Model Breakdown
• Model: RHHH1600NAIF2EXN
• Series: Rheos
• Input Capacity: 1,600,000 BTU/h
• Fuel Type: Natural Gas
• Altitude Rating: Universal (0–10,000 ft)
• Location: Indoor installation
• Firing Mode: Modulating
• Heat Exchanger: Glass-lined steel with copper tubes
• Control Package: Standard (meets CSD-1 boiler standard)
• Pump Option: Normal water pump

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⚙️ Key Specifications
• Thermal Efficiency: Up to 92.1%
• Modulation Range: 400,000 to 1,600,000 BTU/h
• Flow Rate: Up to 169 GPM with a 17°F temperature rise, depending on water hardness and system configuration
• NOx Emissions: Less than 10 ppm
• Vent Size: 6”
• Air Intake Size: 8”
• Dimensions (W × H × D): 34.5” × 65.75” × 55”
• Weight: Approximately 1,200 lbs

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️ Standard Features
• Modulating burner with 25% to 100% firing rate
• Copper primary and stainless steel secondary heat exchangers
• Internal water mixing system to allow minimum 50°F water inlet
• Water flow switch
• Low water cutoff with test light and manual reset button
• Manual reset high limit
• High and low gas pressure switches
• Air pressure switch
• Low-fire start time delay
• ASME CSD-1 compliance
• Leak test valve
• Indicator/status lights for power on, call for heat, pre-purge, burner on, and ignition failure
• Selector switch for internal or external (0-10VDC) control
• Ignition lockout alarm (dry contacts)
• Condensate overflow protection switch
• Manual firing valve
• ASME 160 lb. w.p. heat exchanger with “H” stamp
• Pump mounted with adjustable time delay (0.1 - 10 min.)
• 75 psi pressure relief valve
• Temperature and pressure gauge

Applications

The Rheos RHHH1600NAIF2EXN is ideal for large-scale commercial applications such as:
• Hotels
• Hospitals
• Multi-family residential buildings
• Educational institutions
• Industrial facilities
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