Er, yes. Short answer: "step away from the Aga". : )
When we first had a bit of wax to melt down, I used our Rayburn to try and melt it. It is very hard to control the temperature precisely enough, and it goes everywhere. Cleaning down the Rayburn after "containment failure" is a job I never want to do again.
Solar extractor all the way. At least you can clean those outside with a hose.