Expansion vessel for Central Heating IBAIONDO 35L

Product detailed description

In residential and commercial central heating systems, thermal expansion of water due to heating and cooling cycles can cause pressure fluctuations. This can lead to frequent venting through safety valves unless properly managed. The IBAIONDO 35L expansion vessel is specifically designed for such applications, ensuring stable system pressure and preventing unnecessary release of water and energy. Installers typically integrate these vessels into closed-loop systems, either during new builds or system upgrades, to maintain hydraulic balance and prolong component life.

These vessels are commonly found in both single and multi-family dwellings, as well as in light commercial buildings with hydronic heating. They are often part of larger system configurations that include boilers, heat pumps, or solar thermal collectors. The correct selection and installation of the expansion vessel are essential for system performance and safety. The IBAIONDO 35L is suitable for use in systems with moderate thermal loads and where space allows for the vessel’s dimensions.

Technical parameters

Type	Expansion vessel for central heating
Volume	35 l
Max. working pressure	5 bar
Pre-charge pressure	1.5 bar
Operating temperature	-10°C to +100°C
Membrane	Fixed EPDM
Material	Steel with powder coating, wall thickness 1 mm
Colour	Red
Connection	3/4 inch
Net weight	4.860 kg
Warranty	2 years
EAN	5900308748701
Code	NP.CO.35.IB
Brand	Hydroland

The 35L capacity ensures sufficient volume to accommodate expansion in systems with standard thermal mass. The maximum working pressure of 5 bar indicates the upper limit for safe operation under normal conditions. The pre-charge pressure of 1.5 bar is set at factory and must be verified upon installation. The operating temperature range from -10°C to +100°C makes this vessel suitable for most central heating environments. These parameters are critical for proper system sizing and compatibility with existing components such as pressure relief valves and circulation pumps.

Installation and connection

The vessel is connected via a 3/4 inch threaded port, which requires matching fittings on the system side. It should be installed in a location that is easily accessible for inspection and maintenance, and where it is not exposed to freezing conditions. The pre-charge pressure must be checked using a pressure gauge and adjusted if necessary before connecting to the system. Common installation errors include incorrect orientation (vertical installation is recommended), failure to isolate the vessel during charging, and neglecting to bleed air from the system after installation. A pressure relief valve must also be installed downstream to prevent overpressure scenarios.

Compatibility and accessories

This expansion vessel is compatible with standard central heating systems using water as the heat transfer medium. It is typically used in conjunction with pressure relief valves, circulators, and boiler controls. Accessories such as pressure gauges and isolation valves may need to be added separately to ensure full functionality. There are no specific related products listed for this model, but it is recommended to use components from the same manufacturer for consistent performance and support.

Technical background for designers

The vessel operates on the principle of separating gas and liquid phases using a fixed EPDM membrane. As the system water expands, it compresses the pre-charged air chamber, maintaining system pressure within safe limits. The powder-coated steel construction provides corrosion resistance and durability in wet environments. The 1 mm wall thickness ensures structural integrity under working pressure and thermal cycling. Long-term efficiency depends on the correct pre-charge pressure, membrane condition, and absence of contamination in the system water. Proper integration into the system loop ensures minimal flow resistance and optimal response time to pressure changes.

Service and operation

Periodic checks of the pre-charge pressure are essential to maintain system stability. The vessel should be inspected for signs of leakage, membrane degradation, or abnormal pressure fluctuations. While no specific service intervals are provided in the brief, it is advisable to conduct annual checks as part of routine system maintenance. No internal cleaning or replacement parts are required unless damage is observed. If the membrane fails, the vessel must be replaced entirely to avoid system contamination and loss of function.

Frequently asked questions

Can the IBAIONDO 35L be used in a closed-loop solar heating system?
Yes, provided the system operates within the specified temperature and pressure range. The vessel will manage thermal expansion caused by solar collectors and storage tanks.

Is it possible to adjust the pre-charge pressure after installation?
Yes, using a pressure gauge and hand pump, but this should be done with the vessel isolated from the system to avoid over-pressurisation or water ingress into the air chamber.

Can this vessel be installed horizontally?
While vertical installation is recommended for optimal performance, horizontal installation is acceptable as long as the connection ports remain above the lowest point to prevent water accumulation inside the vessel.