I think any of the commercially-available paint-stripping guns will work.  I always use mine on the high setting, so it wouldn't need a low setting.  And as for how hot it gets, if its lower wattage it might just take you longer to get the wood hot.  I think mine was under $20 but that was a few years ago.  They are sure a handy little item to have when it comes to straightening a stave.