There have been a lot of question about the efficacy of ozone in warm/hot water. Yes – ozone does work in hot water! See the supporting documentation below.
Ozone Works in Hot Water

R.N. Kinman (1975) & E. Katzenelson, et al. (1974) reported “As temperature increases, ozone becomes less soluble and less stable in water; however, the disinfection and chemical oxidation rates remain relatively stable. Studies have shown that although increasing the temperature from 0 to 30 deg C can significantly reduce the solubility of ozone and increases its decomposition rate, temperature has virtually no effect on the disinfection rate of bacteria.”
In other words, the disinfection rate was found to be relatively independent of temperature despite the reduction in solubility and reduced stability at higher temperatures. Read more...