THHN Wire for Hot TubsDec 28, 2012 Many of our customers purchase 6 AWG THHN Wire for Hot Tubs. We would like to give a big shout out to Rob in Oklahoma for sending in these pictures of him at work installing his hot tub. THHN/THWNShare: Posted in Customer ProjectsNEXT →Welding Cable & Wind TurbinesRelated Posts Wire & Cable to Run 100 AMP Outdoor Service to Shed Choosing between THHN & XHHW wire 6 AWG THHN/THWN Building Wire For a 220V Hot Tub