If you are brewing to style then there is typically no orange zest/peel in Hefeweizen. You are confusing that with a Wit. German wheat beers use malted wheat at or above 50% of the grain bill. Belgians typically use unmalted wheat and usually less than 50% of the grain bill and are also characterized by the addition of orange peel and coriander.
But nobody says you have to brew to style. If you want to add zest. It is usually in the last 5-10 minutes of the boil. 1.0 - 1.5 oz per 5 gallon batch
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