SEVi Decentralised HRV-Systems

How does a decentralised HRV System work?

In modern homes, the use of ventilation systems has become necessary because there is no sufficient air exchange on a natural way anymore due to the sealing of almost all joints and gaps.


It´s important to have a well insulated and airtight home to save energy, but without a proper ventilation system you´re increasing the risk of stale air, dampness, mould and allergies in your own house because there´s no escape for the moisture.


The SEVi HRV System operates as a decentralised mechanical ventilation system with heat recovery. It doesn´t need extensive ducting like conventional HRV systems.

Benefits for the use of decentralised SEVi HRV-Systems:

  • easy installation, no extensive ducting required 
  • the perfect choice for refurbishments
  • low energy consumption because of low Wattage units
  • easy maintenance, no specialists required
  • high heat recovery performance (up to 90%)
  • a dehumidification effect for your internal room air
  • a certified system, engineered and manufactured in Germany
  • more than 10,000 units have been sold in Germany and operate without complaints

How does it work?

All SEVi HRV-Systems work as decentralised  Heat Recovery Ventilation Systems. They operate without ducts and pipes. This is due to every single unit being equipped with it´s own heat buffer eleminating the need for additional ducting or suspended ceilings in your house or to hire specialists to clean out the entire system on a regular cycle.


Depending on your room size you may need only one set for the area you wish to ventilate. The units are fitted to an external wall and operate in synchronisation with each other. One sucks in fresh air while the other one blows stale air out of the room and they then switch function every 70 seconds using the heat from the expelled air to warm the fresh incoming air.


The heat recovery performance is up to 90%, which means the stale air leaves the room with a temperature of 20° Celsius and the fresh air returns into the room with 18° Celsius. Compared with conventional ventilation (opening windows, vents), you´ll save heating energy and money because the incoming fresh air is already preheated.


SEVi HRV-Systems are easy to install and maintain. Every HRV-Unit runs on 12V DC and all required maintenance can be done by yourself. For example - the heat buffer is built for cleaning in a domestic dishwasher. And there´s no risk of cultivating germs and bacterias in hard-to-reach (and hard-to-clean) ducts and pipes.


Just a simple question to all people who are perhaps still insecure and do not believe that decentralised Heat Recovery Ventilation Systems work well:

What gives you the confidence in a conventional system which aims to carry fresh air in a much narrower air duct  over an average of more than 15 meters before the fresh air will reach the requested room(s) ???