C.W.U. 5 BASIC diaphragm vessel – expansion vessel for domestic hot water systems
The IBO C.W.U. 5 BASIC diaphragm vessel is a 5 L expansion vessel designed for domestic hot water systems. It absorbs the thermal expansion of water and stabilizes system pressure, limiting fluctuations and reducing how often the water heater or pump switches on. It contains a replaceable butyl diaphragm designed for contact with domestic 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 adapt to domestic hot water systems.
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Households with a water heater or boiler – the vessel absorbs the increase in hot water volume, limiting pressure fluctuations in the system.
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Domestic water booster systems – the pre-charge pressure of 3.5 bar is suited to systems operating at higher pressure.
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Technical servicing – the replaceable butyl diaphragm, resistant to elevated temperatures, allows the vessel to be restored to working order without replacing the entire unit.
Applications
The C.W.U. 5 BASIC diaphragm vessel absorbs the thermal expansion of water in domestic hot water systems, maintaining stable pressure and limiting fluctuations while water is being heated and drawn.
It is used in domestic and commercial domestic hot water systems, as well as in domestic water booster systems. The butyl diaphragm is suitable for contact with domestic water. The C.W.U. 5 BASIC expansion vessel can be installed vertically or horizontally.
C.W.U. 5 BASIC vessel features – description and technical data
The vessel body is made of steel with an external protective coating that increases corrosion resistance. A replaceable butyl diaphragm is fitted inside the steel shell; it is suitable for contact with potable water and resistant to elevated hot water temperatures. 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: 5 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: 0–100°C
- Installation position: vertical or horizontal
- Dimensions (Ø × height): Ø17 × 28 cm
- Weight: 1.6 kg
IBO – 24-month (2-year) manufacturer’s warranty. Warranty and post-warranty service is provided by Dambat.
Dambat – a trusted manufacturer of pumps and hydrotechnical equipment with quality certificates.
Frequently asked questions (FAQ) – BASIC 5 domestic hot water expansion vessel
What is the BASIC 5 domestic hot water expansion vessel used for?
The IBO BASIC 5 domestic hot water expansion vessel accommodates the thermal expansion of water in a domestic hot water system and stabilizes its pressure. This helps limit pressure fluctuations and reduce how often the heater or pump switches on.
What is the difference between the BASIC domestic hot water vessel and the BASIC central heating 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 BASIC central heating version has an EPDM diaphragm and is intended for closed central heating systems. The two series should 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 BASIC 5 domestic hot water expansion vessel?
The vessel can be installed vertically or horizontally, with a 3/4" connection, in a domestic hot water system. An isolation valve is recommended so it can be serviced without draining the entire system. Check the pre-charge pressure before starting up.
Where can I buy the BASIC 5 domestic hot water expansion vessel?
The manufacturer does not sell directly. The BASIC 5 domestic hot water vessel is available from trade partners, plumbing wholesalers, and authorized online distributors.
What warranty does the BASIC 5 domestic hot water vessel have?
The IBO BASIC 5 domestic hot water expansion vessel comes with a 24-month (2-year) manufacturer’s warranty. Warranty and post-warranty service is provided by Dambat.
