36 BASIC DHW expansion vessel – an expansion vessel for domestic hot water systems
The IBO 36 BASIC DHW expansion vessel has a capacity of 36 l and is 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 features a replaceable butyl diaphragm designed for contact with potable water and elevated temperatures.
Who it's for
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Plumbing and domestic hot water (DHW) installers – the 3/4" connection, butyl diaphragm and vertical or horizontal mounting make it easy to fit into DHW systems.
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Households with a water heater or boiler – the vessel accommodates the increased volume of hot water, limiting 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 pressure.
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Technical service – the replaceable butyl diaphragm, resistant to elevated temperatures, allows the vessel to be restored to working order without replacing the entire unit.
Applications
The BASIC 36 Domestic Hot Water expansion vessel absorbs the thermal expansion of water in a domestic hot water system, maintaining stable pressure and limiting fluctuations as water is heated and drawn 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 BASIC 36 Domestic Hot Water expansion vessel can be installed vertically or horizontally.
Features of the BASIC 36 Domestic Hot Water vessel – description and technical specifications
The vessel body is made of steel coated with a protective exterior paint 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 the elevated temperatures of hot water. The diaphragm separates the water from the compressed gas cushion, limiting its contact with the inside of the 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: 36 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 × 46 cm
- Weight: 6.4 kg
IBO – 24-month (2-year) manufacturer's warranty. Warranty and post-warranty service provided by Dambat.
Dambat – a trusted manufacturer of pumps and water engineering equipment with quality certificates.
Frequently asked questions (FAQ) – BASIC 36 Domestic Hot Water expansion vessel
What is the BASIC 36 Domestic Hot Water expansion vessel used for?
The IBO BASIC 36 Domestic Hot Water vessel absorbs the thermal expansion of water in a domestic hot water system and stabilizes the pressure. This limits pressure fluctuations and reduces how often the water heater or pump in the system switches on.
How does the BASIC Domestic Hot Water vessel differ from 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 designed for closed central heating systems. The two series are not interchangeable.
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 vessel’s valve, with the system isolated and depressurized.
How do I install the C.W.U. 36 BASIC diaphragm expansion vessel?
The vessel can be installed vertically or horizontally, using a 3/4" connection, in a domestic hot water system. An isolation valve is recommended to allow servicing without draining the entire system, and the pre-charge pressure should be checked before start-up.
Where can I buy the C.W.U. 36 BASIC diaphragm expansion vessel?
The manufacturer does not sell directly. The C.W.U. 36 BASIC expansion vessel is available from retail partners, plumbing wholesalers, and authorized online distributors.
What is the warranty on the C.W.U. 36 BASIC expansion vessel?
The IBO C.W.U. 36 BASIC diaphragm expansion vessel comes with a 24-month (2-year) manufacturer’s warranty. Dambat provides warranty and post-warranty service.
