A. O. Smith’s Signature Series 240 Volt 18 Kilowatt 2-Chamber Tankless Electric Water Heater can provide you with continuous hot water for up to 1 shower and 1 sink (sink and shower calculations are based on a 0.5 GPM faucet and a 2.5 GPM showerhead in the southern zone) when sized appropriately. This makes it a good match for applications such as cabins, apartments and small homes. Our Tankless Electric water heaters only heat water when needed, leading to potential energy and money savings. Additionally, our Tankless Electric water heaters are wall hung, saving you valuable storage space. Tankless Electric water heaters typically require greater electrical supply capacity than standard tank-type models. Please ensure your home’s power supply can support this model and that you have enough space in your breaker panel. A. O. Smith’s Tankless Electric design includes a soft start to produce a softer electric draw when powering on, reducing light dimming. This model requires 240 volts, 75 amps, 2 x 40 amp double pole breakers and #8 AWG wire size. Not sure if this is the right water heater for you? Professional installation is reR9commended.