AERCO International, the leader in fully modulating condensing boilers, introduces the AERCO Esteem 399 wall hung condensing boiler that brings high efficiency and superior reliability to a variety of commercial hot water applications. Continuing the AERCO tradition of leading-edge design, the AERCO Esteem 399 delivers 3.6:1 turndown and 95% efficiency, which helps improve system operation and reduce overall energy consumption in applications requiring 112,000 to 399,000 BTU/hr.

The AERCO Esteem 399 achieves best-in-class performance due to a superior design. A corrosion-resistant 439 stainless steel fire tube heat exchanger makes the boiler well suited for today’s efficient, condensing hydronic heating systems. Thermal efficiency is maximized by the heat exchanger tube design, which creates flue gas and water turbulence.

A premix air/fuel blower and high-grade stainless steel burner capable of modulating the firing rate from 28% to 100% allow the AERCO Esteem 399 to closely match heating needs without short cycling or reducing efficiency. The burner features whisper quiet operation of <50 dBa and reliable spark ignition.  

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