Immersion water heater in a metal cup

[thomas01]

I am creating a non-profit product for charity and I have a simple electrical question.

In this product a single cup immersion water heater will go inside a stainless steel cup. So the heater will be touching the metal cup. But I am going to have a plastic safety cover that goes over the metal cup, so someone can not touch the water or metal.

Does this sound safe enough to sell to the public? Or is there anything else that might be a problem?

Thanks so much for any advice.

ps: I live in Thailand, so it might take me a while to answer any questions, cause of the time difference.

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