AHRI Certified|CSA Certified|ENERGY STAR Certified

• Adapter-free flue connection - multi-material connector allows either PVC, CPVC, polypropylene or stainless steel connection directly to the appliance without adapters NOBLE® also has a built-in combustion analyzer port Direct venting up to 100 ft - offers five venting options for tremendous installation flexibility It permits direct vent air intake and exhaust runs up to 100 equivalent feet using either PVC, CPVC, polypropylene or AL29-4C stainless steel vent pipe Advanced negative regulation technology - safely and reliably operates with supply gas pressure as low as 4 in water column Its negative regulation (neg/reg) technology eliminates mechanical dampers as it automatically adjusts fan speed to ensure the correct volume and mix of fuel and air throughout the firing range Innovative fire tube heat exchanger - the fire tube design can produce a higher heat transfer coefficient than traditional fire tubes Brazed plate heat exchanger - the stainless steel heat exchanger quickly transfers heat from the boiler system to the domestic water, satisfying DHW load Water connections for easy installation - NPT water connections make installation easy, especially with our optional isolation valves

Delivers both dependable hot water and soothing space heating in a single appliance. With three models ranging from 110000 to 199000 Btu/hr, the NOBLE® combi boiler offers easy installation and serviceability, true instantaneous response time and a user friendly interface. In addition to 10:1 turndown and 95% annual fuel utilization efficiency (AFUE), the NOBLE® fire tube combi boiler is designed, engineered and assembled in the USA.