New steel heat exchangers are commonly used in home renovations in the North now.Anti-corrosion is the highlight of the heat exchanger market this year. In fact, heat exchangers have anti-corrosion problems. If the ordinary steel heat exchanger is not treated with anti-corrosion treatment, it is afraid of oxidative corrosion. When it is warmed up, it must be filled with water to prevent air from entering; while aluminum is afraid of alkaline water corrosion. Generally speaking, copper heat exchanger has better corrosion resistance than steel, but under certain circumstances, copper heat exchangers will also corrode, such as if there is sludge in the system, excessive sulfur content, or carbon surface on the selected copper surface will cause corrosion of copper heat exchangers.