Geberit energy retaining valve ERV The pinnacle for a better energy efficiency

The Geberit energy retaining valve ERV seals every last leak

Energy-saving measures are standard features of today’s buildings and are usually applied to the whole structure. Nevertheless, there had always been a missing piece to the puzzle that no one had been able to solve when it came to ventilation for the stack – that is, until the Geberit energy retaining valve ERV came along. When a toilet is flushed, for instance, this kind of opening prevents negative pressure from forming and traps from being blown empty. In the past, the open stack would always result in constant heat losses via the drainage system.

Now, however, the innovative Geberit energy retaining valve ERV makes this problem a thing of the past by:

only opening when required thanks to its patented diaphragm system
always ensuring pressure compensation when required
preventing unnecessary heat losses and thereby increasing the energy efficiency of the building

The economic contribution to climate change mitigation

Positive effects that pay off

Depending on the building structure, location and weather conditions, a Geberit energy retaining valve ERV installation can pay for itself within five to ten years*. People who use roof terrace areas can also benefit from the Geberit energy retaining valve ERV, as it prevents unpleasant odours escaping from ventilation pipes.

Save energy without losing functionality – up to 50 litres of heating oil per year can be saved in this way*
Can be mounted onto a diameter of d110 and adapted to suit all common installation methods
Maintenance-free with protection against insects and frost resistance

*Information based on model calculations using air temperatures in Lucerne (Switzerland) for a multi-storey building and uninsulated stacks.

Here’s how the Geberit energy retaining valve ERV works

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Heat loss from the roof

Thermal image of the ventilation pipes with Geberit energy retaining valve ERV and open at the top

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Looking through an infrared camera reveals clear differences in surface temperature, which are especially visible in cold weather.

Appropriate ventilation of sanitary pipelines

The Geberit energy retaining valve ERV seals the ventilation pipe for waste water above the roof using a patented magnetic diaphragm system. This system opens automatically when pressure compensation is required. The rest of the time, it retains heat inside the building. Overpressure from the sewage system can escape via the Geberit energy retaining valve ERV, as the diaphragms open in both directions. The Geberit energy retaining valve ERV therefore meets the requirements of the standard SN 592000.

Visible heat loss without Geberit energy retaining valve ERV

Working on behalf of the Swiss Federal Office of Energy SFOE, the School of Engineering and Architecture at Lucerne University conducted a study on heat loss from functional openings in building shells. Findings from this study show that heat is lost via the weathering slates.

Appropriate ventilation with the Geberit energy retaining valve ERV diaphragm system

When there is no waste water flowing through the stack, the diaphragms stay closed – preventing energy loss.

If negative pressure arises when a toilet is used, for instance, the diaphragms open and air flows into the system.

They also open if they need to compensate for high levels of overpressure from the sewage system.

Licensors / Project sponsors

OEKAG WasserTechnik AG / Swiss Climate Foundation / Swiss Federal Office of Energy (SFOE)