What's the best way to paint radiators?

I've got this old house, with radiators and their peeling paint. Some have many layers of peeling paint, and others are a little less so but still ugh. Obviously since they are heating units, the paint has to be able to withstand the heat, not crack more, and not be affected by the peeling paint underneath, unless there is some manner of removing the paint that doesn't involve hours and hours of sitting there as it flakes off. Suggestions? Things that don't work?
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