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The Navien NFB-399C is a high-efficiency condensing heating boiler designed for indoor residential and commercial use. With a maximum heating input of 399,000 BTU/h, this wall-hung boiler offers reliable and efficient heating solutions. It is suitable for various applications, ensuring consistent performance without sacrificing comfort.
This boiler features advanced controls with an intuitive seven-inch color display, making it user-friendly for technicians. The patented stainless steel fire tube heat exchanger provides durability and efficiency, while the unit supports direct or power venting options.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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