Can I use the SteriPEN in very hot water, above 120 degF/60 DegC? Ainsworth Kohler November 08, 2016 11:14 Updated Follow No. The SteriPEN should not be used in very hot water because the plastic on the SteriPEN may become damaged. Related articles Can I use the SteriPEN in freezing temperatures Will SteriPEN be effective in water from any country? Where may I find my SteriPEN's serial number? Does SteriPEN work in snow-melt waters? The Origional Steri-Pen Comments 0 comments Please sign in to leave a comment.