Today Only: Save up to 41% on EcoSmart Electric Tankless Water Heaters at Amazon! Posted on December 2, 2018 by Jeri Update: Deal over. Today only, Amazon has EcoSmart Electric Tankless Water Heaters on sale at their lowest ever on Amazon! EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology: $161.28 (Was $214.97) EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology: $334.85 (Was $451.47) Share the love: