Homemade electric water heater. Take a look tell me what you think?

OK so I recently acquired a massive (19″di x 45″ wide) roll of fiberglass! My brother, sister, and mother would all like me to construct a hot tub! I’m very mechanically inclined so I said sure! In-line water heaters are super expensive… So I figure why not get an electric water heater element, coil some coper tubing around it (not touching,) and incase the whole thing inside a welded metal box which then gets filled with some sort of oil! The real thing would be a bit more complicated but you get the idea! Anyhow… My question is this, would the oil inside expand like boiled water would? Thus the potential for an explosion? If not then I’m a go!!! What type of oil would be best? I was thinking vegetable? Maybe even fryer oil?

Sounds like a formula for a good explosion. Nothing you make will be very efficient…..

Neil Tyburk, Engineering Design Chief Reviews the New EdenPURE GEN4 Heater

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