Where is a heat recovery unit usually installed?

In modern homes, we pay more and more attention to energy efficiency and indoor air quality. Especially in A+ energy class homes, recuperative ventilation systems are becoming not only a matter of convenience, but also a matter of necessity. However, one of the most important aspects that often determines the efficiency of the entire system is the appropriate installation location of the heat exchanger. A properly installed heat exchanger not only ensures optimal air circulation, but also significantly reduces heating costs.

In this article, we will discuss in detail where a heat recovery unit is most commonly installed, what factors determine the choice of the right location, and what mistakes should be avoided. You will learn about the most popular locations for installing a heat recovery unit in both private homes and apartments, and how to properly prepare for the installation of this device.

The role of the recuperator in the home ventilation system

A heat recovery system is an essential component of mechanical ventilation with heat recovery (MVHR). Its main purpose is to ensure a constant supply of fresh air to the premises, while conserving energy that would otherwise be lost with the exhaust air. The heat exchanger takes heat from the outgoing air and transfers it to the incoming fresh air, thus reducing the need for heating or cooling.

Centralized ventilation with a recuperator ensures not only energy savings, but also better air quality in the home. Modern houses are being built increasingly airtight, so natural ventilation becomes insufficiently effective. This is especially relevant for A+ energy class houses, where a recuperation system is necessary to maintain proper air circulation and humidity levels.

Proper installation of the heat exchanger directly affects the efficiency of the system. An incorrectly selected location can cause noise, reduce energy savings and shorten the service life of the equipment. Lithuanian technical construction regulations also specify that in A+ class buildings the heat recovery system must ensure at least 75% heat recovery, which is achieved only with a properly installed ventilation system.

Most common places to install a heat recovery unit

The location of the recuperator in the house is not random - it is chosen taking into account technical, practical and comfort aspects. Installation of ventilation equipment requires careful planning so that the system operates efficiently and reliably. In Lithuania and Europe, recuperators are most often installed in the following places:

Technical room or utility room

This is the most popular and recommended place to install a heat recovery unit. Other engineering networks (heating system, water heater) are usually already installed in the technical room, so it is convenient to install a ventilation system as well.

This place ensures:

• easy access to the device for maintenance
• centralized duct installation
• noise protection in main living spaces
• stable ambient temperature

Attic or shed

In many private homes, the heat recovery system is installed in the attic.

This place has the following advantages:

• enough space for the device and ducts
• shorter ducts to roof ventilation outlets
• the noise from the recuperator is less audible

However, it is important to note that the attic must be insulated if the heat recovery unit is installed in this location. In an unheated attic, there is a risk that the unit may freeze in winter or that the cooled air in heated rooms will cause condensation to accumulate in the ducts.

Basement or semi-basement

The basement is also a suitable place to install a heat recovery unit, especially when there is no technical room in the house.

Advantages of this place:

• the noise emitted by the recuperator does not spread to living spaces
• there is usually enough space for equipment and ducts
• stable temperature all year round

However, when installing a heat recovery unit in a basement, it is necessary to ensure proper humidity control and sufficient thermal insulation to prevent condensation.

Special ventilation cabinet

In apartments or compact houses where there is no separate technical room, the recuperator is often installed in a specially equipped ventilation cabinet.

Such a wardrobe is usually installed:

• in the corridor or hallway
• in the bathroom
• in the kitchen (less often, due to possible noise)

The interior of the cabinet is lined with soundproofing to reduce noise transmission. It is important to ensure that the cabinet is large enough to allow space around the unit for air circulation and maintenance.

Installation differences in apartments and private houses

Installing a heat recovery unit in apartments poses greater challenges due to limited space. Here, the following are most commonly used:

• compact, wall-mounted heat exchangers
• flat, ceiling-mounted models
• mini recuperators for ventilation of one or several rooms

In private homes, more powerful, centralized systems are installed that serve the entire house. The installation location here is selected based on the size of the system, ductwork options, and ease of maintenance.

In A+ class homes, the location of the recuperator is often planned at the design stage, by installing a special technical room or niche. This allows for optimal use of space and ensures efficient operation of the entire system.

The most important aspects when choosing a location for a heat recovery unit

When choosing the right location for a heat exchanger, it is necessary to consider several essential technical and practical aspects. This choice will determine not only the efficiency of the heat exchanger, but also the reliability and ease of operation of the system.

Proximity to main air ducts

The recuperator should be installed as close as possible to the main duct system and the ventilated rooms. This allows:

• reduce heat loss in ducts
• reduce duct installation costs
• ensure more efficient air distribution
• reduce energy consumption for fans

Long ducts increase resistance, so fans have to work harder, which increases electricity consumption and system noise.

Noise and vibration control

The recuperator emits some noise during operation, so it is important to install it:

• away from the bedrooms
• on special vibration dampers
• apply soundproofing around the device
• use flexible duct connections that transmit less vibration

Modern ventilation units are becoming increasingly quiet, but proper installation can further reduce the noise emitted.

Temperature and humidity regime

The recuperator must be installed in a room that ensures the appropriate temperature:

• not lower than +5°C in winter (to protect against freezing)
• not higher than +40°C in summer
• stable temperature all year round
• controlled humidity level

Some manufacturers recommend even narrower operating temperatures, so it is necessary to follow the specific specifications provided by the manufacturer.

Accessibility for maintenance

One of the most important aspects is convenient access to the device for maintenance:

• for regular filter replacement (every 2-3 months)
• for cleaning the heat exchanger (1-2 times a year)
• for fan service
• for management system maintenance

According to manufacturers' recommendations, at least 60-80 cm of free space should be left around the heat exchanger to facilitate maintenance work.

Mistakes to avoid when installing a heat recovery unit

In practice, there are often mistakes that can significantly reduce the efficiency of ventilation equipment:

• installation of a heat recovery unit in an unheated room without additional insulation
• installation of the device in a difficult-to-reach place (e.g. in low attics)
• insufficient distance to other devices or walls
• lack of duct insulation leading to condensation
• inadequate noise insulation

Preventing these errors helps avoid many problems in the future and ensures the smooth operation and longevity of the system.

Preparation and installation stages of the heat recovery unit

Proper preparation and planning are essential for a successful heat recovery unit installation. The ventilation system design should be prepared before installation begins, ideally during the building design stage.

Design and planning

Before starting installation work, it is necessary to:

• prepare a detailed ventilation system design
• calculate the required heat recovery unit capacity
• plan the layout of the ducts
• provide air intake and exhaust points
• take into account the characteristics of the building and usage habits

The heat exchanger is selected based on the size of the building, the number of residents and the desired ventilation intensity. It is recommended to consult with certified HVAC (heating, ventilation and air conditioning) specialists.

Duct installation

For the efficient operation of the heat recovery system, it is important to properly install the ducts:

• minimize the number of duct bends
• use the shortest possible duct routes
• insulate ducts passing through unheated rooms
• ensure tightness at all connection points
• install noise suppressors in strategic locations

Ducts must be large enough to provide the necessary airflow, but not too large to avoid unnecessary energy loss.

Heat recovery unit installation

Installation of the heat exchanger is carried out in the following stages:

• site preparation – leveling surfaces, necessary electrical installation
• installation of fasteners according to the manufacturer's instructions
• placing or hanging a recuperator
• connecting ducts using flexible joints to reduce vibration
• installation of a condensate drainage system
• electrical connection and control system configuration

It is recommended to entrust the installation process to professionals who have experience with equipment from specific manufacturers and are familiar with the specifics of ventilation systems.

Testing and debugging

After completing the installation work, it is necessary to test and adjust the system:

• system tightness check
• air flow balancing
• noise level measurements
• optimization of automation settings
• filtration efficiency check

Proper system balancing ensures that each room receives the required amount of fresh air, and that exhaust air is efficiently extracted from bathrooms, toilets and kitchens.

Regular maintenance is essential to maintain the efficiency of your heat recovery system. It is recommended to change the filters every 2-3 months, and a more thorough inspection of the system once a year. This helps prevent dust accumulation in the ducts and ensures clean, healthy air in the home.

The importance of professional help

Although some preparatory work can be done independently, the installation of ventilation equipment itself requires specific knowledge and skills. Certified installers ensure that:

• the system is installed according to the manufacturer's recommendations
• all safety requirements are met
• the system would operate at optimal efficiency
• automation is properly configured
• the warranty on the equipment would remain valid

The investment in professional installation pays off through better system performance, lower operating costs, and longer equipment life.

With the right choice of location for the recuperator and professional installation, the heat exchanger will serve efficiently and reliably for many years, ensuring a healthy and comfortable microclimate in the home and significantly reducing energy costs.

FAQ - Frequently Asked Questions

Where is the best place to install a heat recovery unit in a private house?

In a private house, it is best to install the heat recovery unit in a technical or utility room for convenience when connecting ducts and performing maintenance. Also suitable locations are an insulated attic or basement, depending on the layout of the house and specific needs.

Is it possible to install a heat recovery unit in the attic?

Yes, the heat recovery unit can be installed in the attic, but it is necessary to ensure that the attic is sufficiently insulated and easily accessible. The heat recovery unit must be protected from extreme temperature fluctuations and the risk of condensation.

Why is it not recommended to install a heat recovery unit far from the main living areas?

Long duct runs reduce system efficiency, increase energy losses and noise levels. A central location of the heat exchanger, closer to the serviced premises, ensures optimal system performance and lower operating costs.

How much space should be left around the heat exchanger for maintenance?

Manufacturers typically recommend leaving 60-80 cm of free space on all sides for easy filter changes and maintenance. Please refer to your unit's instruction manual for specific requirements.

Is there a regulation on where a heat recovery unit should be installed?

Building regulations and energy efficiency standards may impose specific requirements, especially for A+ or passive houses. It is always recommended to consult with local regulations experts and HVAC specialists during the design phase.