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Simulation feed forward and feedback 

MC-91-1US (included) 
Deluxe controller: MC-100V-1US (optional) 
Bathroom controller: BC-100V-1US (optional) 
Wireless controller (with transceiver): MC-502RC-1US-MS (optional) 

Non-polarized two-core cable 

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Flame failure - Flame Rod 

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Boiling protection  

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Combustion fan rpm check 

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Over current - glass fuse (3 amp) 

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Top of heater - 6 inches 

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Front of heater - 6 inches 

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Sides of heater - 2 inches 

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Top of heater - 2 inches 

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Front of heater - 6 inches 

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Sides of heater - 1/2 inches 

Natural Gas:  min 6”  W.C. 

max 10.5”  W.C. 

Propane Gas:  min 10”  W.C. 

max 13.5”  W.C. 

Natural Gas:  high fire 3.7”  W.C.  low fire 0.77”  W.C.  
Propane Gas:  high fire 4.2”  W.C.   low fire 0.93”  W.C. 

Meets California and Texas NOx Emission Rules 

Commercial only; heat exchanger 5 years*; 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) 

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Remaining flame (OHS) 

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Thermal fuse  

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Automatic frost protection 

 

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Back of heater - 0 inches 

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Bottom of heater - 12 inches 

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From vent pipe - 0 inches 

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Back of heater - 0 inches 

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Bottom of heater - 12 inches 

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From vent pipe - 0 inches 

Water Temperature Control 

Remote Controls 

 
 
 
Remote Control Cable 

Safety Devices 
 
 
 

Clearances from combustibles 
(suitable for closet, attic, and 
crawl space installations) 

Clearances from non-combustibles 

 
 
Min. / Max.  Gas Supply Pressure 

 
Manifold Gas Pressure (inches W.C.) 

 
NOx 

Warranty 

C53i (2520FFUC)    

Rinnai Corporation

 • 103 International Drive • Peachtree City, GA 30269 • Toll-Free: 1-800-621-9419 • Fax: 678-364-8643 • www.rinnai.us 

DIMENSIONS 

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. 

WEIGHT: 49 LBS

 

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