Zehnder’s retrofit MVHR systems are now available in the UK.
As such they lend themselves ideally for retrofitting MVHR systems.
Key parameters:
– Balanced single room MVHR (PH certified)
– 15 – 50 m3/h (4.2 – 13.9 l/s) output
– One 340mm core through external wall needed
– For 335 to 900mm thick walls
– ERV core (heat & humidity recovery)
– Humidity, CO2 and VOC control possible
– Quiet operation
The ComfoSpot 50 can switch between 4 fan speed settings::
| Fan speed | Volume flow | Volume flow | Thermal efficiency | Humidity recovery | Power cons. | Noise level |
| [m³/h] | [l/s] | [%] | [%] | [W] | [dB(A)] | |
| 1 | 15 | 4.2 | 85 | 74 | 4 | 5.2 |
| 2 | 25 | 6.9 | 76 | 58 | 6 | 14.7 |
| 3 | 40 | 11.1 | 69 | 46 | 10 | 23.2 |
| 4 | 50 | 13.9 | 62 | 44 | 15 | 29 |
Key features:
– Can be connected with one 90mm supply duct and one 90mm extract duct to connect one additional supply and extract room.
– 15 – 60 m3/h (4.2 – 16.7 l/s) output
– One 270mm core through external wall needed
– For 275 to 900mm thick walls
– ERV core (heat & humidity recovery)
– Humidity, CO2 and VOC control possible
– Quiet operation – even quieter with supply ducting and extract ducting
The ComfoAir 70 can switch between 4 fan speed settings:
| Fan speed | Volume flow | Volume flow | Thermal efficiency | Humidity recovery | Power cons. | Noise level no ducting |
Noise level 1 duct |
Noise level 2 ducts |
| [m³/h] | [l/s] | [%] | [%] | [W] | [dB(A)] | [dB(A)] | [dB(A)] | |
| 1 | 15 | 4.2 | 90 | 84 | 4 | 11.0 | 9.2 | 2.9 |
| 2 | 25 | 6.9 | 83 | 73 | 5 | 23.6 | 16.3 | 16.0 |
| 3 | 40 | 11.1 | 76 | 61 | 9 | 29.4 | 24.3 | 16.2 |
| 4 | 60 | 13.9 | 71 | 54 | 17 | 36.4 | 31.2 | 22.7 |
Passivhaus deemed to satisfy UK NZCBS The Passivhaus standard is now deemed to satisfy certain aspects of the UK Net Zero Carbon Buildings Standard (UK…
Scottish Homebuilding & Renovating Show Glasgow PAUL Heat Recovery is exhibiting at the SEC in Glasgow on the 9th and 10th May 2026. Please visit…
Big Magic Installer Training May 2026 PAUL Heat Recovery hosts a product training event for the Big Magic MVHR system on Thursday 7th May 2026…
Launch of the UK Zehnder Academy As Approved Zehnder Partner we were invited for the official launch of the UK Zehnder Academy in Camberley on…
Please see here for performance and technical details.
See here for filter changes and maintenance of the CS50 and CA70.
The bluMartin freeAir 100 is a quite powerful de-central MVHR, that can also be used as Cascade MVHR.
Renovating an existing home or extending it. Please see here for some important information.
Find our more about MVHR systems, their advantages and disadvantages and how they can be implemented.
