How much does it cost to operate a steam room? Customer Support February 02, 2021 21:55 Updated around 15p per hour, however, it's recommended that you only steam for around 20 minutes. Related articles How strong is the tray? Can I use any essential oil in the system? Why have I got brown water coming out of the Steam Generator? What is a steam shower? Are the shower fittings chrome or chrome coated? Comments 0 comments Please sign in to leave a comment.