The man in the "WARNING!" video does not seem very bright. He is correct that his device is dangerous. But the problem is his stupid design. The basic idea of building a mini-furnace from flower pots is excellent.
- - He complains that the candles are too close together, causing the wax all to melt. But he could easily have used a bigger saucer and moved the candles further apart.
- - He complains that melted wax could (and did) run down the threaded rod that holds his heater together and ignite. But that wouldn't happen if there wasn't a hole in the saucer.
- - He complains that the threaded rod coming out of the top of the heater gets too hot to touch. Another reason not to build it this way. [Others seem to disagree, based on the number of central rod designs I've seen.]
- - He is using it in a boat, where any passing wave, or the wake from another boat, could cause the melted wax to spill, and maybe ignite.
- - But he continues to use it, having already had a fire.
- - In a Warning Part 2 video he claims that vaporized candle wax can build up inside the flower pots and ignite explosively. I don't know whether that is possible or how likely it might be. But his central rod design has blocked the hole in the larger flower pot, preventing hot gases from escaping. The space between the flower pots functions as a chimney, and the central rod has clogged the opening and created a fire hazard, just like any other clogged chimney.
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There are many videos online about making small heaters like this. There are lots of safe designs, but the usual safety precautions about live flame and adequate ventilation should be followed.
