HANGING TYPE HEATING|HOT WATER MULTIPURPOSE GAS FURNACE(VOLUME TYPE) HANGING TYPE SEMICONDUCTOR ELECTRONIC MULTIPURPOSE FURNACE HANGING TYPE HEATING|HOT WATER MULTIPURPOSE GAS FURNACE(QUICK HEATING TYPE) FULL AUTOMATIC VERTICAL TYPE FUEL (GAS) BOILER FULL AUTOMATIC HORIZONTAL TYPE FUEL (GAS) BOILER WATER FIRE TUBE BOILER SHELL TYPE COAL-FIRED BOILER VERTICAL SINGLE-SLOTTED NORMAL BURNING DOUBLE BURNING CHAMBER COAL-FIRED BOILER VERTICAL FUEL(GAS) STEAM BOILER COAL-FIRED HEAT-CONDUCTING OIL BOILER ELECTRIC HEATING BOILER