Diaphragm expansion vessel REFIX DE-25, 25L, 16 bar / 70°C, threaded connection G3/4", blue, for DHW, fire protection, underfloor heating, geothermal, hanging, with non-replaceable membrane 7304015

Expansion vessels – the key to a stable installation

The REFIX DE-25 expansion vessel is a reliable device that ensures maintaining optimal pressure in closed heating, water supply, and underfloor heating and geothermal systems. Its main task is to compensate for changes in water volume resulting from temperature fluctuations and to equalize any fluid losses. This protects installation components from damage caused by excessive pressure or vacuum, and also prevents cavitation and evaporation.

This expansion vessel is particularly recommended for installations that do not have to meet the strict DIN 1988 standards, such as fire protection or industrial systems. Its construction and materials guarantee corrosion resistance and long-lasting, trouble-free operation.

Construction and application

The REFIX DE-25 vessel with a capacity of 25 liters and a maximum working pressure of 16 bar has been designed to operate at a temperature of up to 70°C. It has a G3/4” threaded connection, which facilitates its integration with the existing installation. Made in blue, it is intended for use in domestic hot water (DHW) installations. It is equipped with a non-replaceable diaphragm, compliant with PN-EN 13831, which effectively separates water from air.

• Versatility: ideal for DHW, underfloor heating, geothermal systems, and fire protection systems.
• Safety: has a PZH certificate confirming its suitability for contact with drinking water.
• Durability: parts in contact with water are protected against corrosion, which extends the life of the device.
• Installation: hanging design makes it easy to install in limited spaces.
• Compliance with standards: approval in accordance with the pressure equipment directive 2014/68/EU (CE marking).

Why choose REFIX DE-25?

The REFIX DE-25 expansion vessel is an investment in the safety and reliability of your installation. By maintaining constant pressure, it protects circulation pumps, valves and other components from mechanical damage and corrosion. This extends their lifespan and reduces the risk of failure. In addition, stable pressure ensures comfort and optimal performance of the heating or water supply system. By choosing this model, you gain confidence in solid workmanship and compliance with applicable European standards.