Rheem RETEX-18 18 kW Self-Modulating 3.5 GPM Electric Tankless Water Heater. Condition is "New opened box". Bought new but realized needed upgraded electrical service. The item "Rheem RTex-18 18 kW Self-Modulating 3.5 GPM Electric Tankless Water Heater" is in sale since Friday, December 18, 2020. This item is in the category "Home & Garden\Home Improvement\Heating, Cooling & Air\Water Heaters\Tankless Water Heaters".The seller is "vintagepickerz" and is located in Seattle, Washington. This item can be shipped to United States.