description EcoSmart ECO 18 Overview
The EcoSmart ECO 18 is an electric tankless water heater designed to heat water on demand without a storage tank. It uses self-modulating control to regulate electrical power in response to flow and incoming-water conditions, with performance depending strongly on the required temperature rise. The unit is intended for residential applications where the electrical service, wiring, breaker capacity, groundwater temperature, and simultaneous hot-water demand meet its installation and output requirements.
help EcoSmart ECO 18 FAQ
Is the EcoSmart ECO 18 a tank water heater or a tankless unit?
The ECO 18 is an 18-kilowatt electric tankless water heater, so it heats water as it flows and does not store a tankful of hot water. It runs at 240 volts and uses self-modulating control to adjust power to demand. [EcoSmart ECO 18](https://www.ecosmartus.com/product/ecosmart-ECO-18-18-kW-Electric-Tankless-Water-Heater)
What electrical panel does the ECO 18 need?
EcoSmart lists a maximum draw of 75 amps, two dedicated 40-amp double-pole breakers, and a recommended 150-amp household service. It also specifies two runs of 8 AWG wire, so the existing panel should be checked before purchase. [EcoSmart electrical requirements](https://www.ecosmartus.com/support/electrical-requirements)
How many showers can the ECO 18 run at the same time?
There is no single answer because performance depends strongly on groundwater temperature and the desired temperature rise. EcoSmart's table ranges from about 1.8 GPM in its coldest zone to 4.4 GPM in its warmest zone at a 105 F set point. [ECO sizing sheet](https://files.myrheem.com/webpartnerspublic/Documents/Files/ECO%2024%20SPEC%20SHEET2024-04-17.pdf)
What are the ECO 18's size, activation flow, and warranty?
The unit measures about 17 inches high by 14 inches wide by 3.635 inches deep, activates at 0.3 GPM, and weighs 11.7 pounds. EcoSmart lists a limited lifetime warranty with registration, and no gas venting is needed because the heater is electric. [EcoSmart ECO 18](https://www.ecosmartus.com/product/ecosmart-ECO-18-18-kW-Electric-Tankless-Water-Heater)
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