BASIC domestic hot water expansion vessel 12 – expansion vessel for domestic hot water systems
The IBO BASIC 12 domestic hot water expansion vessel is a 12 L expansion vessel designed for domestic hot water systems. It accommodates the thermal expansion of water and stabilizes system pressure, reducing pressure fluctuations and how often the water heater or pump switches on. It has a replaceable butyl diaphragm designed for contact with potable water and elevated temperatures.
Who it's for
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Water and domestic hot water system installers – the 3/4" connection, butyl diaphragm and vertical or horizontal installation make it easy to fit into a domestic hot water system.
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Households with an electric water heater or hot water tank – the vessel accommodates the increase in hot water volume, reducing pressure fluctuations in the system.
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Domestic water pressure systems – a pre-charge pressure of 3.5 bar is suitable for systems operating at higher pressures.
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Technical service – the replaceable butyl diaphragm, resistant to elevated temperatures, lets you restore the vessel’s functionality without replacing the entire unit.
Applications
The C.W.U. 12 BASIC diaphragm vessel absorbs the thermal expansion of water in a domestic hot water system, maintaining stable pressure and limiting pressure fluctuations during water heating and draw-off.
It is used in domestic and commercial domestic hot water systems, as well as in domestic water pressure systems. The butyl diaphragm is suitable for contact with potable water. The C.W.U. 12 BASIC expansion vessel can be installed vertically or horizontally.
C.W.U. 12 BASIC vessel features – description and technical data
The vessel body is made of steel coated with an external protective paint to increase corrosion resistance. Inside the steel shell is a replaceable butyl diaphragm, suitable for contact with potable water and resistant to the elevated temperatures of hot water. The diaphragm separates the water from the compressed gas cushion, limiting its contact with the inside of the vessel body.
The vessel is supplied with a factory pre-charge pressure of 3.5 bar ±10%, which can be adjusted to suit the specific system. It is compatible with domestic hot water systems with a maximum operating pressure of 10 bar.
- Type: diaphragm expansion vessel for domestic hot water
- Brand: IBO
- Capacity: 12 l
- Diaphragm: replaceable, butyl
- Pre-charge pressure: 3.5 bar ±10%
- Max. operating pressure: 10 bar
- Max. test pressure: 15 bar
- Connection: 3/4"
- Operating temperature: 0–99°C
- Installation position: vertical or horizontal
- Dimensions (Ø × height): Ø28 × 31 cm
- Weight: 2.8 kg
IBO – 24-month (2-year) manufacturer’s warranty. Warranty and post-warranty service provided by Dambat.
Dambat – a trusted manufacturer of pumps and hydrotechnical equipment with quality certifications.
Frequently asked questions (FAQ) – C.W.U. 12 BASIC diaphragm vessel
What is the C.W.U. 12 BASIC diaphragm vessel used for?
The IBO C.W.U. 12 BASIC domestic hot water vessel absorbs the thermal expansion of water in a domestic hot water system and stabilizes the pressure. This reduces pressure fluctuations and how often the heater or pump in the system switches on.
What is the difference between the BASIC domestic hot water vessel and the CO BASIC version?
The BASIC domestic hot water vessel is designed for domestic hot water systems and has a butyl diaphragm suitable for contact with potable water. The CO BASIC version has an EPDM diaphragm and is designed for closed central heating systems. 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 3.5 bar ±10%. It can be adjusted to match the system 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.W.U. 12 BASIC diaphragm vessel?
The vessel can be installed vertically or horizontally, using the 3/4" connection, in a domestic hot water system. An isolation valve is recommended to allow servicing without draining the entire system, as is checking the pre-charge pressure before startup.
Where can I buy the C.W.U. 12 BASIC diaphragm vessel?
The manufacturer does not sell directly. The C.W.U. 12 BASIC vessel is available from trade partners, plumbing wholesalers, and authorized online distributors.
What is the warranty on the C.W.U. 12 BASIC vessel?
The IBO C.W.U. 12 BASIC diaphragm vessel comes with a 24-month (2-year) manufacturer's warranty. Dambat provides warranty and post-warranty service.
