To comprehend the interactions of microwaves with dielectric materials and their conversion to thermal energy in water, the effect of ions was studied. Water samples with and without inorganic ions were exposed to microwaves in a personalized oven under similar conditions. A significant decrease in the temperature was observed with an increase in the quantity of ions that was directly proportional to the size of the ion. It can be concluded that ionic conduction cannot take place in domestic microwave ovens, rather ions suppress the dielectric polarization and less temperatures are achieved in comparison to dilute aqueous solutions or pure water.