Solar Expansion Vessel

The expansion vessel in a solar hot water system has to be able to operate at higher temperatures than those a standard heating vessel are subjected to.

Solar expansion vessel. Expansion vessels are an important part and safety device of your solar hot water system. Our solar expansion vessels are rated for a system operation temperature up to 120oc. This rubber bag referred to as a diaphragm contains. Solar expansion vessels need to be sized correctly for your system.

130 c available in sizes 12ltr 18ltr 24ltr 35ltr and 50ltr. An expansion vessel consists of a trapped volume of pressurised air gas inside a steel vessel which contains a rubber bag or diaphragm. The solar expansion tanks has a rubber membrane which separates the solar liquid loop and the other side is filled with pressurized air. As the liquid heats up and expands the pressure of the system increase to an amount greater than the air pressure inside the expansion vessel and causes the membrane to take up more liquid to the air side.

During this period modern solar collectors may reach temperatures up to 200 c and consequently the fluid within the system can either evaporate or reach levels that can damage all the components within the solar energy system over time. Most commonly expansion vessels are 18l or 25l in volume but we have serviced and installed much larger vessels. Eco expansion vessel for solar heating systems.