According to the literature “New International Formulation for the Thermal Conductivity of H2O”, the thermal conductivity of water at 20 °C is 0.598 W/m·K.
Does water have a high conductivity?
Apart from liquid metals, water has the highest thermal conductivity of any liquid. The heat conductivity of water is high because ions are increased due to the increase in temperature therefore the conduction also increases.
Thermal Conductivity of water of different quality
Presented data are average values from six repeated tests on each sample. Standard deviation is close to 0 %.
Reference: https://thermtest.se/thermal-conductivity-of-water
