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Intelligent Single Room Heat Recovery Unit

Single Room heat recovery units work by continuously extracting moist air from rooms in the home, which is especially important in bathrooms, utility rooms and kitchens. This heat energy transfer can help save money on energy costs, because it keeps temperatures more constant than when opening windows for ventilation.

Single Room Heat Recovery (SRHR) uses the heat from the stale air that is being extracted to warm up the fresh air that is coming in. Therefore bringing in fresh but pre-warmed air providing ventilation whilst also saving energy. This type of ventilation is ideal for refurbishment applications. A SRHR unit that works as a heat exchanger extractor fan and is a ventilation system designed for one-room installation, such as a kitchen or bathroom.

The heatSava is an intelligent through the wall single room heat recovery unit ideal for bathrooms, kitchens, WC’s and utility rooms achieving up to 75% efficiency.

Key Features

  • DC Motor
    DC Motor

    Incorporates a long life, low watt ball bearing DC motor.

  • Made In The UK
    Made In The UK

    Supporting our local economy, lowering the carbon footprint.

  • Intellitrac Humidity Tracking
    Intellitrac Humidity Tracking

    Incorporates intellitrac technology, a unique humidity tracking controls.

  • Wireless

    Available with wireless remote control.

  • 5 Year Warranty
    5 Year Warranty

    High quality products for peace of mind, saving time, money and hassle.


Sufficient Ventilation

Modern living has now become increasingly energy conscious, and with the Government’s ambitious target to reduce carbon emissions by 57% by 2030 on 1990 levels, energy efficient products such as the heatSava are helping to address the reduction in energy wastage.

It is important to recognise, however, that by sealing up our homes, making them warmer and more energy efficient, we must ensure that we sufficiently ventilate them to maintain good, healthy indoor air quality.

Recovers Up To 75% Of The Heat From The Air

The heatSava is an energy efficient, throughthe- wall mini ventilation unit called a Single Room Heat Recovery unit (SRHR). It has been designed for people who are looking for new and innovative ways to save energy.

Recovering up to 75% of heat from the air that would normally be lost through extraction, the heatSava reduces carbon emissions, whilst providing continuous all year round ventilation.

It is available in 100mm and 150mm for mounting through external walls in WCs, kitchens, bathrooms and utility rooms, to either replace existing extract fans or for new installations.

How Does The heatSava Work?

The heatSava extracts air from the kitchen or bathroom, which passes over a high efficiency tubular heat exchange cell. The unique design of the cell enables the air to cyclone around the barrel, just like a corkscrew.

As it does so, the heat from the extracted air is retained in the cell before it reaches atmosphere. At the same time, fresh air from outside is supplied through the tubes, collecting up to 75% of the heat from the extracted air before returning it into the room, providing savings on energy costs.

The heatSava runs continuously 24 hours a day on a low background trickle rate to provide constant all year round good indoor air quality, controlling humidity levels and reducing condensation.

Back to the Future

Within the heatSava, EnviroVent have applied a technology found in early 20th century steam locomotives. In its original form, steam passed through ‘fire tubes’, transferring through the tube wall into the water. By heating the water to high temperatures, steam was generated. Instead of water and steam, the heatSava utilises this same principle for air.

It extracts waste heat from the property, which is transferred through the tube wall to heat the incoming fresh air. At best a locomotive would be 30% efficient, however with modern materials and improvements to this technology the heatSava can now achieve up to 75% efficiency.

Rapid Conversion To SELV

The heatSava is IPX4 rated and can be installed in Zone 1 with RCD protection. It can be quickly and safely converted to an SELV version on-site when necessary with the use of the separate power supply unit included.

Exceptionally Versatile

The direct replacement of an existing traditional extract fan can be simply and quickly achieved, whilst the innovative design also allows the unit to be installed to uneven walls.

It is also high-rise friendly, easily installed from inside the building, without the need for scaffolding. It can be installed in four different positions through 360°, horizontally or vertically to fit into tight spaces or where an existing hole is located just below the ceiling. With its stylish symmetrical design it looks attractive in any position.

Innovative Condensate Facility

The bi-product of any high efficiency heat exchange cell is condensation. This presents a challenge to design engineers to ensure that any condensate which forms inside the cell is directed outside the property and not inside the product, where it could mix with electronic components or damage decorations inside the room.

The unique design of the heatSava allows the heat exchange cell to be completely sealed within the cell casing, providing a totally air tight compartment.Should any condensate form, it would be held within the barrel and drain out directly to atmosphere through the holes located in the cowl at the rear of the unit.

The unique configuration of the air movement through the cell means that no condensate can form within the tubes resulting in all year round quiet, high efficient performance.


Ideal for Every Wall Depth

No matter how many different house types and how many different wall depths, the heatSava has it covered.

The heatSava is available in two cell diameters: 100mm for bathrooms and WC's and the 150mm for kitchens, ideal for both refurbishment and new build installations.

Fitting neatly into almost any wall depth, the length of the cell is available to suit external wall depths of 330mm, 430mm, 500mm and 600mm.

Balancing Act

The heatSava is the only unit on the market to be 100% balanced across both extract and supply airflows, operating in perfect symmetry to achieve optimum performance and efficiency in accordance with current EU Single Room Heat Recovery test methodology.

The tubes have been intelligently engineered with a twist through 15 degrees. This increases the dwell time that the air cyclones around the barrel, improving thermal efficiency. The heatSava has undergone rigorous and extensive testing in world class laboratory facilities.

Hassle-free cleaning and maintenance

The heatSava can be easily cleaned and serviced completely hassle-free by the resident by vacuuming the side of the grilles to maintain efficiency and performance.

For ease of servicing by maintenance personnel when the front cover is removed the unit will stop operating to allow the unique plug out/plug in heat exchange cartridge to be removed using the service key provided. The cell can then be simply vacuumed or wiped clean with a cloth.

Time Elapse Meter

The heatSava incorporates a time elapse meter as standard to monitor operational life.

Intellitrac Humidity Tracking Controls

When the heatSava senses a rise in humidity, caused by increased moisture generation such as cooking or showering, the extract and supply airflows will slowly begin to increase in direct proportion to the increase in humidity. It will then automatically track back down again when humidity falls. This controls condensation quietly and efficiently. 

Product Codes
Product Code
Product Name
Product Description
heatSava 100/330
Standard model, ⌀100 and 330mm length
heatSava 100/430
Standard model, ⌀100 and 430mm length
heatSava 100/500
Standard model, ⌀100 and 500mm length
heatSava 100/600
Standard model, ⌀100 and 600mm length
heatSava 100/330W
Wireless version, ⌀100 and 330mm length
heatSava 100/430W
Wireless version, ⌀100 and 430mm length
heatSava 100/500W
Wireless version, ⌀100 and 500mm length
heatSava 100/600W
Wireless version, ⌀100 and 600mm length
heatSava 150/330
Standard model, ⌀150 and 330mm length
heatSava 150/340
Standard model, ⌀150 and 430mm length
heatSava 150/500
Standard model, ⌀150 and 500mm length
heatSava 150/600
Standard model, ⌀150 and 600mm length
heatSava 150/330W
Wireless version, ⌀150 and 330mm length
heatSava 150/430W
Wireless version, ⌀150 and 430mm length
heatSava 150/500W
Wireless version, ⌀150 and 500mm length
heatSava 50/600W
Wireless version, ⌀150 and 600mm length
Question & Answers

How does MVHR work?

Mechanical Ventilation with Heat Recovery works to ventilate the whole property by extracting air from wet rooms (kitchen, bathroom, toilet, utility’s etc.), this extraction is passed through a central unit to recover as much heat from the air as possible before pushing moisture outside. At the same time fresh air is pulled from outside passed through the central unit to warm up incoming air and filtering it before supplying air to habitable rooms (bedrooms, Livingroom’s, dining rooms etc). These two air flows do not physically mix.

Does ducting require to be insulated?

Any ducting passing through a unheated area will require to be insulated. Ducting connecting the unit to/from atmosphere will require insulating.

How often does a MVHR need servicing?

Any MVHR unit will need the filters checking at least every 6 months. It may be at 12-18 months they will need replacing. This time scale will depend largely on the environment and speed of the unit. Ideally at a 5-year period the system should be checked to confirm operation is to standard.

MVHR is noisy, running fast:

This can be dependent on what MVHR unit you have. To ensure minimal noise units must be installed as per the design using proprietary components. Systems must also be commissioned and set up correctly to ensure performance. Some units may have humidity sensors that automatically increase air flow speed to control humidity levels, therefore at times of high humidity the system will be working harder. Some units may also automatically increase in speed as filters become clogged up.

Can I turn the unit off?

It is not recommended to turn the unit off, other than for maintenance. Turning the unit off can damage the unit and invalidate its warranty. Also, by turning the unit off and stopping air movement in a property can lead to other issues, condensation, mould, smells, etc...
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