Cold water heater, ensure clean drinking water supplies.
清洁冷热水器，保证饮用水供应。
2
This paper describes mechanical cleaning in place of chemical cleaning to clean the scale in vacuum salt making pre-heater with good results in practical application.
本文简述采用机械清洗方法替代化学清洗方法清洗真空制盐预热器中垢层。并在实际应用中取得良好效果。
3
The solar energy water heater has both the energy saving, safe, convenient, public health and other characteristics, and have "clean, efficient and environmentally friendly of reputation".