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The ProLineĀ® XE Combi Boiler comes with an industry-leading 4.8 gal/min capacity which is enough flow for a standard 2-1/2 bath home. The efficiency of the combi is rated at 95% AFUE (Annual Fuel Utilization Efficiency) making it available on many utility rebate programs. Lastly, the plain text Setup Wizard on the Smart Control LCD display will make installation a breeze.

The ACB-199H-N indoor residential Ultra-Low NOx Combi Boiler uses up to 199,999 BTU/hr of Natural Gas to deliver a continuous supply of hot water and space heating for a home in high altitude regions. This High Efficiency heating system has a 95% AFUE and is ENERGY STAR Certified.

  • Advanced Electronic Controls - User-friendly LCD display provides system status and diagnostic information in plain text. The Set-Up Wizard display makes it simple to set system parameters in just minutes.
  • Space Heating Reliable hot water supply to provide hydronic heat for the entire house in addition to supplying enough domestic hot water for a single family home or apartment.
  • Easy Direct Venting - Direct venting up to 100 feet using either PVC, CPVC, polypropylene or AL29-4C stainless steel vent pipe, allows for flexibility and easy installation.
  • Fire-Tube Heat Exchanger - The innovative fire tube design can produce a higher heat transfer coefficient than traditional fire tubes.
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Fuel Type:

Natural Gas

BTU Output:


BTU (Max):


BTU (Min):


DOE Rating:


IBR Rating:




System Type:

Hydronic (Water)

Vent Type:

Direct Vent

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Combo DHW

High Altitude

LCD Display

Energy Star Rated:



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