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Rinnai Q175S Fascicule

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Q175S / Q205S Condensing Boiler 
Q175S / Q205S SP 
2/2011 
© 2011 Rinnai Corporation 
SPECIFICATIONS 
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. 
Standard Features 
•  Onboard outdoor reset control system with sensor standard 
•  Prebuilt plumbing kit with insulated Low Loss Header 
•  Priority DHW standard (3 way valve not included) 
•  Domestic hot water plate warming 
•  Modulating Ceramic premix burner 
•  5:1 turn down ratio 
•  Spark ignition 
•  Exceeds SCAQMD 1146.2 Low NO
x
 requirements 
•  Stainless Steel Water tube condensing heat exchanger 
•  Direct Vent sealed combustion 
•  Concentric and twin pipe venting adapters included 
•  Approved for room and closet installations 
Optional Accessories 
•  3 way valve DHW kit 
•  RS100 Single zone controller 
•  Flue Gas temperature sensor 
•  Room Air Filter 
•  NG to LP conversion Kit 
•  LP to NG Conversion Kit 
General Specifications  
 
Boiler 
Model 
Boiler 
Model 
Q175S Q205S 
Water content 
gal 
 1.8 
1.8 
Max. supply boiler 
temperature 
°F 176 176 
Max operating pressure 
psi 
45 
45 
Relief valve rating 
MBH 
375  
375  
Relief valve pressure rating 
psi 
30 
30 
Dry weight 
lbs 
141 
141 
Min inlet gas pressure NG 
"W.C. 
4.0" 
4.0" 
Max inlet gas pressure NG 
"W.C. 
10.5" 
10.5" 
Min inlet gas pressure LP 
"W.C. 
8.0" 
8.0" 
Max inlet gas pressure LP 
"W.C. 
14.0” 
14.0” 
Max equivalent exhaust 
vent length 
ft 80 40 
Max equivalent combustion 
air vent length 
ft 80 40 
Approved venting materials 
  
Polypropylene, 
Stainless Steel, 
PVC, CPVC  
Units  
Performance Specifications 
  
Units 
 
Q175S Q205S 
Fuel Type 
  
NG/LP 
NG/LP 
Input MBH 
175 
205 
Heating Capacity 
MBH 
161 
189 
AFUE (I=B=R) 
% 
95.7 
95.7 
Part Load Efficiency 
(EN677) 
% 98.5 
98.5 
Boiler Model  
Electrical Specifications 
 Units 
 
Q175S Q205S 
Electrical Voltage Mains 
 V/Hz 
120/60 
120/60 
Electrical Voltage Controls 
V 
24 
24 
Power Consumption Max 
Load 
W 210 234 
Power Consumption Stand 
by Load 
W 14 14 
Recommended Circuit 
breaker rating 
A 15 15 
Boiler Model