Yes, stove top wax rendering is dangerous. Fine filtering rendered wax in the oven is fine. I always used a double boiler outside until I made a steam wax melter. The problem with solar is they only work okay here in the peak of summer when I don't have much wax to clean. Steam wax melters are too expensive for what you get, same with solar wax melters if you don't build them yourself. I'm sorry I didn't build a steam wax melter in my earlier years, it works great, and you can render a lot of wax quickly.
