In addition to contemporary designs and styling finishes, Mahmoud also sought the latest in boiler technology to heat a new development.

These vertical fire-tube modulating condensing boilers feature stainless steel, vertical fire-tube construction.

By limiting turndown to 5:1, Patterson-Kelley can maintain the dewpoint as high as possible, which allows for greater condensation.

The boilers utilize a hydrophobic-coated, finned stainless steel heat exchanger to work in concert with the existing high-efficiency cast-iron heat exchanger.

The CREST modulating-condensing boiler features six models ranging from 750,000 to 2 million Btuh, optimized for outdoor commercial installations.

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.