Nowadays, non-pressurized solar water heater is very popular in many countries and area, such as India, Mexico, Vietnam, China, Chile....etc.  
 
Features and advantages:
1. High efficiency and economical system.
2. Suitable for projects and home use.
3. Designed for commercial solar water heating applications.
4. Reliable and efficient with twin-glass solar tubes.
5. Polyurethane insulation ensures a good heating performance and minimal heat loss.
6. Easy plug-in installation.
7. Can be connected in series to increase water heating capacity.