These systems have three major advantages:
- They are relatively very simple and easy to install.
- The lack of complex parts makes them very easy to maintain.
- They are the cheapest of the solar thermal installations.
It's also important to consider the disadvantages:
- They cannot be used where freezes occur.
- They are very heavy and can only be roof-installed on buildings that can support the weight.
- They may require a change in hot water usage habits to get the best return on investment.