... boilers have high efficiency in steam cycling and heat exchange. Weilong fully automatic LSS type boiler ... is composed of boiler body, burner, fan, oil pump, gas valve train, safety valves, manometer, thermometer, ... it will burn in the furnace.Most heat transfer to water in the boilers tubes by radiant. ... through the chimney, then exhaust into air.The circling water is added in the lower header. Then ...