Product review (4 stars): Strong
I have always thought that anything portable would be weak - not have the cooking heat (BTU?) to throw out a lot of power...  I was wrong.

My wife asks that if I'm making some things - Carolina BBQ sauce - I do it outside because it can smell up the kitchen.  I put this thing on it's 2nd to lowest setting and it had the vinegar boiling in no time...  I didn't want it to boil - but that's my fault...  The cook-top gets hot and gets hot FAST.