Central Heating Central System Boiler YTPY3G (232-2326 KW) Central System Boiler YTPY3G-K (232-1160 KW) 4-Pass-Stoker Fired Heating Boiler YTP4G (116-581 KW) Natural Gas Fired and Liquid Fuel Heating Boiler YT3G (116-931 KW) Solid Fuel Central System Heating Boiler YTKY3G (232-930 KW)