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Energy recovering ventilation

An ERV provides whole-home ventilation.

  • heat recovery, just like an HRV system,
  • controls humidity.
    The difference with an HRV: an ERV also takes the humidity out of the outgoing air and puts it into the incoming air. ERVs tend to hold on the moisture in the air.

Warning

ERV is usually not recommended in the UK because

  • it maintains humidity, usually MVHR is meant to reduce indoor humidity
  • it costs more than MVHR

from wiki:
An ERV is a type of air-to-air heat exchanger that transfers sensible heat as well as latent heat. Because both temperature and moisture are transferred, ERVs are described as total enthalpic devices. In contrast, a heat recovery ventilator (MVHR / HRV) can only transfer sensible heat.

  • all ERVs are HRVs, but not all HRVs are ERVs.
  • In the UK, MVHR will be more effective than ERV.

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