Open Loop

The simplest of all direct systems is the open loop Thermosyphon Solar Water Heater. These systems operate on a very simple principle – water is circulated by natural convection and gravity – rising and falling in response to solar heat, just as air does. In their simplest form, open loop Thermosyphon Solar Systems are perfect for non-freezing areas.

A direct pump system is often used for flexibility in the system layout and design. With this forced circulation, the tank does not need to be placed above, or even near, the solar collectors. In this system, the pump moves water through the collectors only when there is enough solar radiation to provide useful heat.


Some Areas or Graphics Reprinted with Permission: Silicon Solar Inc,  Copyright 2008-2009 All Rights Reserved  DogStar Solar Inc, Copyright 2009

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