In boilers, China wholesale boiler economizers are heat exchange devices that heat fluids, usually water, up to but not normally beyond the boiling point of that fluid. Economizers are so named because they can make use of the enthalpy in fluid streams that are hot, but not hot enough to be used in a boiler, thereby recovering more useful enthalpy and improving the boiler's efficiency. They are a device fitted to a boiler which saves energy by using the exhaust gases from the boiler to preheat the cold water used to fill it (thefeed water). 1. newly designed economizer with higher efficiency. 2. cast iron material which could resisit for higher temperature. 3. take fully use of the exhause heat from the boiler, increase the feeding water temperature, which could help to imporve the boiler efficiency. 4. with long working life. 5. capacity range from 0.5t till to 40t.