• Central ventilation system LWZ 70 E

    The inexpensive LWZ 70E is a compact and efficient ventilation system for apartments.

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    Ventilation systems from STIEBEL ELTRON

    Advanced ventilation systems: convenience is in the air

    Whether you’re at work, on the couch or in bed: fresh, healthy air at pleasant room temperatures is your guarantee of that all-important feel-good factor. You can easily make noticeable improvements to the purity of the air you breathe indoors, and therefore your overall quality of life, through an innovative STIEBEL ELTRON ventilation system. Our exceptionally convenient advanced ventilation systems ensure regular air changes without wasting valuable energy.

    Convenient ventilation, convenient savings

    A system of automatic air changes with efficient filtration offers you many everyday advantages compared to manual window ventilation. First of all, there’s the convenience. Interiors should be ventilated several times a day to keep the air at optimum levels – and that takes time. Time that many of us simply don’t have. In addition, open windows not only let in cold draughts, but often increased noise, dirt and annoying insects as well. This is a significant nuisance in urban homes in particular that could be very easily resolved with a ventilation system. Allergy sufferers can also breathe a sigh of relief: fully automatic ventilation units have special filters which keep pollen and dust outside.

    At the same time, advanced ventilation systems lower your energy bills. Ventilation systems with heat recovery are particularly energy efficient. Fully automatic ventilation units adjust the supply of fresh air automatically according to the current humidity level, while recovering up to 90 % of the heat that is otherwise lost when ventilating. In winter, the cosy warmth is retained. And talking of efficiency: depending on the model, some ventilation systems can even provide DHW heating and room heating.

    Benefits of advanced ventilation systems

    • Improved indoor air quality
    • Time saved through automatic ventilation
    • Reduction of energy consumption
    • Reduction of harmful emissions
    • Protection of the building fabric
    • Prevention of fungal mould
    • Protection against burglary

    Our solutions

    Why is ventilation so important?

    The extremely effective level of thermal insulation applied to modern homes nowadays makes them so airtight that virtually no energy is lost. Low energy houses in particular have an airtight building envelope primarily to prevent heat losses. This also prevents natural air changes and makes controlled mechanical ventilation essential.
    However, ventilation is also an issue in older homes. As a result of retrofitted thermal insulation measures, there is often no longer an adequate supply of outdoor air through gaps and other previously air-permeable spots. This creates a conflict of interest between practical thermal insulation and the need for fresh air, which can be resolved with controlled mechanical ventilation systems.

    Getting your indoor environment right can be a vicious circle – what do you need to be aware of?

    1. Ventilation: indoor rooms require a regular supply of fresh air. The minimum requirement is a 0.4-fold change of the air in the room every hour.
    2. Mould: a lack of ventilation means higher relative humidity. The result is moisture damage and mould growth.
    3. Energy consumption: ventilation leads to the loss of approx. 50 % of heating energy through windows and infiltration. It’s like throwing money out of the window!
    4. Sealing: an airtight building envelope and tightly sealed windows reduce heating costs, but also greatly reduce the air change rate.

    Controlled or window ventilation

    Protecting the building fabric

    The increasing impermeability of new buildings and modernised residential dwellings calls for continuous air changes, in order to avoid the growth of fungal mould and damage to the building, for example. It makes sense to install a controlled mechanical ventilation system in these instances, since ventilation via windows is not very practicable as the sole means of ventilation. To ensure energy efficient and hygienic minimum air changes, ventilation via windows would have to occur four to six times a day for approx. five minutes each time. The heating would have to be turned off and the windows fully opened, making this approach highly impractical.

    Systematically better ventilation

    Whether you opt for decentralised mechanical ventilation or a central solution, controlled mechanical ventilation systems reliably safeguard the necessary supply of fresh air and – depending on the specific unit – ensure particularly energy efficient room heating and DHW heating. Even when away from home, you can therefore be sure of a pleasant room climate in all living areas. And enjoy the fresh air on your return!

    Decentralised or central: comparison of ventilation systems

    Decentralised mechanical ventilation: accurate and energy efficient

    In the case of decentralised mechanical ventilation, a distinction is drawn between systems with and without heat recovery: decentralised systems with heat recovery have a single unit installed in the external wall of every room to be ventilated. This may involve systems with two fans and heat recovery via a countercurrent heat exchanger, for example. When choosing suitable decentralised units, it is also important to look for the lowest possible sound emissions, as well as ease of cleaning and maintenance. It should be possible to control the individual fans so that the air flow rate can be matched to demand.

    A decentralised ventilation system is especially suitable in the case of renovations or where there are localised humidity problems. The installation work required is usually minimal. Individual units work independently of one another to extract air from rooms where humidity is critical, such as bathrooms and kitchens. In conjunction with a second unit, they ensure good ventilation throughout the living space. Separate sensors control the units subject to the indoor air humidity level.

    Central ventilation: for a fresh ambience throughout

    With central ventilation systems, a distinction is drawn between extract air systems and supply/extract air systems. The simplest and most cost effective system for central controlled mechanical ventilation is an extract air system. Stale air is extracted via ductwork from the extract air areas, such as the kitchen, bathroom and toilet. At the same time, the resulting negative pressure causes fresh air to be drawn through outdoor air apertures directly into the supply air areas (living room, play room, bedrooms). The volume of air extracted from the extract air areas is determined by the fan rate. Occupants can adjust the air flow rate to suit their requirements with a simple step switch. With a small heat pump, the extract air can be utilised for DHW heating and, if required, room heating. Using extract air at relatively high temperatures as a heat source ensures excellent levels of efficiency.

    The ventilation ducts required for this can be let into walls, concrete ceilings, suspended ceilings, the floor, placed under a screed layer, or even installed outside. This option is therefore particularly appropriate for new build and comprehensive modernisation projects. Its major advantage lies in the uniform fresh air quality it delivers throughout the entire building. The energy recovered from the extract air can be used to heat the supply air.

    Unlike an extract air system, a supply/extract air system draws the outdoor air from a central point and distributes it by means of ductwork throughout the supply air areas. Heat is recovered in a countercurrent heat exchanger, transferring up to around 90 % of the latent heat in the extract air to the supply air. The outdoor air is filtered to prevent contamination of the unit and ductwork, and to protect allergy sufferers against the effects of dust and pollen. Filters of various qualities are available. Central supply/extract air systems ensure excellent levels of comfort in the home.

    Ventilation systems for new build and modernisation

    LWZ 8 CS Premium integral system

    A comfortable climate in every situation: excellent ventilation management in new build which meets current EnEV requirements plays a key role in ensuring a healthy indoor environment. The LWZ 8 CS Premium from STIEBEL ELTRON has been specifically designed to meet these requirements. This particularly efficient and elegant unit combines the following four functions: ventilation, room heating, DHW heating and cooling. The integral system can be combined with solar thermal and photovoltaic systems.

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    LWZ 180/280 central ventilation units

    Maximum convenience and efficiency: LWZ 180/280 Premium ventilation units are suitable for apartments, detached houses and commercial properties with an area of up to 200 m² and are a popular choice in new build. They offer you optimum air quality through fully automatic, demand-based ventilation on a room-by-room basis. Intelligent control means you don’t need to manually change the ventilation level.

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    LWE 40 decentralised ventilation unit

    This compact decentralised ventilation unit for rooms with external walls is quick and easy to install with walls up to 800 mm thick. Thanks to heat recovery, you benefit from reduced energy costs – in both new build and modernisation projects. Inflowing air is purified by means of a fine dust filter, making the cleverly designed ventilation system the ideal choice for allergy sufferers.

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