Where can Hydromx® be a benefit? October 14, 2021 By Hydromx® is a new category of Energy Efficiency product that applies to Commercial and Domestic heating and cooling systems and to Industrial applications where more efficient heat transfer is of benefit. Hydromx® is an energy saving solution that is mixed with water in a ratio of 50:50 and used in heating and cooling systems to improve heat transfer and reduce energy consumption. Hydromx® can be used in all water based (hydronic) heating and cooling systems as a heat transfer medium (excluding steam based systems).