Expansion vessels for solar systems

Expansion vessels for solar systems - a key element of the installation

Expansion vessels are an essential component of every solar installation.   Their role is to compensate for changes in the volume of the heating medium. These changes result from temperature fluctuations in the system. At Onninen we offer a wide range of expansion vessels for solar systems. Our range includes products from renowned brands.

In our daily practice, we encounter various customer requirements. That is why our offer includes expansion vessels with various parameters. Models are available with capacities from a few to several hundred liters. The operating pressure is another important parameter when selecting. We offer vessels adapted to pressures from 3 to 10 bar.

Types of expansion tanks for solar systems

Our range includes two main types of expansion tanks:

• Membrane vessels
• Expansion vessels

Membrane vessels have a flexible membrane separating the working fluid from the gas. Expansion vessels have a more durable membrane. The selection of the appropriate type depends on the specifics of the installation and design requirements.

Onninen's product range includes products from renowned brands such as Global Water, Reflex and Flamco Meibes. Each of these companies specialises in the production of high-quality expansion vessels. This means that our customers can be sure that they are receiving proven solutions.

Criteria for selecting expansion vessels for solar systems

The correct selection of the expansion tank is crucial to the efficiency of the system. When choosing one, there are several important factors to consider:

• Solar installation capacity
• Maximum operating temperature
• Preliminary and final pressure in the installation
• Location of the vessel in the system

Our experience shows that the capacity of the vessel is often underestimated. This can lead to problems with the operation of the installation. Therefore, we always advise selecting a vessel with a certain reserve of volume.

In practice, we encounter various challenges when selecting expansion vessels. Recently, in a project for a large office complex, we had to use an unusual solution. Due to limited technical space, we decided on a cascade system. We used several smaller vessels connected in series.

In addition to standard expansion vessels, our offer also includes accessories. These include connecting pipes and safety valves. These elements ensure correct installation and functioning of expansion vessels in the system.

Expansion vessels for solar systems - technical aspects

Pressure expansion vessels are the most advanced type of expansion vessels.   Their design ensures long-term and failure-free operation. The diaphragm is made of high-quality elastomer. This material is resistant to high temperatures and aggressive media.

In solar systems, resistance to glycol is important. It is often used as a working medium. The vessels from our offer are fully compatible with glycol solutions. This ensures the safety and durability of the entire installation.

We often come across the question about the durability of expansion tanks. Our experience shows that with proper selection and use, they can last up to 15-20 years. However, regular checking of the initial pressure is crucial. We recommend carrying out such checks at least once a year.

In the case of larger solar installations, concrete settling tanks are used. They are used for preliminary cleaning of the working medium. This extends the life of the entire system, including the expansion tanks.

Onninen recommends using expansion tanks with an additional inspection port. This makes it easier to check the condition of the membrane or diaphragm without having to dismantle the vessel. This solution is particularly useful in large industrial installations.

Many customers ask us about the possibility of installing expansion tanks themselves. We always recommend that a qualified specialist performs the installation. This ensures the correct positioning and connection of the tank in the system.

In our daily practice, we see how important it is to properly operate expansion tanks. Regular inspections and maintenance are key to long-term operation of the system. We offer our customers full support in the field of service and maintenance.

Expansion vessels for solar systems are not just a technical element.   This is a guarantee of the safety and efficiency of the entire installation. That is why it is so important that they are selected and installed by professionals. At Onninen, we provide not only the highest quality products, but also expert advice.

We invite you to contact our specialists. We will help you choose the optimal solution for each solar installation. Our experience and wide product range allow us to meet even the most demanding projects.