The unpressurised solar water heating panel is a simple and more cost-effective system for heating water using solar energy. This type of system does not use pressure to transfer hot water, but relies on the thermosiphon principle, namely that hot water has a lower density than cold water and will therefore rise to the storage tank due to temperature differences.

The unpressurised solar water heating panel has the advantage of not requiring a pump for fluid circulation and therefore incurs no associated running costs. It is also a simple, reliable and durable system, with fewer mechanical components that might require maintenance. The advantages of the unpressurised solar panel system are:

• They are easy to install;
• They require no maintenance;
• They do not use electricity;
• They have very good efficiency;
• They are the most economical solar systems for domestic hot water production;
• The investment pays for itself in a short time;
• They are made from high-quality materials;
• They do not pollute the environment