Marey 240V Electric Tankless Instant Electric Water Heater 5.5 GPM 21kW ECO210 Smart technology that avoids the excess temperature waste to any hot water point of use Excellent post-sales service & 5 years warranty Compact and Powerful Unit in an all New Stainless Steel Finish Min. Water Flow to Activate the Unit: 0.85 GPM Saves water and up to 60% less electricity than conventional tank water heater, making it cost-effective and environmentally friendly Corrosion resistant Heating Elements, reduces hard water build up due to Chlorine and Calcium.