Canadian Consulting Engineer

New NCB Series Combi-Boilers from Navien deliver plentiful heat and unlimited domestic hot water for larger homes

December 3, 2013
By Canadian Consulting Engineer

IRVINE, Calif. – October, 21, 2013 – Navien introduces the NCB Series combi-boilers: the first condensing combination boilers capable of simultaneously delivering plentiful hydronic heat and unlimited domestic hot water (DHW) for large homes, including those in cold climates. The new NCB Series combi-boilers are uniquely designed for ease of installation and also incorporate a host of features to deliver reliable performance and notable energy cost savings. NCB Series combi-boilers also take up as much as 80 percent less space than a traditional floor-standing boiler and water heater.


NCB Series combi-boilers are offered in three models, the NCB-180, NCB-210 and NCB-240. Maximum heating input for hydronic heating is 80,000 BTU/H, 100,000 BTU/H and 120,000 BTU/H, respectively. Domestic hot water flow rates for each model at 77 Delta T are 3.4 gallons per minute (GPM), 4.0 GPM and 4.5 GPM, respectively – comparable to a stand-alone tankless water heater. The NCB-240 model delivers the highest combined heating capacity and hot water flow rate in the industry.


“The NCB Series combi-boilers represent a whole new category of condensing combination boilers,” says Eric Moffroid, VP Sales and Marketing. “Now contractors and homeowners have a space saving high efficiency condensed combi-boiler large enough to heat a large home, and at the same time, supply it with more than enough domestic hot water for two showers and a dishwasher simultaneously. NCB combi-boilers offer distinct advantages to contractors and customers alike in terms of installation, cost savings and exceptional performance.”


The new NCB Series combi-boilers feature an advanced negative gas pressure valve that results in optimal performance, even under low gas pressure conditions. The dual venturi system allows for easy field convertibility from natural gas to liquid propane operation.


To quickly heat water and also minimize corrosion for extended service life, the NCB Series combi-boilers incorporate the use of dual stainless steel heat exchangers for hydronic heat and a stainless steel flat plate heat exchanger for DHW. The new line of combi-boilers comes with a 10-year warranty on the heat exchangers, a five-year warranty for parts and a one-year warranty for labor.


With capability to use ½-inch gas connections and 2-inch PVC venting, contractors can retrofit the unit in less time than it normally takes with competitive systems. Homeowners will appreciate the compact design that uses far less space than traditional floor-mounted boiler and water heater systems.


Homeowners also benefit from energy savings. The AFUE energy efficiency ratings of up to 93.6 earns an ENERGY STAR® label. 


For more on the NCB Series combi-boilers, visit


About Navien

An official ENERGY STAR® partner, Navien is the recognized leader in Condensing Tankless Technology for water heaters and Combination Gas Boilers. Navien products are available in the United States and Canada through a network of plumbing distributors. For additional information, visit us at


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