Stiebel Eltron Decentralised Heat Recovery System VLR 70 S

Heat Recovery Ventilation

Unless your home is a very new build, you probably use a lot of energy to heat and cool it. Traditionally, builders ventilated their buildings with passive sources, such as vents or windows. While these methods let air into the home, they don’t do anything to help maintain a comfortable temperature indoors. Warm air from your heater escapes through a gap under the window and cold air from outside replaces it. Under these circumstances, turning the heater up and running it for longer seems like the only choice. But of course, doing so uses more energy and costs more money. To combat this problem, newer builds are designed to minimise air leakage, which means changing the way we think about ventilation. Instead of relying on passive sources of ventilation which create leaks, newer buildings are turning to heat recovery.  Heat recovery ventilation systems provide an air source, remove moisture and pollutants without compromising energy efficiency.

How does a decentralised heat recovery ventilation system with the VLR 70 S work?

VLR 70 S units operate in pairs. Each unit operates on the opposite cycle to the unit it’s paired with. One unit starts in extraction mode while the other operates as an intake unit. On an extraction cycle, the unit retains heat energy from the outgoing air. When the unit switches to an intake cycle, the unit transfers this heat to the fresh air stream. Most importantly, a VLR 70 S has a filter to ensure that pollen and dust do not enter the building, and also removes pollutants and moisture from the home. The units switch cycles every 70 seconds to distribute air evenly.

These units can also operate without heat recovery. This setting is useful for Summer nights when the outdoor temperature drops below the temperature inside.

Why choose a VLR 70 S heat recovery system?

Decentralised heat recovery units like this one offer a heat recovery solution to smaller spaces, where there may not be enough space for a centralised system. Homeowners who wish to use heat recovery in an older home may also find that using a decentralised system in a single room is an achievable solution.

Key Features

• Achieve up to 92 % heat recovery
• Requires hardwiring to a wall control for operation
• Unit can be hardwired and paired to up to 7 additional units
• Operates quietly
• Provides fresh air supply and minimises loss of heat energy
• Fine dust filter available as an accessory
• Suitable for walls up to 300mm thick
• Accessories available for thicker walls (up to 800mm)

Compare Decentralised Heat Recovery Units

Retrofitting VLR 70 S to older properties.

This type of unit may also work for people looking for ways to make an older home more energy-efficient. Of course, to work effectively, a decentralised unit needs to be installed in an airtight space, so the way you use this unit in might look different to newer builds. You could, for example, seal off the living room and use heat recovery there. To discuss your options, get in touch with our friendly sales team.