However, it has a very low heat capacity, and tends to leak out of collectors, ducts, and dampers. Water is non-toxic and inexpensive. It has a high specific heat, and a very low viscosity, making it easy to pump. Unfortunately, water has a relatively low boiling point and a high freezing point. Make sure that no toxic dyes or inhibitors have been added to it.
Most glycols deteriorate at very high temperatures.
You must check the pH value, freezing point, and concentration of inhibitors annually to determine whether the mixture needs any adjustments or replacements to maintain its stability and effectiveness. Hydrocarbon oils have a higher viscosity and lower specific heat than water. They require more energy to pump. These oils are relatively inexpensive and have a low freezing point. The basic categories of hydrocarbon oils are synthetic hydrocarbons, paraffin hydrocarbons, and aromatic refined mineral oils.