temperature Rise ºF (ºC)
25 (13.9)
50 (27.8) 75 (41.6)
100 (55.6)
125 (69.4) 150 (83.3)
(37.9)
10.0
(34.1)
(26.5)
(30.3)
(19.0)
(22.7)
(15.1)
0.0
9.0
8.0
(7.6)
2.0
(3.8)
1.0
6.0
7.0
4.0
5.0
(11.4)
3.0
• Top: 2 in. (51 mm)
• Boom/Ground: 12 in. (305 mm)
• Front: 6 in. (152 mm)*
• Back: 0 in.
• Sides: 1/2 in. (13 mm)
• Vent: 0 in.
F G
E
A
0