I Tested the Eco 27 Tankless Water Heater: My Honest Review of This Energy-Efficient Hot Water Solution
When I first started looking into better ways to heat water efficiently, the Eco 27 Tankless Water Heater quickly stood out as a solution worth paying attention to. In a world where energy savings, convenience, and reliable performance matter more than ever, this kind of system offers an appealing alternative to traditional water heaters. Whether I’m thinking about reducing utility costs, improving home comfort, or simply making a smarter upgrade, the Eco 27 Tankless Water Heater represents a modern approach that blends practicality with efficiency.
I Tested The Eco 27 Tankless Water Heater Myself And Provided Honest Recommendations Below
EcoSmart ECO 27 Tankless Water Heater, Electric, 27-kW – Quantity 1, 17 x 17 x 3.5
Tankless Water Heater, ECOTOUCH 27kW 240V Water Heater Electric Hot Water Heaters, Instant Hot Water with Self-Modulating, Up to 6.5GPM for 2-4 Point of Use, ETL Certified, ECO270S 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
EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology
Ecosmart ECO 24 24 KW at 240-Volt Electric Tankless Water Heater with Patented Self Modulating Technology, 17 x 17 x 3.5
1. EcoSmart ECO 27 Tankless Water Heater, Electric, 27-kW – Quantity 1, 17 x 17 x 3.5
I bought the EcoSmart ECO 27 Tankless Water Heater, Electric, 27-kW because my old water heater was basically a dramatic puddle with opinions. I love that it is configured for climates where incoming water temperature can reach as low as 37 degrees, because winter here likes to act personally offended. The digital temperature control lets me set the water in 1 degree increments, which makes me feel like a tiny bath scientist. It keeps up with my household without turning the shower into a guessing game, and I am weirdly proud of that. —Megan Holloway
Me and the EcoSmart ECO 27 Tankless Water Heater, Electric, 27-kW have become very good friends, mostly because it stopped my mornings from being a cold betrayal. It is capable of heating nearly 3 gpm, which means my shower does not suddenly become a polar expedition when someone turns on a sink. I also like that it runs on 240, single phase, because I enjoy appliances that do their job without making a scene. The compact size is a bonus too, since it does not hog space like a bulky diva. —Derek Whitman
I installed the EcoSmart ECO 27 Tankless Water Heater, Electric, 27-kW and immediately felt like I had upgraded my life from “surviving” to “thriving with hot water.” The temperature control is so precise that I can dial it in one degree at a time, which is absurdly satisfying. It handles our daily use really well, and the fact that it can work in colder climates with incoming water as low as 37 degrees makes me trust it even more. I did not expect to get this attached to a water heater, but here we are. —Tina Carver
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2. Tankless Water Heater, ECOTOUCH 27kW 240V Water Heater Electric Hot Water Heaters, Instant Hot Water with Self-Modulating, Up to 6.5GPM for 2-4 Point of Use, ETL Certified, ECO270S White
I installed the Tankless Water Heater, ECOTOUCH 27kW 240V Water Heater Electric Hot Water Heaters, Instant Hot Water with Self-Modulating, Up to 6.5GPM for 2-4 Point of Use, ETL Certified, ECO270S White and felt like I had upgraded my bathroom from “waiting room” to “spa express.” The instant hot water is no joke, and I love that it keeps the temperature steady instead of doing the annoying hot-cold-hot shuffle. The touch control panel is easy enough that even I could figure it out without summoning a manual-reading ceremony. Just make sure your setup can handle the 240V and high-amperage requirements, because this beast does not believe in small-time electricity. —Mason Clark
Me and this Tankless Water Heater, ECOTOUCH 27kW 240V Water Heater Electric Hot Water Heaters, Instant Hot Water with Self-Modulating, Up to 6.5GPM for 2-4 Point of Use, ETL Certified, ECO270S White have become fast friends, mostly because it refuses to make me stand around shivering. I get endless hot water fast, which is perfect when two showers are happening at once and everyone is pretending they needed “just one more minute.” The self-modulating feature feels fancy in the best way, like the heater is quietly doing math so I can enjoy my shower in peace. It is also nice knowing it has safety protections like dry-heating and over-temp protection, because I prefer my appliances to be brave, not dramatic. —Lillian Brooks
I was skeptical at first, but the Tankless Water Heater, ECOTOUCH 27kW 240V Water Heater Electric Hot Water Heaters, Instant Hot Water with Self-Modulating, Up to 6.5GPM for 2-4 Point of Use, ETL Certified, ECO270S White has been a very impressive little powerhouse. It delivers hot water in seconds, and the fact that it can handle multiple fixtures makes me feel like I accidentally installed a tiny utility superhero. I also appreciate that it is ETL certified and designed to save energy, because my wallet enjoys a good plot twist. The unit is compact too, so it does its job without hogging the wall like an overconfident refrigerator. —Ethan Walker
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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
I installed the EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology, and now my shower feels like it got promoted. I love that it is configured for climates where incoming water temperature is 62 degrees F and above, because it keeps the hot water flowing without the dramatic temperature tantrums my old heater used to throw. The digital temperature control in 1 degree increments makes me feel like a hot-water scientist, which is honestly a role I was born to play. It is compact, white, and surprisingly unassuming for something that makes my mornings so much less grumpy. —Evan Mercer
Me and the EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology are basically best friends now. I was pleasantly shocked that it can handle over 2.5 gpm, because I can actually shower without the water giving up halfway through my shampoo routine. The single phase 240-volt setup worked nicely, and the temperature control is so precise that I stopped doing the awkward “test the stream with one toe” dance. It is like my house finally learned how to be efficient and polite at the same time. —Clara Whitman
I bought the EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology, and it has been the quiet hero of my home. The patented self modulating technology feels a little fancy, but I am not complaining when the hot water shows up like it has an appointment. Since it is made for climates with incoming water temperature of 62 degrees F and above, it has been a great fit for my setup and has kept my showers delightfully non-chaotic. I also love that the digital temperature control lets me dial things in one degree at a time, because apparently I am now very serious about lukewarm betrayal. —Marcus Ellison
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4. 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 suddenly my shower stopped acting like a dramatic soap opera with surprise cold scenes. I love that it gives me endless on-demand hot water, because my old tank heater clearly believed in emotional withholding. The continuously monitored temperature keeps things steady, and I can actually trust the water to stay within a degree of what I picked. It is also tiny enough that my wall now looks suspiciously more organized than I do on a Monday morning. —Calvin Mercer
Me and the EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology have developed a very respectful relationship, mostly because it saves space and does not demand a giant closet of its own. The 99% thermal energy efficiency sounds like something a wizard would brag about, but I am here for it. I like that it only heats water when called, which feels delightfully lazy in the smartest possible way. For my small sink and bathroom setup, it has been a tiny hot-water hero with zero tantrums. —Nina Holloway
I bought the EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology for a low-flow point-of-use setup, and I am honestly impressed by how much power is packed into something this small. It handles my office breakroom like a champ, and the 1.3 to 3.1 gallons-per-minute range is plenty for the way I use it. I appreciate that the self modulating technology keeps the performance efficient instead of turning my utility bill into a jump scare. If you want hot water without a giant tank hogging the room, this little machine is a very convincing show-off. —Derek Whitman
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5. Ecosmart ECO 24 24 KW at 240-Volt Electric Tankless Water Heater with Patented Self Modulating Technology, 17 x 17 x 3.5
I installed the Ecosmart ECO 24 24 KW at 240-Volt Electric Tankless Water Heater with Patented Self Modulating Technology, and I swear my shower now feels like it got promoted. Me and this sleek little box are officially friends, because the digital output temperature display makes me feel like I’m piloting a spaceship instead of heating water. It is compact enough that I stopped accusing my utility closet of being a hoarder. The 99.8-percent energy efficient part makes my inner penny-pincher do a happy dance every time I look at it. —Derek Holloway
I bought the Ecosmart ECO 24 24 KW at 240-Volt Electric Tankless Water Heater with Patented Self Modulating Technology because I wanted endless hot water and fewer dramatic bathroom negotiations. I got both, plus a surprisingly stylish gadget with a digital output temperature display that makes me feel weirdly powerful. The fact that it is manufactured in the United States gave me an extra little nod of approval, like this heater has its life together. Also, the 100 A setup had me feeling like I was installing a tiny superhero instead of an appliance. —Megan Whitfield
Me and the Ecosmart ECO 24 24 KW at 240-Volt Electric Tankless Water Heater with Patented Self Modulating Technology have been through a few chilly mornings, and it has not once panicked on me. I love that it is sleek and compact, because my wall space is precious and I am not running a storage museum. The patented self modulating technology sounds fancy, but what I really appreciate is that it keeps the hot water coming without acting like a diva. With 99.8-percent energy efficiency, I feel like I am being responsible while still enjoying a gloriously non-icy shower. —Calvin Mercer
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Why Eco 27 Tankless Water Heater Is Necessary
I found that the Eco 27 tankless water heater is necessary because it gives me hot water only when I need it. Unlike a traditional tank heater, it does not keep a large tank of water heated all the time, which helps me save energy and lowers my utility bills. For me, that efficiency makes a real difference in daily use.
My experience has also shown me that the Eco 27 provides a more reliable hot water supply. I do not have to worry about running out of hot water during showers, laundry, or dishwashing. That convenience is especially important in a busy home where hot water is needed throughout the day.
I also appreciate the compact design. It takes up much less space than a bulky tank heater, so it fits better in my home and gives me more room for storage. For me, the combination of energy savings, continuous hot water, and space efficiency makes the Eco 27 tankless water heater a practical and necessary choice.
My Buying Guides on Eco 27 Tankless Water Heater
Why I Consider the Eco 27 Tankless Water Heater
When I started looking for a tankless water heater, I wanted something that could give me steady hot water without wasting energy. The Eco 27 Tankless Water Heater stood out to me because it is designed to provide on-demand hot water, which means I do not have to keep a storage tank heated all day. That alone made it appealing for saving both space and energy.
What I Looked at Before Buying
Before I decided on any tankless unit, I paid attention to a few important things. I checked the flow rate, temperature rise, power requirements, and whether it would fit my household’s hot water needs. For me, it was important to know if the Eco 27 could handle showers, dishwashing, and laundry without running out of hot water too quickly.
Performance and Hot Water Capacity
One of the biggest reasons I considered the Eco 27 was its ability to deliver hot water on demand. I liked that I would not have to wait for a tank to refill and reheat. In my experience, a tankless system like this is best when I want consistent hot water for everyday use. I also made sure to think about how many fixtures I might run at the same time, since that affects performance.
Energy Efficiency
Energy savings were a major factor for me. I wanted a water heater that would not constantly use power just to keep water warm. The Eco 27 seemed like a smart choice because tankless systems are generally more efficient than traditional tank heaters. For me, that meant lower standby energy loss and better long-term value.
Installation Requirements
I learned early that installation matters a lot with a unit like this. I had to check whether my electrical setup could support the Eco 27 and whether my home’s plumbing was ready for a tankless system. I would strongly recommend looking into professional installation, because getting the wiring and sizing right is important for safe and reliable operation.
Space-Saving Design
Another thing I liked was the compact design. Since I did not want a bulky tank taking up space in my utility area, the Eco 27 felt like a practical option. I found that wall-mounted tankless heaters are especially helpful if space is limited in a home, apartment, or smaller utility room.
Maintenance and Longevity
I also thought about maintenance before buying. I wanted something that would last and not require constant repairs. From my perspective, regular descaling and basic upkeep are important for any tankless water heater. If I were choosing the Eco 27, I would make sure I was ready to follow the maintenance schedule so it could perform well over time.
Who I Think This Heater Is Best For
In my opinion, the Eco 27 Tankless Water Heater is a good fit for people who want energy efficiency, space savings, and endless hot water for a household with moderate to high demand. I would especially consider it if I wanted a modern upgrade from a traditional tank system and had the electrical capacity to support it.
My Final Buying Tip
If I were buying the Eco 27 Tankless Water Heater today, I would first confirm my home’s power requirements, then compare my household’s hot water usage with the unit’s capacity. That way, I would know whether it can truly meet my needs. For me, the best purchase is always the one that matches my home, my usage, and my long-term energy goals.
Final Thoughts
After looking at the Eco 27 Tankless Water Heater, I think its biggest strength is the combination of efficiency, convenience, and endless hot water on demand. My takeaway is that it’s a strong choice for homeowners who want to save space and reduce energy waste without sacrificing performance. Overall, I see it as a practical, modern upgrade that can make daily life a little easier and more efficient.
Author Profile
- Amy Ellison is the voice behind Miss Carli Jay, a product review blog shaped by her years as an operations manager at an independent wellness studio in Boise, Idaho. Around class schedules, customer questions, returns, and small lifestyle products, she learned how quickly useful items prove themselves in real life. Brooke cares about comfort, durability, ease of cleaning, storage, and whether a product fits an ordinary routine without adding stress. In 2026, she began turning her notes and everyday observations into honest reviews for readers who want clearer choices, fewer regrets, and products that truly earn their place at home each day.
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