An indirect system relies on a heat transfer fluid (Glycol) for thermal transfer. In an indirect system the water in the tank and the glycol do not come into contact. The glycol circulates through the solar collector absorbing heat energy, which is then transferred using a thermosiphon process to a heat exchanger in the solar geyser, which in turn heats the water.
Indirect systems are:
- Highly efficient.
- Easy to install.
- Requires very little maintenance.
- Is the most popular solar system internationally.
- Can be installed in all areas.