Can the HOTTAP be used inside? Maciej Slodyczka June 21, 2017 02:45 Updated Follow No! The HOTTAP must be used outdoors and in a well ventilated area. Please refer to your User Guide for the appropriate setup. Related articles Can I permanently install the HOTTAP or can I use it on a Bus or Motorhome Conversion? HOTTAP User Guide Can I use the HOTTAP on my River Boat, and can I attach it to my existing plumbing? Comments 0 comments Please sign in to leave a comment.