C.O. 12 BASIC diaphragm expansion vessel – expansion vessel for central heating systems
The IBO C.O. 12 BASIC diaphragm expansion vessel is a closed expansion vessel with a capacity of 12 l, designed for central heating systems. It accommodates the thermal expansion of water and stabilizes system pressure, limiting fluctuations as the system heats up and cools down. It contains a replaceable EPDM diaphragm that separates the heating water from the gas cushion.
Who it's for
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Heating system installers – the 3/4" connection and replaceable EPDM diaphragm make installation and subsequent maintenance easier in a closed central heating system.
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Homeowners with a boiler or furnace – the vessel accommodates the increase in water volume as it heats up, maintaining stable system pressure.
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Heating and solar installations – the pre-charge pressure of 1.5 bar is suitable for typical closed-loop systems using heating water or a glycol solution.
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Technical service – the replaceable EPDM diaphragm lets you restore the vessel's functionality without replacing the entire unit.
Applications
The C.O. 12 BASIC expansion vessel accommodates the thermal expansion of water in a closed central heating system, maintaining stable pressure and limiting fluctuations caused by the increase in water volume during heating.
It is used in residential and commercial heating systems, as well as solar systems operating with heating water or a glycol solution. The C.O. 12 BASIC expansion vessel is installed vertically on the system's return side.
Features of the C.O. 12 BASIC vessel – description and technical data
The vessel body is made of steel with a protective exterior coating that increases corrosion resistance. A replaceable diaphragm made of synthetic EPDM rubber, resistant to stretching and elevated temperatures, is housed inside the steel shell. The diaphragm separates the heating medium from the compressed gas cushion, limiting the water's contact with the inside of the body.
The vessel is supplied with a factory pre-charge pressure of 1.5 bar ±10%, which can be adjusted to suit the specific system. It is compatible with closed heating systems with a maximum operating pressure of 8 bar and a medium temperature of up to 99°C.
- Type: diaphragm expansion vessel for central heating
- Brand: IBO
- Capacity: 12 l
- Diaphragm: replaceable, EPDM
- Pre-charge pressure: 1.5 bar ±10%
- Max. operating pressure: 8 bar
- Max. test pressure: 12 bar
- Connection: 3/4"
- Operating temperature: 0–99°C
- Mounting position: vertical
- Dimensions (Ø × height): Ø27 × 31 cm
- Weight: 2.05 kg
IBO – 24-month (2-year) manufacturer's warranty. Dambat provides warranty and post-warranty service.
Dambat – a trusted manufacturer of pumps and hydrotechnical equipment with quality certifications.
Frequently asked questions (FAQ) – C.O. 12 BASIC expansion vessel
What is the C.O. 12 BASIC expansion vessel used for?
The IBO C.O. 12 BASIC expansion vessel accommodates the thermal expansion of water in a closed central heating system and stabilizes its pressure. This helps limit pressure fluctuations that occur as water expands when heated.
What is the difference between the BASIC C.O. vessel and the CWU BASIC version?
The BASIC C.O. vessel is designed for closed central heating systems and operates with heating water. For domestic hot water, there is a separate CWU BASIC series, designed for contact with potable water. The two series must not be used interchangeably.
What is the vessel's pre-charge pressure, and can it be changed?
The factory pre-charge pressure is 1.5 bar ±10%. It can be adjusted to the system's static pressure by adding or releasing gas through the valve on the vessel connection, with the system isolated and depressurized.
How do I install the C.O. 12 BASIC diaphragm expansion vessel?
The vessel is installed vertically, usually on the system return side, using the 3/4" connection. An isolation valve is recommended to allow servicing without draining the entire system, and the pre-charge pressure should be checked before startup.
Where can I buy the C.O. 12 BASIC diaphragm expansion vessel?
The manufacturer does not sell directly. The C.O. 12 BASIC vessel is available from retail partners, plumbing wholesalers and authorized online distributors.
What warranty does the C.O. 12 BASIC vessel come with?
The IBO C.O. 12 BASIC diaphragm expansion vessel comes with a 24-month (2-year) manufacturer's warranty. Warranty and post-warranty service is provided by Dambat.
