Description
IBO ITALY 19 L DHW diaphragm vessel – expansion vessel for domestic hot water systems
The IBO ITALY 19 L DHW diaphragm vessel is a 19 L expansion vessel designed for domestic hot water systems. It accommodates the thermal expansion of water and stabilizes system pressure, reducing fluctuations and how often the water heater or pump switches on. It contains a butyl diaphragm suitable for contact with domestic water and elevated temperatures.
Who it’s for
- Water system installers and D.W.H. installers – the 3/4" connection, butyl diaphragm, and vertical or horizontal installation make it easy to fit into domestic hot water systems.
- Households with a water heater or boiler – the vessel accommodates the increase in hot water volume, reducing pressure fluctuations in the system.
- Systems operating over a wider temperature range – designed for temperatures from −10 to 100°C, it serves domestic hot water systems under varying operating conditions.
- Technical service – the butyl diaphragm’s resistance to elevated temperatures reduces maintenance requirements.
Applications
The IBO ITALY 19 L DHW diaphragm vessel accommodates the thermal expansion of water in domestic hot water systems, maintaining stable pressure and reducing fluctuations while water is heated and drawn.
It is used in domestic and commercial domestic hot water systems, as well as in domestic water pressure booster systems. The butyl diaphragm is suitable for contact with domestic water. The IBO ITALY 19 L DHW diaphragm vessel can be installed vertically or horizontally.
Features of the IBO ITALY 19 L domestic hot water diaphragm expansion vessel – description and technical data
The vessel body is made of steel coated with an exterior protective lacquer to improve corrosion resistance. A butyl diaphragm, suitable for contact with domestic water and resistant to the elevated temperatures of hot water, is fitted inside the steel shell. 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 system. It is compatible with domestic hot water systems with a maximum operating pressure of 10 bar and a temperature range of −10 to 100°C.
- Type: diaphragm expansion vessel for domestic hot water
- Brand: IBO ITALY
- Capacity: 19 L
- Diaphragm: butyl
- Pre-charge pressure: 3.5 bar ±10%
- Max. operating pressure: 10 bar
- Max. test pressure: 15 bar
- Connection: 3/4"
- Operating temperature: from −10 to 100°C
- Installation position: vertical or horizontal
- Dimensions (Ø × height): Ø30 × 36.5 cm
- Weight: 3.5 kg
IBO ITALY – 36-month (3-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) – IBO ITALY 19 L domestic hot water diaphragm expansion vessel
What is the IBO ITALY 19 L domestic hot water diaphragm expansion vessel used for?
The IBO ITALY 19 L domestic hot water diaphragm 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 water heater or pump switches on.
What is the difference between the IBO ITALY domestic hot water vessel and the C.W.U. BASIC version?
The IBO ITALY domestic hot water vessel operates across a wider temperature range (from −10°C) and comes with a 36-month warranty. The C.W.U. BASIC version comes with a 24-month warranty. Both series have a butyl diaphragm and are designed for domestic hot water systems.
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 IBO ITALY 19 L domestic hot water diaphragm 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 to allow servicing without draining the entire system, along with a check of the pre-charge pressure before commissioning.
Where can I buy the IBO ITALY 19 L domestic hot water diaphragm expansion vessel?
The manufacturer does not sell directly. The IBO ITALY 19 L domestic hot water diaphragm expansion vessel is available from commercial partners, plumbing wholesalers, and authorized online distributors.
What warranty does the CWU 19 IBO ITALY diaphragm vessel have?
The CWU 19 IBO ITALY diaphragm vessel comes with a 36-month (3-year) manufacturer's warranty. Warranty and post-warranty service is provided by Dambat.
- Diaphragm: YES,
- Installation position: Vertical/Horizontal,
- Connection: 3/4",
- Pressure gauge: NO,
- Maximum tested pressure: 15.0 bar,
- Pre-charge pressure: 3.5 ±10%,
- Operating pressure: 10.0 bar,
- Operating temperature: from 0°C to 100°C,
- Dimensions: Ø30/36.5 cm,
- Weight: 3.5 kg,
MATERIALS
• Body: Carbon steel with a lacquer coating,
• Flange: Galvanized steel
• Diaphragm: EPDM (Italian).
IBO ITALY 19 L DHW diaphragm vessel – expansion vessel for domestic hot water systems
The IBO ITALY 19 L DHW diaphragm vessel is a 19 L expansion vessel designed for domestic hot water systems. It accommodates the thermal expansion of water and stabilizes system pressure, reducing fluctuations and how often the water heater or pump switches on. It contains a butyl diaphragm suitable for contact with domestic water and elevated temperatures.
Who it’s for
- Water system installers and D.W.H. installers – the 3/4" connection, butyl diaphragm, and vertical or horizontal installation make it easy to fit into domestic hot water systems.
- Households with a water heater or boiler – the vessel accommodates the increase in hot water volume, reducing pressure fluctuations in the system.
- Systems operating over a wider temperature range – designed for temperatures from −10 to 100°C, it serves domestic hot water systems under varying operating conditions.
- Technical service – the butyl diaphragm’s resistance to elevated temperatures reduces maintenance requirements.
Applications
The IBO ITALY 19 L DHW diaphragm vessel accommodates the thermal expansion of water in domestic hot water systems, maintaining stable pressure and reducing fluctuations while water is heated and drawn.
It is used in domestic and commercial domestic hot water systems, as well as in domestic water pressure booster systems. The butyl diaphragm is suitable for contact with domestic water. The IBO ITALY 19 L DHW diaphragm vessel can be installed vertically or horizontally.
Features of the IBO ITALY 19 L domestic hot water diaphragm expansion vessel – description and technical data
The vessel body is made of steel coated with an exterior protective lacquer to improve corrosion resistance. A butyl diaphragm, suitable for contact with domestic water and resistant to the elevated temperatures of hot water, is fitted inside the steel shell. 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 system. It is compatible with domestic hot water systems with a maximum operating pressure of 10 bar and a temperature range of −10 to 100°C.
- Type: diaphragm expansion vessel for domestic hot water
- Brand: IBO ITALY
- Capacity: 19 L
- Diaphragm: butyl
- Pre-charge pressure: 3.5 bar ±10%
- Max. operating pressure: 10 bar
- Max. test pressure: 15 bar
- Connection: 3/4"
- Operating temperature: from −10 to 100°C
- Installation position: vertical or horizontal
- Dimensions (Ø × height): Ø30 × 36.5 cm
- Weight: 3.5 kg
IBO ITALY – 36-month (3-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) – IBO ITALY 19 L domestic hot water diaphragm expansion vessel
What is the IBO ITALY 19 L domestic hot water diaphragm expansion vessel used for?
The IBO ITALY 19 L domestic hot water diaphragm 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 water heater or pump switches on.
What is the difference between the IBO ITALY domestic hot water vessel and the C.W.U. BASIC version?
The IBO ITALY domestic hot water vessel operates across a wider temperature range (from −10°C) and comes with a 36-month warranty. The C.W.U. BASIC version comes with a 24-month warranty. Both series have a butyl diaphragm and are designed for domestic hot water systems.
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 IBO ITALY 19 L domestic hot water diaphragm 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 to allow servicing without draining the entire system, along with a check of the pre-charge pressure before commissioning.
Where can I buy the IBO ITALY 19 L domestic hot water diaphragm expansion vessel?
The manufacturer does not sell directly. The IBO ITALY 19 L domestic hot water diaphragm expansion vessel is available from commercial partners, plumbing wholesalers, and authorized online distributors.
What warranty does the CWU 19 IBO ITALY diaphragm vessel have?
The CWU 19 IBO ITALY diaphragm vessel comes with a 36-month (3-year) manufacturer's warranty. Warranty and post-warranty service is provided by Dambat.


