NFB-200H - Condensing Heating Boiler - 199,000 BTUNavien NFB 200H Condensing Heating Boiler 199,000 BTU The Navien NFB 200H is a high efficiency condensing heating boiler designed for residential and light commercial applications. Rated at 95% AFUE and Energy Star certified, it delivers up to 199,900 BTU hr input with a DOE heating capacity of 183,000 BTU hr. The boiler features a 15: 1 turndown ratio for precise load matching and energy savings. Its patented stainless steel fire tube heat exchanger
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