Heating boilers ideal for residential and light commercial use

The Navien Heating Boiler (NHB) series is ideal for residential and light commercial use, according to Navien. NHBs will be offered in four models: NHB-55, NHB-80, NHB-110 and NHB-150, with respective turndown ratios of 7-to-1, 10-to-1, 11-to-1 and 15-to-1. The 15-to-1 turndown ratio in the NHB-150 is achieved with Navien’s advanced burner system, the company says. One component that helps to achieve that efficiency is a dual Venturi gas delivery system. Options and features available in the series are timed hydronic supply water boost; adjustable heat capacity; an adjustable anti-cycle timer; freeze protection; an adjustable minimum burner time setting; and adjustable turndown ratio timing.