An electric tankless heater can save floor area, limit standby heat loss, and supply hot water during active use. This calculation matters more than storage volume, because tankless systems hold no reserve. Electrical CapacityMany electric tankless systems require dedicated circuits, larger conductors, and sufficient panel space. Efficiency and CostsElectric tankless systems reduce standby loss because heating occurs during active demand. ConclusionBuying an electric tankless heater should begin with measured demand, electrical review, and local temperature data.