EcoSmart ECO 18 Electric Tankless Water Heater – 18 kW, 240V, Self-Modulating Technology

Efficient hot water on demand for modern homes

The EcoSmart ECO 18 delivers hot water exactly when you need it. This compact electric tankless unit uses self-modulating technology to adapt heat output to match demand, helping to reduce energy use while keeping comfort high.

Key capabilities for warmer climates

Configured for environments where incoming water temperature is 62 °F or higher, the ECO 18 can heat more than 2.5 gallons per minute. In practical terms, you can run a shower head at 1.5 gpm while using a sink when temps are favorable.

In milder or warmer regions, two showers can run simultaneously when incoming water is above about 70 °F, making it suitable for shared homes or apartments.

• 18 kW heating capacity at 240V
• Self-modulating technology scales energy use with demand
• Digital temperature control in increments of 1 degree
• Single phase, requires two 40A double-pole breakers
• Two 8 AWG wires provided for hookup
• Compact footprint measures 17 x 14 x 3.5 inches

Installation and daily use

The ECO 18 is designed for wall mounting in tight spaces, delivering reliable hot water while keeping the cabinet clean and simple. A digital control lets you dial in your preferred temperature with precision and ease.

Before purchasing, verify your electrical capacity and hot water needs to ensure the model matches your home. The unit is best suited for households with moderate simultaneous demand and climates where the incoming water is reasonably warm.

• Space saving white exterior that blends with most utility areas
• Simple electrical hookup for a straightforward install

Real-world use and benefits

Users report quick hot water response and consistent comfort without typical standby energy losses. The self-modulating design may help tailor energy use to actual demand, potentially lowering operating costs over time.