Nuaire MRXBOXAB-ECO4 Heat Recovery System


Nuaire MRXBOXAB-ECO4 Heat Recovery System

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Further Information

Key Features

  • Meets the latest building control regulations
  • Integral humidity sensor
  • Up to 95% Heat recovery
  • Summer Bypass 
  • Suitable for houses up to 300m2
  • Fully serviceable unit with all parts accessible
  • 5-year warranty: 1-year parts and labour, remaining years parts only
  • In addition to a choice of compatible ducting systems a full range of controls, sensors, in-line silencers, floor/wall/ceiling inlet and outlet diffusers are available to complete the installation


Nuaire MRXBOXAB-ECO4 Heat Recovery System

Product Part Number

Nuaire AB-ECO4 - AB-ECO4

Nuaire Opposite Handed ECO4 - AB-ECO4-OH


The MMRXBOX-ECO4 (formerly MRXBOX95AB-WH2) is Nuaire's largest capacity residential MVHR unit, providing optimised, balanced supply and mechanical extract ventilation with heat recovery of up to 95% for large properties of up to 300m2 / 3000ft2 in size.  It has an extremely low Specific Fan Power (SFP) rating, low running costs, and uses low voltage DC fans but can effectively and quietly ventilate the kitchen and up to eight wet rooms.  

Please note - You can purchase the heat recovery unit with or without the ductwork on this listing 

This heat recovery unit and Standard semi rigid radial ducting kit meets the highest and latest Building Regulation requirements and are suitable for newly constructed homes and renovation projects

Please call our sales team on 028 2827 5150 / +353 1526 7452 if you would like more information about upgrading your kit.

Technical Features

  • Dimensions (H x L x W): 710 x 710 x 585 (mm)
  • Specific fan power as low as 0.62 wls
  • 2 x G3 easy to clean or replace filters
  • EPP construction with a metal outer cover
  • The unit has 2 x low energy, volume DC motors
  • Measures humidity/moisture in kitchen and bathroom(s) and automatically boosts when above normal
  • Installation is recommended onto a secure wall
  • The condensate drain is fitted to the bottom of the unit, we recommend that a flexible connection is fitted between the drain and overflow pipe


The unit can be controlled by manual speed settings on the unit with additional boost switches and sensors or with the use of an optional 3 speed controller

The units have two speeds and is adjusted manually by a boost switch, the fans can be independently adjusted at the unit with potometers located at the front of the unit, All versions have the following functions integrally mounted within the fan unit on a purpose made PCB, all such components pre-wired and factory fitted by the manufacturer:

  • Independent control of background supply and extract flow rates
  • Independent control of boost speed supply and extract flow rates 
  • Integral heat exchanger frost protection
  • Integral adjustable run on timer
  • Fan failure indication
  • Integral S/L terminal for boost from remote switch, e.g. light switch
  • Indication and controls – The unit also has clear LED visual indication for maintenance, servicing and operation mode, i.e. summer bypass, frost protection

Technical Specification

Nuaire ECO4 Technical Spec





Heat Recovery efficiency %


Digital Controller


Boost Switch control


Interactive control


Humidity control

Internal sensor

Airflow rate Max m3/h


Airflow rate @ 100Pa m3/h


Max dwelling size M2

300 (uk)

Max room extraction

Kitchen plus 7 extraction points

Specific fan power (lowest)


Dimensions W x H x D (mm)

710 x 710 x 585




Yes  - 2 x G3

Pre/ Post Heater


Summer Bypass 


Frost protection 


Sound level @3m db.(a)



Floor / wall

Ductwork connections


Duct Diameter

4 x 200mm

Condensate drain



5-year: 1 year parts and labour, remaining years parts only

Country of manufacture


Heat exchanger

Counterflow heat exchanger (PVC)

Available room sensors

Humidity, Timer, Pir





SAP Appendix Q


Fireplace mode


Alarm system integration


Passive House


ERP rating





Quiet-Vent Semi Rigid Ducting Kit

Ducting Kit Contents (180mm) Part Number 12 Point 13 Point 14 Point 15 Point 16 Point 17 Point 18 Point
125mm metal extract valve MW124 5 5 5 6 6 7 7
125mm metal supply valve MW125 7 8 9 9 10 10 11
180mm x 2 meter metal duct P180M-2 4 4 4 4 4 4 4
180mm B90 vent pressed bend B90180M 10 10 10 10 10 10 10
180mm NP vent male coupling C180MM 8 8 8 8 8 8 8
Metre foil backed glass fibre insulation INS22 4 4 4 4 4 4 4
180mm exterior grille s/steel louvered cowl 9041227 2 2 2 2 2 2 2
Blauberg 75mm x 50 meter regular radial duct (75mm) RK75/50 4 4 5 5 6 6 6
90° Plenum with additional 350mm round pipe (Quiet-Vent) QV75PLEN90 12 13 14 15 16 17 18
Blauberg sealing ring (pack of 10) (75mm) RL75 3 3 3 3 4 4 4
QV 15 pt rear entry distribution box 150 spigot (75mm) QV75-15180RE 2 2 2 2 2 2 2



BPC have years of experience in delivering equipment around the UK and other Worldwide destinations. Our dedicated dispatch team work hard to ensure the highest standards are met so that your goods arrive on-time and in pristine condition.

Our market knowledge and experience allow us to match our service to meet your requirements swiftly and safely.

Free Delivery

We offer free delivery on any order over £100 to any mainland UK or Ireland address  

Worldwide Delivery

Worldwide delivery is possible on almost all our products at low costs, delivery to countries outside the EU are normally delivered to the nearest customs office, port or terminal for the purchaser to collect and complete custom clearance.

Please contact us to confirm shipping cost and availability.  

End-To-End Support Delivery is available within 48-72 hrs, depending on method of transport, for hundreds of stock items.

Customers receiving a pallet delivery will be emailed on day of dispatch advising of delivery date. Parcel deliveries will be notified via email or SMS directly from DPD.

These checks are part of a unique commitment to building relationships with customers, understanding their specific delivery needs and responding to them positively and promptly.  

We deliver on Service

Key components such as ductwork and fittings plus the most popular selling MVHR units are kept in stock in our UK-based warehouse, which means that you receive the best possible delivery dates.

All goods are expertly packed by a professional team so that your equipment is received in pristine condition ready for installation.

All deliveries co-ordinated to suit your specific requirements and construction programme.

Delivery Partners

We only use the couriers with the highest standard of service that include

  • Fastway
  • DPD
  • Montgomery Transport
  • Liam Connolly Roadfreight Ltd
  • Europa Worldwide


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Installation Service

If you would like to learn more about our installation service, please contact us:

Call us on 028 28 275 150 or click below to contact us online

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