I have the Coverite
http://www3.towerhobbies.com/cgi-bin...?&I=LXB361&P=0 and it seems to hold a pretty constant temp. Drawback – 5 foot cord
The Hangar 9 Proseal
http://www.horizonhobby.com/products...ng-iron-HAN135 has the same type of temp control. Bonus – 12 foot cord