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EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology

TLDR Review: EcoSmart ECO 11 Water Heater

By ShopSavvy Team

Published: July 5th, 2026

Pros

•Small size and lightweight design make it easy to install in tight spaces.
•Energfficient due to patented self-modulating technology, reducing electricity bills.
•Capable of providing hot water for one shower in cold climates or two in warmer regions.
•Weluited for small households, supporting multiple fixtures with better pressure.
•Consistently heats water quickly and maintains temperature with manual adjustments.
•Provides continuous hot water without the risk of running out like traditional tanks.
•Backed by a limited lifetime warranty, offering reassurance for residential use.
•Simple electrical requirements allow for straightforward installation if you’re familiar with wiring.
•Looks sleek and unobtrusive, fitting into various locations easily.
•Good value for the price compared to larger or traditional water heating options.

Cons

•Installation typically requires a professional electrician and plumber, increasing upfront costs.
•Demands a dedicated 6mp double-pole breaker and #6 AWG wiring; not suitable for standard wiring setups.
•Can produce a humming noise and electrical interference, especially affecting nearby induction appliances.
•Limited flow rate at higher temperature rises; may struggle with simultaneous multiple hot water demands.
•Some users reported temperature fluctuations during usage, especially with fluctuating water pressure.
•Might not be suitable for larger households or multiple bathrooms due to flow limitations.
•Requires careful attention to proper connection installation; leaks can occur if washers and fittings are overlooked.
•Installation cost can be significant, averaging around $50$700.
•Water temperature can drop if other fixtures are used simultaneously, requiring manual adjustments.
•May experience issues with scale buildup over time, though installing a filter can help mitigate this.

Bottom Line

The EcoSmart ECO 11 is a solid choice for small households or individual use, especially if space and energy savings matter. It offers reliable, on-demand hot water with an easy-to-spot size, making it a convenient upgrade from traditional tank heaters. However, it’s best to be prepared for professional installation and to ensure your electrical system can support its requirements. If you need a solution for larger households or multiple bathrooms, you might want to explore higher-capacity models or those with a greater flow rate.

Lowest at Amazon

$199.99 at Amazon

How we researched this

About this review: We pulled together findings from professional reviews and hundreds of user reviews, and cross-referenced them with ShopSavvy's pricing data from 103 retailers to give you the short version.