Delonghi 5 fin 700/800/1500w, oil filled heater.
It sounds like you have a lemon. The heat exchanger tube has developed a hole somewhere. These things are designed for the small element inside to heat up the oil, and that is supposed to radiate the heat. It would be dangerous to use without any kind of oil. The element would burn out hopefully before it started a fire, but not necessarily. I don't know what kind of oil they use, but its a thin viscosity, like some turbine oil. You can patch the hole and try some pump oil or something, but I personally don't think its a good idea. I wouldn't do it.
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