Yo guys what's up,

this is a working sauna which I made. If you put an item in the furnace the water will start to boil, the fire will be light up and there will be smoke all over the room & if you take the item out of the furncace everything will be deactivated. If you like it, feel free to use it in your world!

Video Tutorial: https://www.youtube.com/watch?v=mVhRQHqtNnE

note: I made the video in german just because that's my native language, but I'm sure you can still see how to build it, even if you don't understand what I say :D