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Controllers and Accessories

Heat Recovery System Controllability

We pride ourselves on being able to supply one of the largest ranges of energy efficient ventilation systems available at guaranteed discount prices throughout the UK and Ireland.

To further increase the efficiency and controllability of the heat recovery units we can specify the following controllers to our heat recovery kits.


Digital Controller - These units use a hard wired or wireless master controller allowing you to view all required information and set speeds and various functions. This type of system will provide the quietest system due to the amount of controllability. Additional controllability can also be with humidity, bathroom boost switches, light switch, etc

Analogue Controller - These units are controlled with a speed selector switch using either humidity sensors or boost switches to the bathrooms. This type of system provides both the most economicall solution but also requires the least user input, making it ideal for housing developments and social housing.

Humidity Sensors - A humidy sensor will boost the airflow when humidity increases beyond the set point of normally 70%. There are number of types: 

  • Integral digital - Fitted inside the unit and programmable from the digital controller - The best solution for bathrooms close to the MVHR unit

  • Integral analogue - Fitted inside the unit and set by potometer - The best cost efficient solution

  • Duct mounted - Fitted inside the ductwork close to the unit and set at sensor - Difficult to set and top nuisance tripping

  • Digital wall mounted - Fitted on the bathroom wall and programmed at the digital controller - The best option for bathrooms a long distance from unit but only a small number can be used per unit

  • Analogue wall mounted - Fitted on bathroom wall and set at sensor - The best option cost efficent systems for units without a integral humidity sensor.

Boost Switches - We always recommend boost switches fitted to accessible locations to bathrooms allowing to manual boost the system if or when required. 

  • Normal boost switch - A single gang switch to boost from high to low - suitable for most types of system 

  • Momentary boost switch - Allows you to boost the Digital unit for a set time of up to 30 minutes (Programmed at the unit)

  • Timer boost switch - Allows you to boost the Analogue unit for a set time of up to 30 minutes (Set at the switch with dip switch)

PIR Sensors - The use of PIR sensors are possible to some systems but recommend they should be fitted with a time delay to stop nuisance tripping

CO2 Sensors - The use of quality CO2 sensors are recommended to commercial projects like school rooms but due to the expense are rarely fitted to domestic systems

Ventwise Controller - The Ventwise controller has been designed to fully automate a system - Expensive option but provides ultimate features

• Automatically boosts fan when temperature of the supply pipe to a shower or bath increases
• Automatically boosts fan when electric hob is switched on
• Can be used in conjunction with manual override input
• Adjustable overrun timer
• Two sensor options available.


 Heat Recovery Silencerssilencer

Heat Recovery Silencers

An attenation silencer works the same as a silencer of a car and reduces turbulance in the ducting making the system quieter.

  • Radial ducting system - A solid metal silencer can be fitted on the air supply pipe before the manafold and flexible acoustic ducting used for the final connections to the MVHR unit for the best results. A silencer is not usually required to the extraction manifold
  • Branched Ducting System - A solid silencer can be fitted on the main air supply pipe and we recommend flexible acoustic ducting to all final connections to both extraction, supply valves and unit to help controll noise transfer between rooms

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