Modding rice cooker to increase "keep warm" temperature

The whole cooker unit is designed to run hotter than that in the cooking (non-keep-warm) phase, so presumably your concerns should be localised to near that modified part.  It looks like it's made of mica (like an electric toaster element) but beyond that I don't know.  How brightly did it glow before the mod?  Is it possible to recreate that?

Is the "keep warm" heater the same as the cooking heater though? OP: I assume there are two separate heaters in this thing?
I agree I would go back to the unmodified state and take measurements there first.

If there are two heaters and this is only used for keep warm, the "correct" mod would be to add more heater filament in parallel with the existing heater. This way you know that the filament won't be overloaded. But even then.. I don't know if I would consider it if I can find another cooker for cheap. Apparently to be safe for extended time periods, keep warm should be at 60C, as you are aiming for.

I'm confused, how did you determine there is a PTC? Are you showing it in the photo? To me it just looks like a nichrome heating wire as moffy says.Is the "keep warm" heater the same as the cooking heater though? OP: I assume there are two separate heaters in this thing?I agree I would go back to the unmodified state and take measurements there first.If there are two heaters and this is only used for keep warm, the "correct" mod would be to add more heater filament in parallel with the existing heater. This way you know that the filament won't be overloaded. But even then.. I don't know if I would consider it if I can find another cooker for cheap. Apparently to be safe for extended time periods, keep warm should be at 60C, as you are aiming for.

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