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They don't say specifically, but my guess is that they use a mineral oil is because it is cheap and non-toxic. There are also many synthetic diathermic heat transfer fluids that have better performance, but these are more expensive. Glycols are also used in some moderate temperature applications such as radiant heating systems in floors and walls, but I doubt they are used in something as hot as a space heater (the total power dissipated by a space heater may be less than a house radiant heating system, but the peak temperature of a space heater's internal electric heating wire is higher).

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