Skip to main content

Renewables Mechanical Ventilation with Heat Recovery (MVHR)

What is MVHR?

MVHR stands for Mechanical Ventilation with Heat Recovery. It can also be referred to as Heat Recovery with Ventilation.

Get in touch with our Renewable Heating Experts

Why use MVHR?

When we started designing and supplying ventilation systems the main reason to have a system was to recover the heat normally lost through the conventional bathroom extractor fans and air supply vents built into windows and walls in every room and it achieves this very well with recovering over 90% of the normally lost heat.
But it does so much more and is now more important than most other systems you will be installing into your home!

How does MVHR work?

A ventilation system with heat recovery (HRV) or (MVHR system) is an energy efficient, controlled and balanced ventilation system. It extracts the moist, stale air from all the wet rooms in your house and replaces it with filtered, fresh, recovered warm air to all your habitable rooms and bedrooms without letting the heat escape.

Your home is fully ventilated throughout the year with as much as 95% of the normally wasted heat being recovered providing you substantial energy savings. A heat recovery system allows your property to stay air tight with no window vents or bathroom extractors being required, creating a healthier and quieter environment.

Maintenance of MVHR

A MVHR unit, like any other building service, requires maintenance and servicing throughout their lifetime to ensure consistent energy efficient ventilation is provided to the home.

Filters are fundamental to Guaranteed Installed Performance, efficiency and indoor air quality and should be cleaned or replaced every 6-12 months.

The heat exchanger is designed to last the lifetime of the unit and should every cleaned 3 to 5 years with an antibacterial cleaner.

Benefits of MVHR (Mechanical Ventilation with Heat Recovery)

Air Quality

Improving the indoor air quality by filtering all the incoming air. Removes bad odours. Helps with asthma and other health issues.

Circulated Air

Prevents mould and condensation. Eliminates the need for bathroom extractor fans and window air vents.

Natural Cooling

Provides natural cooling in warm weather by supplying fresh filtered air.

Efficient Heating

Distributes heat evenly throughout your home. And of course, recovers up to 90% of your normally wasted heat.


Building Control Compliant

Complies with all building control regulations.

It is possible to install to an existing house, but good planning and design is critical, If your house is a bungalow the installation would be very easy as all ductwork would be in your attic space but if your house has a number of floors we would have to work with you to provide solutions to drop ductwork to the rooms below through service voids like wardrobes and storage rooms.

We have installed systems to a lot of period houses and even a castle, you will not be able to achieve the maximum heat recovery rate of 90% but you will achieve almost all the advantages including fresh filtered air and condensation control.

Over the last decade there has been increasing demand on builders, architects and government legislators to increase the thermal efficiency of our homes making them draught free and well insulated. This in turn has caused poorer air quality which can significantly increase the effects of asthma and other respiratory problems, health problems, condensation, mould, dust mites, unpleasant smells and build-up of toxic gases.

For health reasons, recent legislation now makes it almost compulsory for your new air tight home to have a balanced mechanical ventilation system and a heat recovery ventilation system is the most preferred option.

Installing a heat recovery unit is quickly becoming a necessity rather than a lifestyle choice. On completion of the installation the system will require commissioning and we can help you with this or provide an installer local to your area to commission the system.

    Upload project plans