Geberit energy retaining valve ERV Prevent heat loss

Energy-efficient construction is now standard practice. However, even modern buildings lose energy unnecessarily in a place that’s often overlooked: via the main vent of the discharge stack, which runs openly out of the roof. In everyday operation, flushing toilets or using several sanitary appliances at the same time causes fluctuating positive and negative pressure in the drainage system, which need to be reliably compensated for to protect traps and prevent sewer gases from entering.

Although traditional stack vent handles this task, it causes continuous heat loss.

This is exactly where the Geberit energy retaining valve ERV comes in, ensuring safe, demand-based pressure equalisation but remaining closed during normal operation. This prevents unnecessary energy losses and increases the building’s energy efficiency – without compromising on functional reliability.

The Geberit energy retaining valve ERV is installed in the main vent of the stack that runs above the roof. Thanks to its patented magnetic diaphragm system, the valve opens automatically in both directions only when needed to safely compensate for negative or positive pressure. The valve remains closed when there is no pressure difference, significantly reducing heat loss from the building.

Excess pressure from the sewage system can escape safely. In the event of negative pressure, air flows into the stack in a controlled manner. The valve therefore meets the requirements of standard SN 592000.

When closed, the valve also prevents unpleasant sewer gases from escaping – a clear advantage, especially for roof terraces.

The Geberit energy retaining valve ERV is quick and easy to attach to any ventilation pipe for waste water using standard materials for d110 pipes. Once installed, the Geberit energy retaining valve ERV can withstand the effects of the environment and weather and doesn’t require any maintenance.