Stainless steel heating tube heating body performance is good or bad, material properties is only one aspect, the product performance is good or bad and water quality has a very big relationship. The instant-type electric water heater is heated under the flowing state of water. When the electric water heater is working, the temperature of the outer tube of the heating tube can reach 90°C-120°C. Calcium and magnesium ions in water will begin to precipitate at 60 °C, forming scale. Therefore, stainless steel electric heating bodies in instant electric water heaters also face the problem of fouling.