2. Secondly, open the water inlet pipe of the small warm air tank and insert the mouth of the high-pressure air pump into the water inlet pipe of the small warm air tank.
3. Finally, turn on the air pump, and high-pressure air will blow into the whole circulating waterway, including of course the heating water tank pipeline. With the entry of high-pressure air, the dirty water remaining in the cylinder will also be blown out. Add detergent and fill the water tank with tap water.