Good heat resistance, dry burning resistance, mature technology, and low cost. At present, there are many types of stainless steel heating pipes used by various instant heating electric water heater manufacturers, and the price difference between various pipes is large. The quality and performance of electric heating pipes made of stainless steel also differ greatly. The main difference between the quality of stainless steel electric heating pipes is the difference in nickel content. Nickel is an excellent corrosion-resistant material, and when combined with chromium in stainless steel, the corrosion resistance and process performance of stainless steel are improved to some extent. But the nickel content needs to reach 24%, and only when the nickel content is 27% can the corrosion resistance of steel in certain media be significantly changed. The disadvantage is that there are certain requirements for water quality. Direct steam humidifiers are also commonly referred to as pure humidifiers. Pure humidification technology is a new technology that has just been adopted in the field of humidification. Pure humidifiers use molecular sieve evaporation technology to remove calcium and magnesium ions from water, completely solving the problem of "white powder". Wash the air through a water curtain, humidify the air while purifying it, and then send the moist and clean air indoors through a pneumatic device, thereby increasing environmental humidity. At the same time, the new humidifier is not limited by water quality; The filter evaporator is made of imported single fiber, which can filter air and kill bacteria, making humidification more pure; Equipped with an air circulation system, while humidifying, the air is washed with clean water, effectively eliminating pollution in the air, purifying the air, promoting indoor air circulation, and ensuring human health to a greater extent. A hot steam type humidifier is also known as an electric heating tube humidifier. Its working principle is to heat water in a heating body to 100 degrees, generate steam, and use an electric motor to send the steam out. So electric heating humidifier is the simplest humidification method in technology, but its disadvantages are high energy consumption, inability to dry burn, low safety factor, and easy scaling on the heater.