Expansion vessel

The expansion tank is an essential safety component that absorbs the thermal expansion of water and maintains a constant pressure in your circuit. Whether it's a loss of pressure when cold or a recurring leak at the valve, a defective tank (porous or perforated bladder) must be quickly replaced. At ExpertByNet, we offer more than 300 references of tanks dedicated to central heating, hot water heating (ECS), as well as professional tools for their maintenance.

Brand-specific Expansion Tanks

For a like-for-like replacement inside your device's chassis, we stock original and compatible replacement parts from the leading boiler brands:

• SAUNIER DUVAL Boilers: Find direct manufacturer references, such as the specific expansion tank.
• Compatible DIFF Solutions: Reliable and certified alternatives to perfectly fit your equipment. Discover our models for De Dietrich Chappée, for Bosch ÉQUALINE boilers, or for Atlantic.

Generic Heating Tanks and Sanitary Models

For remote installations or the protection of your hot water preparers, our catalog covers all standard capacities:

• Tanks for heating circuits: Universal bladder models to maintain the pressure of your network. For example, find the QUALYX range, available in capacities of 12 liters or 18 liters.
• Sanitary expansion tanks: Designed to absorb variations in the volume of hot sanitary water, like the compact 0.5L DIFF model compatible with Chaffoteaux.

Maintenance: Pressure Check and Reinflation

It is not always necessary to completely replace the part. A deflated expansion tank can often be serviced during the annual maintenance:

Technical Note: Before any order, check the capacity in liters, pre-inflation pressure, and connection diameter of your current expansion tank to guarantee the compatibility of your new part.