DCB/DCC High Efficiency Wall Mounted Modulating Condensing Boiler


'The Intelligent, Condensing Approach'

Boiler with AI [Artificial Intelligence] Control Technology

• Automatically sets up the boiler during initial startup
• Recognizes Natural or LP Gas
• Continuously monitors combustion and adjusts gas and air flow to optimize combustion and fuel savings
• User Interface displays temperature status symbols and self diagnostics
• Stainless steel burner
• Stainless steel heat exchanger
• Connections for an Indirect Tank

Combi Model

• 153,000 BTU/hr DHW input
• Stainless steel domestic hot water heat exchanger with 3.5 GPM flow rate @70° F rise


  • 95% efficient and meets the criteria for Energy Star 2018 Most Efficient.
  • 7:1 Gas Modulation in Combi Mode
  • 5.7:1 Gas Modulation in Heating Mode
  • Auto Commissioning and Continuous Calibration functions optimize combustion and result in lower fuel bills
  • Features 316L Stainless Steel Heat Exchanger and Burner
  • Features such as, high limit sensors, pressure relief valve, low water sensor, and system pressure gauge ensure safety and top performance of the unit
  • Control Panel features a backlit digital display that indicates boiler status, temperature, and diagnostics
  • Pre-heat function
  • Built in 2-speed Pump contributes to savings in electrical usage



Our AI control technology is programmed to recognize an Indirect Tank. Dunkirk H2O Indirect Hot Water Heaters are available in 30 to 115 gallon capacities and feature 316L stainless steel construction and top connections for an easy installation.


(See Installation, Operation and Maintenance Manual for complete instructions)


Boiler Control Module: High Limit/Electronic Ignition Control.
User Display Interface: Digital Temperature Display with diagnostics and programmable settings.
Heat Exchanger: Stainless Steel
-3-Way Water Diverting Valve
Combustion: Automatically modulating gas valve with 5.7:1 Turndown for Heating Mode & 7:1 for DHW Mode, Stainless Steel Burner, Direct Spark Ignition, Separate Flame Sensor, 100% shutoff
Other: Assembled Boiler with Jacket, Induced Draft Fan, Circulator Pump, 30psi Relief Valve, Low Water Pressure Switch, Air Pressure Switch, Temperature/Pressure Gauge

DCB-125 DHW Model: Stainless Steel Brazed Plate Heat Exchanger

Documents / Resources

Product Testimonials

  • My friend is also in the HVAC field and said Dunkirk is extremely reliable and efficient.

    Elmira, NY
  • The boiler is efficient, and free's up space in my boiler room.

    Bronx, NY