As one of its daily deals, Home Depot offers the Ecosmart 24 Electric Tankless Water Heater, model no. ECO 24. for $351.90 with free shipping. That's $87 under our September mention and the lowest total price we've seen. (It's a current low by $138.) It purports to save up to 60% on your water heating costs and features digital temperature control, automatic resettable thermostat, self modulating flow sensor, serviceable elements, and heat exchangers. Deal ends today.