The natural gas or LP-fired Mascot LX condensing combination boiler and tankless water heater from Laars Heating Systems offers an AHRI-certified 95 percent AFUE efficiency, full modulation and a plentiful supply of domestic hot water. It is available in 10 models to meet the demands of any size home or small business and includes an easy-to-use advanced control system with auto-cascade setup for multiple boiler installations, outdoor reset, primeless condensate trap, zero-clearance installation and venting up to 150 feet. 800/900-9276; www.laars.com.