162: Introducing the LUNOS

When I first saw the LUNOS, I was skeptical. How could this be a ventilation solution with true heat recovery, when it’s so small? I particularly weary of systems claiming to be ‘heat recovery ventilation’, because so much of what’s typically sold and installed as such in New Zealand, simply is not. Worse than that, a lot of so called ‘ventilation’ systems source air from dirty roof spaces. This is not fresh air.

So, could the LUNOS be the solution for installing ventilation in hard to reach places and for retrofitting true heat recovery? Is this the device that could help keep my windows dry in winter without cancelling out any attempt to heat my home?

Wayne Delport

Wayne has always been drawn to working with architects because he wants to help people and loves the opportunity to “create something out of nothing”. Trained as a mechanical engineer, he is now Sales and Technical Manager at The Heating Company International.

Fresh Air

For most retrofit installations of ventilation systems, Wayne and his team are responding to a desire for fresh air to prevent a build up of moisture. Nine times out of ten, there are children in the house and the family’s health is the priority.

For new builds, a ventilation system is a required piece of the performance puzzle when someone is constructing and airtight envelope.

Pro Clima
Sponsored Link – See Pro Clima for all your building weathertightness needs.


LUNOS is a Berlin based manufacturer of innovative and energy efficient ventilation systems. The company website states that they’ve been building an ‘outstanding international reputation’ for over 50 years and now have nearly 40 agencies throughout Germany and the World.

LUNOS heat recovery ventilation systems fit in places where other ventilation systems won’t, such as skillion or cathedral type roofs where there is no ceiling space. There’s no ducting involved, but there is heat recovery. There are various models, but the main ones available here are:

  • : Installed in pairs (as a minimum) these cycle between drawing air in, then expelling air out of the room. They’re best for living areas and bedrooms.
  • ego: Best for wet areas such as bathrooms and laundries.
The Lunos e2 through wall heat recovery ventilation system
The Lunos e2 through wall heat recovery ventilation system

These devices achieve their impressive stated heat recovery performance with a ceramic disc. When warm, stale and humid air is extracted, it passes over this ceramic disc and the mass of the disc absorbs some warmth from the expelling air. The fan then switches direction and draws in fresh air over the warm disk, delivering fresh but warm air back into the room. Kind of like a pair of lungs.

Coming this year will be the LUNOS Nexxt, a larger volume, decentralised heat recovery system with it’s own touchscreen controls and optional CO2 sensor.

There’s also the Silvento which is a super quiet extractor fan. This would be great for ensuites or bathrooms as an alternative to noisy ceiling fans that struggle to keep mist at bay.

Whole House Performance

Even though the LUNOS is a decentralised, through the wall ventilator, it is possible to have a series of them all connected via a controller to condition your whole house, just like a full whole house heat recovery system.

Individual LUNOS fans can be installed around the home
Individual LUNOS fans can be installed around the home to create an intelligent whole house ventilation system


The LUNOS is a high quality piece of German engineered equipment. For context, a fully ducted, whole house system is going to be a $10,000-$12,000 investment. You’ll also want to factor in the comfort, health and direct heating savings from having effective heat recovery. Wayne wouldn’t be drawn on exact costs for the LUNOS unit, so best to contact The Heating Company to see if the LUNOS is right for you and to get a system sized and priced appropriately.

In terms of running costs, they’re negligible at about 1c per fan per day.

The Heating Company

The Heating Company is the New Zealand distributor for the LUNOS and also stocks a range of radiant heating solutions. If you’ve got any questions, I recommend getting in touch with Wayne and his team. Tell them you heard about it from Home Style Green!

The Heating Company stocks a range of radiative heating options and is the New Zealand distributor for LUNOS
The Heating Company stocks a range of radiant heating options and is the New Zealand distributor for LUNOS

  • mcutlerwelsh

    I had some questions on Twitter about the effectiveness of single room ventilation for effective dissipation. Wayne took this all the way back to Germany, and this was the response (thought I wouldn’t recommend using cigarettes, I can visualise the result):

    “Fact is, that this kind of decentralized are more effective than centralized systems with permanent airflow.

    This is caused by the airflow in the single rooms. With a permanent airflow you will get a more or less “laminar” flow and the air goes straight the way with the lowest pressure drop.

    With cycling fans the flow will change every 70 seconds and the air will flow in a “turbulent” way through the room.

    Just make one simple test:

    If an e² is installed in a living room and another is installed in a sleeping room for example. Just lite a cigarette and have another person in the other room. After a few minutes you can smell the cigarette in the other room.

    If you have a smoker gun (or something similar) just hold It in front of an e². You will see that the air will flow very fast through the whole room.”