C.W.U 50 BASIC diaphragm expansion vessel – expansion vessel for domestic hot water systems
The IBO C.W.U 50 BASIC diaphragm expansion vessel is a 50 l expansion vessel designed for domestic hot water systems. It accommodates 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 easier to adapt to domestic hot water systems.
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Households with a water heater or boiler – the vessel accommodates the increase in hot water volume, limiting pressure fluctuations in the system.
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Domestic water pressure systems – the 3.5 bar pre-charge pressure 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 50 BASIC diaphragm expansion vessel accommodates the thermal expansion of water in a domestic hot water system, maintaining stable pressure and limiting fluctuations during water heating and draw-off.
It is suitable for domestic and commercial domestic hot water systems, as well as domestic water pressure systems. The butyl diaphragm is designed for contact with domestic water. The C.W.U 50 BASIC expansion vessel can be installed vertically or horizontally.
Features of the C.W.U 50 BASIC vessel – description and technical data
The vessel body is made of steel coated with a protective exterior finish that increases corrosion resistance. Inside the steel shell is a replaceable butyl diaphragm, designed for contact with domestic 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.
The vessel is supplied with a factory pre-charge pressure of 3.5 bar ±10%, which can be adjusted to suit the specific installation. 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: 50 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): Ø35 × 55 cm
- Weight: 7.6 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 certifications.
Frequently asked questions (FAQ) – 50 BASIC DHW expansion vessel
What is the 50 BASIC DHW expansion vessel used for?
The IBO 50 BASIC DHW expansion vessel accommodates the thermal expansion of water in a domestic hot water system and stabilizes its pressure. This helps reduce pressure fluctuations and how often the water heater or pump switches on.
How does the BASIC DHW vessel differ from the BASIC CH version?
The BASIC DHW vessel is designed for domestic hot water systems and has a butyl diaphragm suitable for contact with potable water. The BASIC CH version has an EPDM diaphragm and is designed 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 50 BASIC DHW expansion 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. Check the pre-charge pressure before startup.
Where can I buy the 50 BASIC DHW expansion vessel?
The manufacturer does not sell directly. The 50 BASIC DHW expansion vessel is available from trade partners, plumbing wholesalers and authorized online distributors.
What is the warranty on the 50 BASIC DHW expansion vessel?
The IBO 50 BASIC DHW expansion vessel comes with a 24-month (2-year) manufacturer's warranty. Warranty and post-warranty service is provided by Dambat.
