Healing Ward AoE Circle Size

I'm making an AoE spell which is based off healing ward as the dummy spell. The Final spell should have variable radii depending on the level. Changing the AoE of the base dummy healing ward spell does NOT change the size of the AoE circle when you cast the spell. :(

Any ideas? Would it work with other AoE spells? Why doesn't it work with healing ward (which would save me the time to create a dummy unit since it is already summoned by that spell)?

The answer to your problem is rather simple: The AoE of the healing ward spell is just informative, so the player can see the AoE of the spell when he casts it; it is the healing ward's "healing aura" ability that has the actual AoE of the healing. If you want to have multiple levels of the spell with different ranges, you have to make a different healing ward for each level, and give to each of them a different healing aura.

Thanks for the reply, but that wasn't my problem. I know that the effect and therefore the radius comes from the ward aura...

This is solely about the radius of the targeting circle. As far as I know it's not dependant on the type of the unit the spell summons.