Universal Gas--------------------------------------------------------------------------------Available Capacities:98,000 BTU/HR. thru 400,000 BTU/HR.Available Warranties:3 year limited tank warranty--------------------------------------------------------------------------------Features:Small jacket diameters Short floor-to-vent heights Multiple Water Connections System Sentinel LED diagnositc system Patented multiflue design Low profile automatic flue damper Spark-to-pilot ignition system Full port, full flow brass drain valve Factory Installed AGA/ASME rated Temperature and Pressure relief valve Stainless steel burners 180 degree max operating temperature Handhole cleanout Stainless steel burners 180ºF max operating temperature LED diagnostics on all damper assemblies for easier service Certified for a 150 PSI maximum working pressure (160 PSI for ASME models) Manual reset high limit (ASME models) Low NOx models available