Navien Boiler Sizing. Size + − single (39.4 x 76.8) queen (57 x 76.8) king (65 x 76.8) clear add to cart product. At navien, we have a wide choice of high efficiency condensing gas boilers to suit all styles of.
What size boiler do you currently have? All navien combi boilers are oversized for your heating load, but at the. The right size boiler navien 60,000 or 80,000.