A. Unfortunately low amperage/wattage doesn't produce much "instant" heat (no matter what). The elements that we offer are almost 100% efficient (meaning that almost all of the heat that an electric element produces is already transferred into the water). You simply can't buy any brand (anywhere) of tankless water heater that uses less than 15 amps at 110volts that will give you much of a heat rise. We wish it possible as we would be able to sell many more electric tankless water heaters. If you only have 110-120 volts you might wish to consider using a small water heater instead of a tankless heater. Just click here to see those.