The new KNIGHT XL Commercial Boiler from Lochinvar is a modulating/condensing unit with 94.6 percent thermal efficiency, low NOx emissions and a fully modulating burner with 5:1 turndown. Also, because the boiler has high inputs and can be sequenced with multiple boilers to meet demand, it is suited for multifamily applications.Available in five models with 399,000, 500,000, 600,000, 700,000 and 800,000 Btu/hr inputs, the KNIGHT XL is lightweight and easy to handle. The units also feature a small footprint for space-saving versatility and zero clearance to combustible materials. Engineered with Lochinvar’s Smart System control, the KNIGHT XL offers control and monitoring functions that are easy to use. The two-line, 16-character LCD display uses words instead of potentially confusing codes to communicate with the technician.In addition, the Smart System operating control includes a built-in cascading sequencer for the installation of up to eight KNIGHT XL units, delivering up to 6.4 million Btu/hr heating capacity.The KNIGHT XL allows fully modulating combustion with 5:1 turndown. The stainless steel burner can fire as low as 20 percent of maximum input and modulates up to 100 percent as demand increases, allowing the boiler to generate the appropriate amount of heat to provide a consistent, stable indoor temperature. Since the KNIGHT XL is able to adjust heat output according to demand, fuel use is kept to a minimum.  Many of KNIGHT XL’s features can also make it a “green choice” for environmentally focused projects. www.lochinvar.com