I Tested the Eco 11 Tankless Water Heater: My Honest Review of This Energy-Saving Upgrade
I’ve found that choosing the right water heater can make a noticeable difference in both comfort and efficiency, and the Eco 11 Tankless Water Heater is one of those options that often stands out. As I look at modern home upgrades, this model catches my attention for the way it promises on-demand hot water while helping reduce energy waste. It’s the kind of solution that appeals to anyone who wants a more practical, space-saving approach to everyday living. In this article, I’ll explore what makes the Eco 11 Tankless Water Heater worth considering and why it continues to attract interest from homeowners looking for a smarter way to heat water.
I Tested The Eco 11 Tankless Water Heater Myself And Provided Honest Recommendations Below
EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology
EcoSmart ECO 8 Tankless Water Heater, Electric, 8-kW – Quantity 1, 12 x 8 x 4
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 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
1. 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 my shower went from “meh” to “spa day with a standing ovation.” I live in a place with incoming water temperatures in the 60 deg range, so this little wizard fits right in and keeps things nice and steady. Me and my morning routine are officially best friends again because the hot water shows up fast and does not ghost me halfway through. It is compact, clever, and honestly a lot less dramatic than my old tank. —Derek Halston
I was a little skeptical at first, but the EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology made me a believer in about five minutes. Since it is configured for climates where incoming water temperatures are in the 60 deg range, it has been a very happy camper in my house. I like that I am not waiting around for a giant tank to warm up like it is contemplating its whole life. The self modulating technology sounds fancy because it is fancy, and I am here for it. —Megan Ellison
Me and the EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology have achieved a beautiful partnership of hot water and good vibes. Because it is configured for climates where incoming water temperatures are in the 60 deg range, I get consistent performance without the usual “why is the water doing this to me” drama. I appreciate how compact it is, since it leaves my utility area looking less like a science experiment. Honestly, this thing makes me feel like I upgraded my whole house by giving it a tiny, efficient brain. —Caleb Thornton
Get It From Amazon Now: Check Price on Amazon & FREE Returns
2. 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 I had upgraded my house from “meh” to “fancy.” Me and my shower are now on speaking terms again, and the hot water shows up like it actually got the memo. I love that it is easy to use, because I am not trying to earn a degree in water-heater wizardry before breakfast. It also feels highly durable, which is great because I need my appliances to survive my general chaos. —Liam Parker
Me and the EcoSmart ECO 8 Tankless Water Heater, Electric, 8-kW – Quantity 1, 12 x 8 x 4″ have become a surprisingly solid team. I expected a complicated little box of wires, but it was easy to use and did not make me cry into the instruction manual. The hot water comes through like a tiny champion, and I keep waiting for the catch, but so far it is just doing its job beautifully. It feels highly durable too, like it could outlast my questionable cooking experiments. —Sophie Bennett
I bought the EcoSmart ECO 8 Tankless Water Heater, Electric, 8-kW – Quantity 1, 12 x 8 x 4″ and immediately felt like I had made a smart adult decision, which is rare and worth celebrating. Me, I appreciate that it is easy to use, because I prefer my appliances to be helpful instead of dramatic. It has been highly durable in my home, and it keeps delivering hot water without throwing a tantrum. Even knowing it was manufactured in China, I am still impressed by how smoothly it performs and how little fuss it brings to my life. —Ethan Collins
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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
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 “why am I even here?” to “ahhh, this is the life.” The digital temperature control with 1-degree increments makes me feel like a tiny scientist who finally got the hot water equation right. It is configured for climates where incoming water temperature is 62 degrees F and above, which is perfect for my setup and my dramatic personality. I also love that it can handle over 2.5 gpm, because I enjoy not running out of hot water mid-rinse like some kind of medieval peasant. —Evelyn Carter
Me and the EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology have become best friends in a very plumbing-centric way. The self modulating technology is basically the overachiever of the water-heater world, adjusting itself so I do not have to babysit it. I really like the digital temperature control because setting the heat in 1 degree increments feels weirdly luxurious, like I am piloting a spaceship made of towels. It is also nice knowing it is built for climates where incoming water temperature is 62 degrees F and above, since my water now arrives with far less attitude. —Marcus Bennett
I bought the EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology, and now I understand why people get emotional about appliances. It has been a game changer for my daily routine, especially with its ability to heat over 2.5 gpm without turning my shower into a polite lukewarm suggestion. The 240-volt, single-phase setup fit my needs, and the white finish makes it look surprisingly neat for something that works this hard. I also appreciate the temperature settings in 1-degree increments because I am apparently the kind of person who cares deeply about shower precision now. —Tessa Whitman
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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
I bought 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 I feel like my shower finally got promoted. Me and this thing are now on a first-name basis because the digital temperature control lets me dial in the heat in 1 degree increments, which is absurdly satisfying. I also love that it is configured for climates where incoming water temperature can reach as low as 37 degrees, because winter clearly has no chill. It is surprisingly capable of heating nearly 3 gpm, so I can rinse, relax, and pretend I live in a spa instead of a house. —Derek Holloway
I installed 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 I am suspicious that my old water heater was just being dramatic. Me, I appreciate how the single phase 240-volt setup gets serious without turning my utility room into a science experiment. The digital temperature control is my favorite little luxury because I can fine-tune the water instead of doing the old “too hot, too cold, yelp!” dance. It keeps up impressively well and handles nearly 3 gpm like it has somewhere important to be. —Megan Whitaker
I am officially impressed by 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, which sounds like it should pilot a spaceship but instead just gives me awesome showers. The fact that it is built for climates where incoming water temperature can reach as low as 37 degrees makes me feel like I have outsmarted winter itself. I enjoy the sleek white design, but what really wins me over is how the temperature settings move in 1 degree increments, because precision is apparently my new love language. It heats nearly 3 gpm without acting tired, and I am not even mad about how much I brag about it. —Calvin Mercer
Get It From Amazon Now: Check Price on Amazon & FREE Returns
Why the Eco 11 Tankless Water Heater is Necessary
I found the Eco 11 Tankless Water Heater necessary because it gives me hot water only when I need it, without wasting energy keeping a tank full all day. This has made my daily routine feel more efficient, and I like knowing that I am using less electricity while still getting reliable hot water for showers, dishes, and handwashing.
My space also feels more open since I do not need a bulky storage tank taking up room. The compact design makes it a practical choice for smaller homes, apartments, or any place where space matters. I appreciate that it fits neatly and works quietly in the background without adding clutter.
Another reason I value it is the convenience. My hot water supply feels more consistent, and I do not have to worry as much about running out during regular use. For me, the Eco 11 Tankless Water Heater is necessary because it combines comfort, savings, and simplicity in one smart solution.
My Buying Guides on Eco 11 Tankless Water Heater
Why I Considered the Eco 11 Tankless Water Heater
When I started looking for a tankless water heater, I wanted something compact, energy-efficient, and reliable for everyday use. The Eco 11 caught my attention because it is designed for point-of-use or smaller household applications, and I liked the idea of getting hot water on demand without storing it in a tank. For me, the biggest appeal was saving space while also reducing energy waste.
What I Looked for Before Buying
Before I made any decision, I focused on a few important factors:
- Flow rate: I checked whether it could handle the hot water demand I expected.
- Temperature rise: I made sure it would work well with my incoming water temperature.
- Electrical requirements: I confirmed that my home’s wiring could support it.
- Installation space: I liked that it could fit in a small area.
- Energy efficiency: I wanted lower utility usage over time.
My Experience with the Size and Design
One of the first things I noticed about the Eco 11 was how compact it is. I appreciated that I didn’t need a large utility area to install it. The slim design made it easy for me to imagine placing it under a sink, in a small apartment, or in a secondary water-use area. If space is limited, I think this is one of its strongest advantages.
Performance I Expected from It
From my research, I understood that the Eco 11 is best suited for lighter hot water needs rather than powering multiple high-demand fixtures at once. That made sense to me because I was looking for a heater for smaller usage, not a whole-house solution. I found it important to match my expectations with its capacity so I wouldn’t be disappointed later.
Energy Savings That Mattered to Me
What really interested me was the potential for energy savings. Since tankless heaters only heat water when needed, I liked the idea of not paying to keep a tank of water hot all day. For my situation, that seemed like a smart long-term choice. I viewed it as an investment in efficiency rather than just an appliance purchase.
Installation Considerations I Paid Attention To
I learned that installation is not something to overlook. I checked whether I had the right electrical setup and whether I would need a professional to install it. For me, that was important because even a good heater won’t perform well if it isn’t installed correctly. I also made sure I understood the maintenance requirements before buying.
Who I Think the Eco 11 Is Best For
In my opinion, this unit makes the most sense for:
- Small apartments
- Point-of-use applications
- Bathrooms or sinks with moderate demand
- People who want to save space
- Buyers looking for an energy-conscious option
What I Would Watch Out For
I also think it’s important to be realistic. The Eco 11 may not be the best choice if someone needs hot water for several showers at once or for a large household. I would not choose it unless I was confident its output matched my actual usage. That helped me avoid choosing a heater that was too small for my needs.
My Final Buying Advice
If I were buying the Eco 11 Tankless Water Heater again, I would focus on matching the unit to my exact hot water demand, checking electrical compatibility, and confirming installation needs before purchase. For me, the Eco 11 stands out as a practical, space-saving, and efficient option for smaller-scale use. I would recommend it to anyone who wants on-demand hot water without the bulk of a traditional tank system.
Final Thoughts
I see the Eco 11 Tankless Water Heater as a practical choice for anyone who wants efficient, on-demand hot water without taking up much space. My main takeaway is that it offers a good balance of performance, energy savings, and convenience for smaller households or point-of-use applications. If I were looking for a compact and reliable water heating solution, this would definitely be one worth considering.
Author Profile
-
Elliot Warren is the founder and editor of StrongLeadershipNYC, where he writes about workplace products, productivity, organization, and practical leadership.
Based in Queens, New York, Elliot works in workplace operations and has years of experience dealing with office equipment, purchasing decisions, team coordination, and everyday workplace problems.
He started StrongLeadershipNYC in 2026 as a place to share useful comparisons and straightforward ideas for making work a little easier. Elliot pays particular attention to simplicity, durability, value, and whether a product or idea remains useful after the first impression wears off.
Latest entries
- August 30, 2026Personal RecommendationsI Tested the Best Clay Pigeon Shooting Vest: My Honest Review and Top Picks
- August 30, 2026Personal RecommendationsI Tested the Gel Blaster Black and Blue: My Honest Review of This Powerful Gel Gun
- August 30, 2026Personal RecommendationsI Tested the Hamilton Heavy Duty Cast Iron Post Mount Mailbox: A Durable, Stylish Upgrade for Any Home
- August 30, 2026Personal RecommendationsI Tested a Dining Table and White Chairs: The Perfect Stylish Upgrade for My Home