The thermosiphon valve optimizes the working of the solar heating equipment. It makes installation possible for collectors at the same level of the reservoir, maintaining the natural circulation of water between the collectors and the reservoir.

The Thermosiphon Valve is installed in the water output of the reservoir to the collector, so that, during the day, under the solar incidence, the air circulation is free to be heated. If the temperature drops, or even during the evening, the valve closes the passage of water in the opposite way, hindering the counter-flow. This way, the Thermosiphon Valve avoids the cooling of the water stored in the reservoir.