Another point about slow cookers - they don't all bring the contents to boiling point. so could be dangerous for re-heating.
I've discovered mine is like that, so now I cover it with a towel and this seems to bring it up to bubbling if necessary.
I use it mainly for stews and often add dumplings towards the end which need the fluid to be at boiling point.
Have any of you got all electric cars? Pros and cons please.