Installation Manual
Rinnai Tankless Rack System (TRS) Installation Manual     11 
TRW03CU 
TRW23CU 
Rack Frame - Specifications  
Frame Material 
14 Gauge  
Hot Rolled Steel  
1.5” Square Tube 
16 Gauge 
Stainless Steel 
1.5” Square Tube 
14 Gauge  
Hot Rolled Steel 
1.5” Square Tube 
16 Gauge 
Stainless Steel 
1.5” Square Tube 
Frame Finish 
Powder Coat  Stainless   Powder Coat  Stainless  
Color 
Gray  Stainless  Gray  Stainless 
Water & Gas Connections      
Hot Water Trunk Line Diameter  2"  
Cold Water Trunk Line Diameter  2"  
Hot Water Trunk Line Material  Rigid Copper  
Cold Water Trunk Line Material  Rigid Copper  
Water Trunk Connection Type  2" PIPE  
Gas Trunk Line Diameter  1-1/4"  
Gas Trunk Connection Type  1-1/4” MNPT  
Gas Trunk Line Material  Sch 40 Steel  
Gas Branch Line Material  PVC Over CSST  
Electric Requirements  
Voltage  AC 120 Volts - 60 Hz  
Maximum Current (Amperes)  12   8 
BTU and Flow Rates for CU199i, CU199e (NG/LP) 
Number of Tankless Water Heaters  3  2 
Flow rate @ 70°F rise (gpm)  16.2   10.8 
Flow rate @ 100°F rise (gpm)  11.4   7.6 
Minimum input rate (Btuh)  15,200   15,200 
Maximum input rate (Btuh)  597,000   398,000 
Model  TRW03CUi  TRW03CUe  TRW23CUi  TRW23CUe 
Water Heater Model 
CU199i (NG/LP)  CU199e (NG/LP)  CU199i (NG/LP)  CU199e (NG/LP) 
Crate Dimensions (HxLxD) - in  66 x 70 x 35   66 x 70 x 35  
Weight - Fully Assembled - lbs  248  244  186  183 
Weight - Shipping (total) - lbs  469  465  407  402 
CU Series 3-Unit Wall-Hanging Frame (Connued) 










