The Navien NHB is a condensing gas boiler with an efficiency rating of 95.0% AFUE. It was named an Energy Star Most Efficient 2016 product and is available in four models: NHB-55, NHB-80, NHB-110, and NHB-150. The NHB is a wall-hung boiler, designed to occupy far less space than a traditional floor-standing boiler. It can be vented with 2" and 3" PVC, CPVC and approved polypropylene, with venting up to 60 feet using 2" PVC, and up to 16 units of the two largest models, the 110 and 150, can be cascaded. An optional NaviLink control allows remote temperature control and monitoring.
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