The EcoSmart ECO 11 Electric Tankless Water Heater is pretty energy-efficient, especially if you're using it for smaller tasks or in a warmer climate. Our research shows that it can handle up to 2.0 gallons per minute, which is perfect for a single shower or sink where the incoming water isn't too cold.
In colder climates, though, it might have some challenges. The manufacturer suggests that when the incoming water is colder, you might find it can't handle more than one fixture at a time. So, if you live somewhere really chilly, running a shower and sink together could stretch its capabilities, resulting in less hot water.
You'll need to make sure you've got the right setup for it to work efficiently. That means a 60 amp breaker and 6-gauge wiring are a must. Our research also points out that regular descaling and cleaning can keep it running smoothly.
All in all, the EcoSmart ECO 11 is great for small homes or specific uses, like a low-flow showerhead.
It's compact and does a good job conserving energy and space. Just keep in mind that if you have higher hot water needs or live in a cooler area, this unit might require a bit of consideration to see if it fits your needs.
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How we researched this
Where this comes from: this answer draws on the product's published specifications and the reviews ShopSavvy collected for it, alongside prices from 2 retailers in ShopSavvy's price data, most recently seen Aug 18, 2026.
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