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Small Cabin Forum / Useful Links and Resources / Differences Between HRV and ERV in Your Climate
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# Posted: 5 May 2016 19:47 - Edited by: rockies

Which system is best to use in your climate? HRV's transfer heat from outgoing stale air to fresh incoming air while ERV's transfer both heat and moisture from the outgoing stale air.

Bancroft bound
# Posted: 10 May 2016 17:27

Thanks for the link. Interesting article. I wonder what the power consumption is with these units? Another load to calculate for the Off-grid systems!

# Posted: 11 May 2016 09:10

Bancroft, most of these erv/hrv systems use very little power. They are essentially small fans.

I posted this erv, perfect for small cabins, available at a big box near you (US) for less than 450.

It uses a whopping 6 watts at full flow.

And the cool element of this design is it breathes. So rather than passing stale and fresh air by each other separated by a heat/cool transfer medium; it blows room air out, draws fresh air in. Passing the air through a single ceramic exchanger. This allows the unit to operate more efficiently and, for high humidity summer/very cold winter areas like mine. Hopefully more successfully than a standard ERV. Which isn't recommended for my climate zone (cold weather).

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