ComfoAir 350 ERV Unit with optional Pre-Heater

ComfoAir 350 Ventilation Unit with optional Pre-Heater

Brand: Zehnder
Product Code: 9246-01 or 9247-01 (left or right)
Weight: 73.00lb
Dimensions: 23.00in x 25.00in x 34.00in

Price: $2,915.00

Available Options

* Add a Pre-Heater:

The pre-heater is built into the unit and prevents frost in the core during extreme low temperatures. When an earth tube or ground loop is incorporated, the pre-heater may not be needed in the Rocky Mountain regions. Otherwise, most units should add this option.

The primary residential ventilation unit for average sized homes (~3-4 bedrooms and 3 baths), the CA 350 has a maximum capacity of 218 cfm.

Certified by the Passive House Institute at 84% efficiency, the CA 350 is listed with HVI as 87% Sensible Recovery efficiency and 93% Apparent Sensible effectiveness (both at 50Pa) and features ECM motors for energy efficiency and ease of balancing, summer by-pass cooling, frost protection mode, and resistance pre-heater and enthalpy core. Additional options and accessories also available. 


  • Comfort ventilation up to 218 cfm without unpleasant drafts
    Heat recovery with an efficiency of 84%
    Moisture recovery with the Zehnder enthalpy exchanger
    Low power consumption thanks to DC motors
    Automatic summer bypass
    Frost protection function
    Quick, safe installation and servicing
    Simple, quiet operation with MERV 7/8 quality filters (MERV 13 optional)
    Integrated preheater and humidity control 
    Can be coupled with geothermal heat exchanger
    Integrated controller for geothermal heat exchanger 
    Filter replacement indicator
  • Electrical and hydronic post-heater integration possible
    Small minimum air volume as low as 29 cfm, specifically designed for single family houses
    Digital Ease control unit
    CO2 control (optional)
  • Relative Humidity Control (optional)
  • The CA 350 is a Certified Passive House Component.


Dimensions:Height: 33.9”

                        Width: 24.6”

                        Depth: 22.5”

Weight: 77.2 pounds (35kg)

User Manual

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