Zehnder Comfosystems ERV Ventilation Units

As our homes become more airtight, there is an increased need to improve the performance of whole house ventilation; with an energy recovery ventilator (ERV), the retention of humidity in winter and the rejection of humidity in summer improves the efficiency by adding latent energy transfer into the calculation.

Humidity has a major impact on the quality of the living environment, potentially affecting the comfort and health of the occupants as well as the fabric of the dwelling itself.

When humidity levels are seen as a potential risk to your high performance properties, consider using an ERV.

Trust Zehnder to provide the solution for the perfect indoor climate.

ComfoAir 160

Zehnder ComfoAir 180


  • Designed specifically for flats and apartments up to 100m2 (2010 Building Regulations)
  • Low energy consumption thanks to EC motors
  • Automatic 100% filtered bypass
  • Constant volume motors ensure guaranteed installed performance (GIP)
  • Can be mounted on either walls or ceilings
  • Has a 100% variable air volume setting
  • Dual-handed unit

Passive House certified performance data - with optional Enthalpy Exchanger (ERV)

  • Air flow rates of 73 – 115 m3/h
  • Heat recovery efficiency of 85%
  • Average moisture recovery ƞx=0.64
  • Power consumption at 100Pa of 0.33 Wh/m3
  • Maximum power consumption with pre-heater of 797W
  • Airtightness and insulation
    • Internal leakage at 1.92%
    • External leakage at 1.45%

Acoustic data

    Airflow m3/h Pa Sound Pressure Level @3m dBa
CA160 Low 57 13 12.0
Mid 103 49 24.0
High 154 105 31.0

What is an Enthalpy Exchanger?

Enthalpy Exchanger

The Zehnder Enthalpy Exchanger is designed to maintain comfortable moisture levels within the home. Too much moisture can lead to mould and overheating. Too little causes dry eyes, chapped lips and an environment in which bacteria and viruses can thrive. The information within this literature will explain how the Enthalpy Exchanger can help to prevent these issues.

What does Enthalpy involve?

The Zehnder Enthalpy Exchanger recovers both thermal and humidity energy from the stale air extracted from wet rooms around the home. This additional humidity energy, which would otherwise have been lost, is transferred into the incoming fresh air stream before being supplied to habitable rooms. Choosing the Enthalpy Exchanger, rather than the standard heat exchanger, means that the unit becomes an Energy Recovery Ventilation (ERV) system, as opposed to solely a Heat Recovery Ventilation (HRV) system.

Enthalpy Exchanger membrane

CASE STUDY - Eastlands in Manchester

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Carbon Emissions

Carbon Dioxide emissions per household have fallen dramatically over the past four decades – from 10.4 tonnes in 1970 to 4.5 tonnes in 2011.