Conventional membrane tanks

Conventional membrane tanks with integrated internal circulation – up to volumes of 3000 liters. Perfect for large flows, with an adjustable gas cushion for drinking water systems.


Save valuable drinking water in your hot water system: expansion water is no longer lost through a safety valve, but is absorbed by the expansion vessel. The replaceable airtight membrane is made from a special butyl rubber and is suitable for drinking water. This version has a single connection on the underside of the tank. Factory equipped with ‘flowjet’: flowthrough, shut-off, and discharge valve for internal circulation in the tank to prevent bacterial growth.

Potable water expansion vessels in pressure-boosting systems

stabilize the drinking water network and reduce the switching frequency. They can be installed at the low-pressure and high-pressure sides of a pressure-boosting system. The mains pressure side is always to be coordinated with the water supply company.


As there are no uniform standards, please observe the drinking water approvals for the individual countries with respect to the selection. These are decisive for the deployment of flowfresh fully flow-through or no flow-through expansion vessels.


The expansion vessels are virtually maintenance-free. In general, it is sufficient to observe flow pressure conditions before the expansion vessel and to check the pre-pressure at least every 5 years since this must always be smaller than the flow pressure. Otherwise, bag wear will increase. The A(U)F expansion vessels are equipped with a Hydrowatch HW that signals bag damage.


Why use convential membrane tanks

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