Description
5 BASIC Domestic Hot Water Expansion Vessel
IBO C.W.U. BASIC expansion vessels are tanks designed for hot and cold water installations, used to maintain and equalize pressure resulting from changes in water volume. As the manufacturer, we design the C.W.U. BASIC series with a butyl membrane and a carbon steel body coated with epoxy paint, ensuring durable and reliable operation in water installations. The series is available in capacities from 5 to 50 liters.
Who it is for
- Water and sewer installation companies – we supply proven, ready-to-install components for hot and cold water installations, with complete Dambat technical documentation.
- Sanitary installation designers – we offer vessels with documented pressure and capacity parameters, facilitating system selection and planning.
- Wholesalers and technical stores – we enable you to expand your offering with an economical series of C.W.U. expansion vessels available in a wide range of capacities.
- Service technicians and maintenance departments – we provide vessels covered by a 24-month manufacturer’s warranty and supported by Dambat authorized service.
Applications
- Maintaining and equalizing pressure in hot and cold water installations – compensating for changes in water volume resulting from heating.
- Operation in installations filled with glycol mixtures at a maximum concentration of 50%.
- Protecting water systems in residential buildings, commercial facilities, and industrial installations.
- Working with pumps and pressure systems requiring certified devices compliant with Directive 2014/68/EU.
Features, description, and technical data
The IBO C.W.U. BASIC series from Dambat includes expansion vessels for hot and cold water installations, available in capacities from 5 to 50 liters. High-quality materials and quality control at every stage of production ensure consistent parameters and long-lasting operation.
The vessel body is made of thick carbon steel coated with anti-corrosion lacquer and an external powder epoxy coating, guaranteeing durable surface protection. A butyl membrane is installed inside the steel shell. Butyl is characterized by high tensile strength and very low gas permeability. The membrane completely separates the water from the compressed air cushion, protecting the steel body against internal corrosion.
A sealed valve (car tire valve) is located at the rear of the vessel, under the cover, and is used to check and adjust the pre-charge pressure with a standard compressor. The vessels meet the requirements of Pressure Directive 2014/68/EU.
Parameters of the IBO C.W.U. BASIC series:
- Diaphragm: YES – butyl
- Gas permeability: very low
- Body: carbon steel coated with anti-corrosion lacquer and powder epoxy paint
- Compliance: PED 2014/68/EU Pressure Directive
- Approved media: water, glycol mixtures with a concentration of up to 50%
Detailed technical data for individual models (pre-charge pressure, operating pressure, dimensions, and weight) are available in the manufacturer’s technical documentation. Warranty: IBO – 24-month (2-year) manufacturer’s warranty. Dambat is the only authorized service provider.
Frequently Asked Questions (FAQ) – IBO C.W.U. BASIC expansion vessels
What are IBO C.W.U. BASIC expansion vessels used for?
IBO C.W.U. BASIC expansion vessels are designed for hot and cold water installations to maintain and equalize pressure resulting from changes in water volume. The butyl membrane separates the water from the air cushion, stabilizing the operation of the entire system and protecting it against sudden pressure surges.
How does the IBO C.W.U. BASIC series differ from the IBO C.O. BASIC series and GBV tanks?
IBO C.W.U. BASIC vessels are designed for hot and cold water installations and feature a butyl membrane. The IBO C.O. BASIC series consists of vessels for closed heating and solar installations, with an EPDM membrane and a pre-charge pressure of 1.5 bar. GBV tanks, on the other hand, are vertical hydrofor vessels for water supply systems, with significantly greater capacities and a different range of applications.
Where can IBO C.W.U. BASIC expansion vessels be purchased?
As the manufacturer, we do not sell directly online. IBO C.W.U. BASIC expansion vessels are available from our trading partners, installation wholesalers, and authorized online distributors cooperating with the Dambat brand.
What is the warranty period, and where should service requests be submitted?
IBO C.W.U. BASIC expansion vessels are covered by a 24-month (2-year) manufacturer’s warranty. Dambat is the only authorized service provider – the contact form is available at dambat.pl/pages/serwis.
How do you adjust the pre-charge pressure in IBO C.W.U. BASIC vessels?
The pressure is adjusted using the sealed valve (car tire valve) located at the rear of the vessel, under the cover. Pressure is added or reduced using a standard compressor. The pre-charge pressure should be selected according to the parameters of the specific installation, in line with Dambat’s technical documentation.
Are IBO C.W.U. BASIC vessels suitable for use with glycol?
Yes – IBO C.W.U. BASIC expansion vessels are approved for operation with glycol mixtures at a maximum concentration of 50%.
What material is the membrane in IBO C.W.U. BASIC vessels made of?
IBO C.W.U. BASIC expansion vessels are equipped with a membrane made of butyl, a material characterized by high tensile strength and very low gas permeability. The membrane permanently separates the water from the compressed air cushion inside the tank.
- 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: Ø17/28 cm,
- Weight: 1.6 kg,
MATERIALS
• Body: Carbon steel coated with lacquer,
• Diaphragm: Butyl.
Download: IBO_CWU_BASIC_PL-EN_instrukcja.pdf
Download: GARAN_Prawny_obowiazek_zapewnienia_zgodnosci_towaru_z_umowa.pdf
5 BASIC Domestic Hot Water Expansion Vessel
IBO C.W.U. BASIC expansion vessels are tanks designed for hot and cold water installations, used to maintain and equalize pressure resulting from changes in water volume. As the manufacturer, we design the C.W.U. BASIC series with a butyl membrane and a carbon steel body coated with epoxy paint, ensuring durable and reliable operation in water installations. The series is available in capacities from 5 to 50 liters.
Who it is for
- Water and sewer installation companies – we supply proven, ready-to-install components for hot and cold water installations, with complete Dambat technical documentation.
- Sanitary installation designers – we offer vessels with documented pressure and capacity parameters, facilitating system selection and planning.
- Wholesalers and technical stores – we enable you to expand your offering with an economical series of C.W.U. expansion vessels available in a wide range of capacities.
- Service technicians and maintenance departments – we provide vessels covered by a 24-month manufacturer’s warranty and supported by Dambat authorized service.
Applications
- Maintaining and equalizing pressure in hot and cold water installations – compensating for changes in water volume resulting from heating.
- Operation in installations filled with glycol mixtures at a maximum concentration of 50%.
- Protecting water systems in residential buildings, commercial facilities, and industrial installations.
- Working with pumps and pressure systems requiring certified devices compliant with Directive 2014/68/EU.
Features, description, and technical data
The IBO C.W.U. BASIC series from Dambat includes expansion vessels for hot and cold water installations, available in capacities from 5 to 50 liters. High-quality materials and quality control at every stage of production ensure consistent parameters and long-lasting operation.
The vessel body is made of thick carbon steel coated with anti-corrosion lacquer and an external powder epoxy coating, guaranteeing durable surface protection. A butyl membrane is installed inside the steel shell. Butyl is characterized by high tensile strength and very low gas permeability. The membrane completely separates the water from the compressed air cushion, protecting the steel body against internal corrosion.
A sealed valve (car tire valve) is located at the rear of the vessel, under the cover, and is used to check and adjust the pre-charge pressure with a standard compressor. The vessels meet the requirements of Pressure Directive 2014/68/EU.
Parameters of the IBO C.W.U. BASIC series:
- Diaphragm: YES – butyl
- Gas permeability: very low
- Body: carbon steel coated with anti-corrosion lacquer and powder epoxy paint
- Compliance: PED 2014/68/EU Pressure Directive
- Approved media: water, glycol mixtures with a concentration of up to 50%
Detailed technical data for individual models (pre-charge pressure, operating pressure, dimensions, and weight) are available in the manufacturer’s technical documentation. Warranty: IBO – 24-month (2-year) manufacturer’s warranty. Dambat is the only authorized service provider.
Frequently Asked Questions (FAQ) – IBO C.W.U. BASIC expansion vessels
What are IBO C.W.U. BASIC expansion vessels used for?
IBO C.W.U. BASIC expansion vessels are designed for hot and cold water installations to maintain and equalize pressure resulting from changes in water volume. The butyl membrane separates the water from the air cushion, stabilizing the operation of the entire system and protecting it against sudden pressure surges.
How does the IBO C.W.U. BASIC series differ from the IBO C.O. BASIC series and GBV tanks?
IBO C.W.U. BASIC vessels are designed for hot and cold water installations and feature a butyl membrane. The IBO C.O. BASIC series consists of vessels for closed heating and solar installations, with an EPDM membrane and a pre-charge pressure of 1.5 bar. GBV tanks, on the other hand, are vertical hydrofor vessels for water supply systems, with significantly greater capacities and a different range of applications.
Where can IBO C.W.U. BASIC expansion vessels be purchased?
As the manufacturer, we do not sell directly online. IBO C.W.U. BASIC expansion vessels are available from our trading partners, installation wholesalers, and authorized online distributors cooperating with the Dambat brand.
What is the warranty period, and where should service requests be submitted?
IBO C.W.U. BASIC expansion vessels are covered by a 24-month (2-year) manufacturer’s warranty. Dambat is the only authorized service provider – the contact form is available at dambat.pl/pages/serwis.
How do you adjust the pre-charge pressure in IBO C.W.U. BASIC vessels?
The pressure is adjusted using the sealed valve (car tire valve) located at the rear of the vessel, under the cover. Pressure is added or reduced using a standard compressor. The pre-charge pressure should be selected according to the parameters of the specific installation, in line with Dambat’s technical documentation.
Are IBO C.W.U. BASIC vessels suitable for use with glycol?
Yes – IBO C.W.U. BASIC expansion vessels are approved for operation with glycol mixtures at a maximum concentration of 50%.
What material is the membrane in IBO C.W.U. BASIC vessels made of?
IBO C.W.U. BASIC expansion vessels are equipped with a membrane made of butyl, a material characterized by high tensile strength and very low gas permeability. The membrane permanently separates the water from the compressed air cushion inside the tank.

