These systems have many advantages:

• They can use simple water as a solar fluid for lower cost.
• They are very efficient if they are planned and installed properly.
• They are ideal where the installation will lie idle for extended periods.
• Since the system empties when it switches off, the solar fluid has a long life.

It's also important to consider these disadvantages:

• They cannot be used in regions with harsh winters.
• They cannot be used where freezes occur regularly.
• They cannot be used where there is significant snowfall.
• Pipe runs must be installed for quick and complete drainage.
• The collectors must be above the storage tank.
• High-head pumps use more electricity.
• Material and installation requirements are more complex.