Water and electricity? Hot or Cold? Is hot water or cold water more conductive for electricity or is it the same regardless?
 A: The electrical conductivity of the water depends on the water temperature : the higher the temperature, the higher the electrical conductivity would be. The electrical conductivity of water increases by 2-3% for an increase of 1 degree Celsius of water temperature. Many EC meters nowadays automatically standardize the readings to 25$^{\circ}$C.
While the electrical conductivity is a good indicator of the total salinity, it still does not provide any information about the ion composition in the water.
The same electrical conductivity values can be measured in low quality water (e.g. water rich with Sodium, Boron and Fluorides) as well as in high quality irrigation water (e.g. adequately fertilized water with appropriate nutrient concentrations and ratios).
http://www.smart-fertilizer.com/articles/electrical-conductivity
A: Hot water is not a good conductor of electricity because when water is heated it becomes less impure because of which it dissociates less ions and hence conducts less electricity than cold water
A: Hot water is more conductive than cold water.
