Laars introduces the new Mighty Stack volume water heater for light commercial applications. It combines the Mighty Therm 2 boiler with an 80-gallon storage tank, resulting in 199, 300 and 399 MBH sizes fueled by natural or propane gas. Key assets include its small footprint, a removable upper boiler section for easy handling, common venting and up to 50 feet of Category I or III venting. With less than 10 ppm NOx emissions, the sealed-combustion Mighty Stack offers 83% thermal efficiency and meets low-lead requirements. www.laars.com.