What would be more efficient, using a 120V microwave to heat water or to use a 220V electric stove to heat water? The reason I ask is because resistive heating is generally not as efficient as the microwave when it comes to heating water. Microwave ovens are most efficient at heating water and since they emit little heat, all the energy being directed is used to heat the water unlike in a stove where it heats the coils, which heats air that heats the pot which heats the water. Maybe I should put thermal paste on the stove to improve efficiency. 