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The boilers utilize a hydrophobic-coated, finned stainless steel heat exchanger to work in concert with the existing high-efficiency cast-iron heat exchanger.
On Jan. 25, with dignitaries and VIP guests present, Navien held a celebration of this accomplishment for all employees. Congratulations and toasts of appreciation contributed to the event.
The Aspen and Aspen Light commercial condensing boilers feature a 10:1 turndown ratio, efficiencies of up to 96 percent AFUE, and boast low emissions. With a stainless steel, vertical, firetube heat exchanger, the Aspen line includes seven sizes between 85-399 MBtuh, with a 155-MBtuh combi unit available.
The Free Flex Ultra-High Efficiency Commercial Condensing Boiler offers a thermal efficiency of 95 percent and features Bryan’s weld-free design. The Free Flex permits field access to the heat exchanger for cleaning and an unprecedented tube replacement.
The ClearFire-CE (CFC-E) condensing boiler can achieve up to 99 percent efficiency due to its enhanced AluFer® firetube heat exchanger and dual temperature returns.
Early last year, the U.S. Department of Energy (DOE) issued a final rule amending the minimum efficiency standards for residential boilers, which will go into effect Jan. 15, 2021. In addition, the DOE amended its test procedure for residential boilers.
For large residential or light commercial applications requiring a multiple boiler setup, the Evergreen provides ZoneStacking™— the capability to operate 24 zones without an additional external third-party control.