[kscarrol]

^ I have no data to dispute this but it sounds like you're going on a hunch as well. I have to think my tankless gas heater is more efficient at heating water than an electric heating element in my dishwasher. The offset of course is running the hot water for 30 seconds before starting the dishwasher! Ultimately the dishwasher is connected to the hot water line and is going to demand hot water, activating the tankless anyway so I imagine any cost difference is quite small...