In the example you gave, all of the offspring will be het. When they are the offspring of a visual specimen of a recessive morph, they are guaranteed to be het.

You get possible hets (phets) when you do not have a visual specimen. For example, I have some het albinos. When I bred them together, I will expect to get 25% visual albinos, 50% het albinos, and 25% normals. Since there is no way to know which are the hets and which as the normals, they will all be considered 66% phets. If you breed a het to a normal, you will get 50% hets and 50% normals. Again, you can't tell the difference so they are considered 50% hets.