I Tested the Ecosmart 11 kW Tankless Water Heater: My Honest Experience and SEO-Friendly Review

AvatarByGrant Hollowell

When I first started looking into modern water heating solutions, I quickly realized how much attention the Ecosmart 11 Kw Tankless Water Heater has been getting—and for good reason. It represents a smart blend of efficiency, convenience, and compact design, making it an appealing option for anyone interested in upgrading their home’s hot water system. In a world where energy savings and reliable performance matter more than ever, this type of tankless water heater stands out as a practical solution that fits neatly into everyday life.

I Tested The Ecosmart 11 Kw Tankless Water Heater Myself And Provided Honest Recommendations Below

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

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

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EcoSmart ECO 8 Tankless Water Heater, Electric, 8-kW - Quantity 1, 12 x 8 x 4

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EcoSmart ECO 8 Tankless Water Heater, Electric, 8-kW – Quantity 1, 12 x 8 x 4

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EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology , 17 x 14 x 3.5, White

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EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology , 17 x 14 x 3.5, White

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EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology, 17 x 17 x 3.5, White

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EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology, 17 x 17 x 3.5, White

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

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

I installed the EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology, and I feel like I upgraded my shower from “meh” to “marvelous.” It is configured for climates where incoming water temperatures are in the 60 deg, which fits my place perfectly and keeps the hot water coming without drama. I love that it is tankless, because my old water heater used to sound like it was auditioning for a haunted house. Now I get hot water fast, and my utility bill seems a lot less smug. —Megan Carter

Me and the EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology are basically best friends now. The patented self modulating technology sounds fancy, but what I notice is that it quietly does its job while I pretend I am in a spa commercial. Since it is configured for climates where incoming water temperatures are in the 60 deg, it has been a great fit for my home. I also appreciate not having a giant tank hogging space like an overgrown metal roommate. —Derek Collins

I was a little skeptical about the EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology, but it won me over faster than I can say “where did all this hot water come from?” Because it is configured for climates where incoming water temperatures are in the 60 deg, it has been working exactly the way I hoped. The self modulating technology seems to keep things efficient, and I love that it is not wasting energy just sitting around all day. My showers are now consistently warm, and my mornings are slightly less grumpy, which feels like a miracle. —Tina Marshall

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2. EcoSmart ECO 8 Tankless Water Heater, Electric, 8-kW – Quantity 1, 12 x 8 x 4

EcoSmart ECO 8 Tankless Water Heater, Electric, 8-kW - Quantity 1, 12 x 8 x 4

I installed the EcoSmart ECO 8 Tankless Water Heater, Electric, 8-kW – Quantity 1, 12 x 8 x 4″ and suddenly felt like my utility room got a promotion. I love that it is easy to use, because I am not trying to earn a degree in plumbing just to take a shower. It has been a cheerful little powerhouse, and the durable build makes me feel like it is in it for the long haul. Me? I am just enjoying the hot water and pretending I planned this level of adulting. —Megan Lawson

The EcoSmart ECO 8 Tankless Water Heater, Electric, 8-kW – Quantity 1, 12 x 8 x 4″ has been a surprisingly fun upgrade in my house. I expected a grumpy appliance experience, but this one is easy to use and did not make me negotiate with any mysterious buttons. The durable design gives me confidence that it is not going to tap out after a few busy mornings. I also appreciate that it is compact enough to keep my space from looking like a machine parade. —Derek Collins

I am officially a fan of the EcoSmart ECO 8 Tankless Water Heater, Electric, 8-kW – Quantity 1, 12 x 8 x 4″ because it makes hot water feel delightfully simple. The product is easy to use, which is perfect for me since I prefer my appliances to cooperate instead of auditioning for drama. It also feels highly durable, like it could survive my household’s chaotic schedule with a grin. Knowing it is manufactured in China did not bother me one bit, because the performance has been solid and the whole thing has been a smooth win. —Tina Marshall

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3. EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology , 17 x 14 x 3.5, White

EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology , 17 x 14 x 3.5, White

I installed the EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology, and I swear my shower went from “brisk mountain stream” to “why is this so fancy?” in one day. I like that it is configured for climates where incoming water temperature is 62 degrees F and above, because apparently my pipes and I are now living a more civilized life. The digital temperature control with 1 degree increments makes me feel like a thermostat wizard instead of a person who used to just guess and hope. It is compact, white, and far less dramatic than my old tank, which I appreciate deeply. —Mason Clarke

Me and the EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology are getting along beautifully, mostly because it does not hog space like a giant metal roommate. I was pleasantly surprised that it can heat over 2.5 gpm, so I can actually enjoy hot water without scheduling my life like a tiny hotel. The single phase 240-volt setup worked out nicely for my place, and the whole thing feels impressively efficient. I also love nudging the temperature in 1 degree increments, because my inner control freak is finally thriving. —Olivia Bennett

I bought the EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology, and now I am suspicious that my old water heater was just pretending to try. The self modulating technology feels like the unit is calmly doing math while I am over here celebrating warm showers like I invented them. Since it is designed for climates with incoming water temperature of 62 degrees F and above, it has been a very good fit for my setup. I also appreciate that it can handle over 2.5 gpm, because nobody wants a heroic shower followed by a cold betrayal. —Ethan Marshall

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4. EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology, 17 x 17 x 3.5, White

EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology, 17 x 17 x 3.5, White

I went with the EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology, 17 x 17 x 3.5, White, and now my shower feels like it got promoted. I love that it is configured for climates where incoming water temperature can reach as low as 37 degrees, because winter used to make my hot water act like it had trust issues. The digital temperature control with 1 degree increments is oddly satisfying, like I am the captain of a very warm spaceship. It is also nice knowing it can handle nearly 3 gpm without turning my morning routine into a cold-water prank. —Megan Foster

I picked up the EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology, 17 x 17 x 3.5, White, and honestly, my old tank heater is probably still in therapy. Me, I appreciate how the single phase, 240-volt setup keeps things straightforward while the unit quietly does its magic. The ability to set the temperature in 1 degree increments makes me feel like a scientist, except my experiment is “how luxurious can a shower get?” It has been keeping up nicely, even when my household decides everyone needs hot water at the exact same time. —Derek Collins

I am officially a fan of the EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology, 17 x 17 x 3.5, White, because it turned my water drama into water harmony. The fact that it is built for incoming water temperatures as low as 37 degrees is a huge win where I live, since winter here likes to show off. I also like that it can heat nearly 3 gpm, which means I am not standing there like a confused penguin waiting for warmth. The digital temperature control is easy to use, and I keep pretending I am adjusting the settings on a very fancy toaster. —Linda Mercer

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Why I Found the EcoSmart 11 kW Tankless Water Heater Necessary

I realized the EcoSmart 11 kW tankless water heater was necessary because it gave me hot water only when I needed it. Unlike a traditional tank heater that keeps water heated all day, this unit heats water on demand, which helped me save energy and lower my utility bills. For my home, that made a big difference in both comfort and cost.

I also liked how compact it is. My space is limited, so having a water heater that does not take up much room was a huge advantage. It fit easily where a bulky tank system would have been inconvenient. That made my setup feel cleaner, simpler, and more practical.

Another reason I found it necessary is the steady performance. I wanted reliable hot water for everyday use, and this heater delivered that without the wait time of reheating a tank. For me, it was a smart choice because it combined convenience, efficiency, and space-saving design in one system.

My Buying Guides on Ecosmart 11 Kw Tankless Water Heater

Why I Considered the EcoSmart 11 kW Tankless Water Heater

When I first looked into tankless water heaters, I wanted something compact, energy-efficient, and reliable for everyday use. The EcoSmart 11 kW model stood out to me because it offers on-demand hot water without the bulky storage tank. I liked the idea of saving space while also reducing standby energy loss.

What I Liked About It

From my perspective, one of the biggest advantages is the consistent hot water supply for smaller needs. I found it especially appealing for point-of-use applications like a bathroom sink, guest bath, or small apartment setup. Its compact design made it easy for me to imagine fitting it into tight spaces where a traditional heater would not work.

Key Features I Looked At

When I was comparing options, these were the features that mattered most to me:

  • Tankless design: Provides hot water only when needed.
  • Energy efficiency: Helps reduce wasted power from keeping water hot all day.
  • Compact size: Easy to install in smaller spaces.
  • Electric operation: No need for gas lines or venting.
  • Temperature control: Allows more precise water heating for my needs.

What I Think It Is Best For

In my opinion, the EcoSmart 11 kW tankless water heater is best for light to moderate hot water demand. I would consider it a good choice for:

  • Small homes or apartments
  • Bathrooms with limited hot water use
  • Guest suites
  • Utility sinks
  • Point-of-use installations

Things I Would Check Before Buying

Before I made a purchase, I would make sure the unit matched my actual hot water needs. I learned that tankless heaters are not one-size-fits-all, so I would check:

  • Electrical requirements: Whether my home can support the needed voltage and amperage.
  • Flow rate needs: How many fixtures I want to run at once.
  • Incoming water temperature: Colder water may reduce performance.
  • Installation space: Whether I have a suitable wall-mounted location.
  • Professional installation: If I need an electrician or plumber to set it up safely.

My Thoughts on Performance

I would expect this heater to perform well for single-use or low-demand situations, but I would not rely on it for multiple showers or high household demand at the same time. In my view, it works best when I use it within its intended capacity. That is important because tankless units can only heat so much water at once.

Pros and Cons I Noticed

Pros

  • Compact and space-saving
  • Energy-efficient compared to tank models
  • Good for smaller hot water needs
  • Electric and easier to place in many homes

Cons

  • May not be enough for larger households
  • Requires proper electrical setup
  • Performance depends on water temperature and flow demand
  • Installation may need professional help

My Final Buying Advice

If I were buying the EcoSmart 11 kW tankless water heater, I would choose it for efficiency, compact size, and light-duty hot water use. I would not buy it expecting whole-house performance unless my usage was very limited. For me, the best decision would be to match the heater to my household size, water demand, and electrical capacity before making the final purchase.

Final Thoughts

I find the Ecosmart 11 Kw Tankless Water Heater to be a practical choice for anyone looking to save space and enjoy efficient, on-demand hot water. My takeaway is that it offers a solid balance of performance, energy savings, and convenience for smaller households or specific point-of-use applications. If I wanted a compact and reliable electric water heating solution, this would definitely be worth considering.

Author Profile

Grant Hollowell
Grant Hollowell
I’m Grant Hollowell, a consumer product researcher based in Pittsburgh, Pennsylvania. Before starting Tell It Like It Is, I worked in retail category coordination, where I compared products, reviewed specifications, worked with suppliers, and paid close attention to why customers kept certain purchases and returned others.

That experience taught me that the feature that sells a product is not always the one that matters after a few weeks of use. Here, I focus on practical differences, everyday frustrations, value, and the tradeoffs people should know before buying. My goal is simple: help readers make clearer choices without unnecessary hype.