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I think you may be right, I read a HN comment a long time ago saying that they had a heater but it seems they do not.

They have it.

This is from the official docs [1]: Snow Melt Capability: Up to 25mm / hour (1 in / hour)

They do have a heater in some versions - uses another 30-50 watts and is for melting snow.

It's just running the chips hot.

I guess any sufficiently inefficient computer is indistinguishable from a space heater.

I thought it was for comforting cats.