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Model # ECO 27

Internet # 203316218

Store SKU # 1000017272

27 kW Self-Modulating 5.3 GPM Electric Tankless Water Heater

This item has been discontinued.
The Home Depot no longer carries this specific product.

$599.00 /each
  • Can support Whole House Applications
  • Consult electrician. Requires 3 x 40 AMP Double Pole Breakers
  • Heats 3 showers and 1 sink simultaneously in warm climates


Model # ECO 27

Internet # 203316218

Store SKU # 1000017272

Store SO SKU # 1000094390

EcoSmart Electric Tankless Water Heaters, also called Instantaneous On Demand Water Heaters, provide endless hot water on demand and only as needed. Self-modulating flow sensor technology regulates the amount of energy required to heat the water needed. This Smart Technology electric tankless water heater is configured for climates where incoming water temperature can reach as low as 37°F. The ECO 27 is capable of heating nearly 3 GPM at this temperature. The ECO 27 is the largest electric tankless water heater available with Self-Modulating Technology. These models are well suited for homes in the Northern U.S. and Canada and in the southern U.S. that have large Roman-style or Jacuzzi tubs and that have generally more demanding water usage needs.

  • Lifetime warranty
  • Patented self-modulating technology and design
  • Never run out of hot water with an EcoSmart tankless water heater
  • Digital temperature control allows you to set your temperature in increments of 1°
  • All EcoSmart electric tankless water heaters come with an automatically resettable thermostat as opposed to a manually resettable thermostat; the integration of all components and quick connections are designed to promote simplicity for the installer and the user
  • Prior to purchase and installation please verify this model is the right size for your hot water needs
  • Please consult an electrician to ensure your home meets the electrical requirements

    EcoSmart Tankless Water Heater

  • Tankless Electric Buying Guide

    Ecosmart Tankless Water Heater

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Water Connection Size (in.) 
3/4 In. NPT 
Amperage (amps) 
Electric Product Type 
Commercial & Residential 
Finish Family 
Flow Rate @ 35 F Rise (gallons/min) 
5.25 gal (US)/min 
Flow Rate @ 45 F Rise (gallons/min) 
4.08 gal (US)/min 
Fuel Type 
Maximum Temperature (F) 
Minimum Activation Rate (gpm) 
Minimum Temperature (F) 
Product Weight (lb.) 
14 lb 
Residential/Commercial/industrial Use 
Residential, commercial or industrial 
Water Connection Location 
Water Heater Features 
Wall Mountable 
Wattage (watts) 
Warranty / Certifications
Certifications and Listings 
1-UL Listed,CSA Listed,ETL Listed 
ENERGY STAR Certified 
Labor Warranty 
No Warranty 
Part Warranty 


Rated 4.1 out of 5 by 99 reviewers.
Rated 4.0 out of 5.0 by ECO-27 So far so good! the installation is simple for anyone that's handy, event the electrical hookup is straight forward. I have this unit connected after my Geothermal Heat pumps pre heating tank and so far the unit is not running a whole lot. I can see in my electric usage charts it is definitely down since the install. Time will tell as to the reliability and cost saving. my total install cost including electric was around $750. February 4, 2015
Rated 5.0 out of 5.0 by Glad I chose it, even if more changes Tried to fix existing self-cleaning water heater, but new heating coils did not cut it. So, made the decision for an On Demand and chose this one. Required rewiring as more Amps were needed. Then, found out Fuse Box was only 100 Amp, not 200 Amp which was needed, so had to replace that. Also needed to cut tree limbs for higher placed electric wire (thank you electric co-op). Had to put in new elbows and flexible connectors to the On Demand as it had a different placement than 55 gallon water heater. So, after about 5 months of multiple people working on this to get things out, then in, then fitted to, the On Demand is doing great. The 110 degree setting seems too hot for me in summer heat, so I'll lower it iand maybe go back to up in winter. Without the rework time and costs, it would have been the same price as replacing my existing water heater. But, since I am not heating water to keep it at temperature 24/7, but only when I need it for dishes and showers, I'm sure there will be a lower electrical cost effect. Too soon to know what it is. Would recommend to anyone who is capable of thinking outside the box (or tank)! Saves space and I can store more in that room too! July 25, 2014
Rated 5.0 out of 5.0 by From Phoenix, This water heater works excellent, I can run two showers and a sink at the same time with no problems, hot water is fast to get to the back bathroom, most of the installation was very easy, the one thing I could not do was the electrical it required 3 new 40 amp breakers and a fair amount of 8 gauge wire (3 of them) all with a positive, neutral, and a ground wire, which then required all to be placed into a 1" piece of conduit, but all in all it only took 2 hours to do the electrical and 20 mins to mount and connect the plumbing, looks great works perfect and I have had no issues. This replaces a 80 gal old school water heater, frees up a lot of garage space and is saving me $$ on my electric bill. I checked out how easy it would be to change out heating elements and looks like it would be simple, (if necessary) (all parts are guarantied for life) Now I have endless hot water and I would highly recommend it to all. I called in because I wanted my 10% retired military discount, they were great to work with. Ltc. Will C. (USA) Phoenix, AZ January 4, 2014
Rated 4.0 out of 5.0 by Very Pleased This heater is a direct replacement for a previous demand heater. The difference in performance is unreal. I had to constantly fiddle with my old one to the the water temp to remain constant, this unit has solved that problem. I have it set at 115 deg and it's plenty for simultaneous shower and kitchen use. Installation is straight forward provided you have a large enough electric panel to accommodate three 30amp double pole breakers. The plumbing is easy enough for anyone who has some skill at pipe work. If your thinking about a tankless heater, I'd consider this one. Been in use for about a month so durability is still uncertain. April 2, 2013
Rated 4.0 out of 5.0 by Finally! Unlimited hot water! We ordered this tankless hot water heater when our old water heater had to be replaced. The size of it is very small and compact. We have the entire closet free now. My husband was able to install it with some help. The only issue we encountered at first was that the hot water was not very hot but just regulating the flow through the hot water heater rectified that issue. It does decrease the amount of water coming out to fill up the bathtub but that was the only issue we noticed. February 11, 2014
Rated 5.0 out of 5.0 by The system was great for our home. We get heated water throughout our house lightning fast! We are loving it! The product is easy to install and under two hours! March 4, 2014
Rated 4.0 out of 5.0 by Nice, but couild be improved Pros: Easy to install, works as designed Cons: Reduced water flow (slightly, but noticeable in my case), some small fixtures will not flow enough water to make the unit work. In my case, I have a water dispenser at my bar and the flow is about a 1/4 gallon per minute and it does not activate the unit. The installation was a snap. As you can see from the pictures, I used Shark Bite fittings and will from here on out. The little bit of CPVC glue fittings I installed were more work than they were worth, and installing the Shark Bite would have cut the install time in half since the glue took 2 hours to cure. I wish the unit didn't require screws to be installed at the top of the cover. As you can see from my picture, I installed this at the top of the wall by the ceiling, so I was not able to install the top 2 screws, but rigged it to where the cover is firmly in place. The instructions also recommend a temperature of 110 degrees. In my case, the incoming water temperature was around 80 degrees, but still needed to increase the temperature to 120 degrees. I don't know if the instructions take into account pressure balance fittings. July 14, 2015
Rated 5.0 out of 5.0 by Works better than advertised I cannot say enough good things about this heater. The initial set ran about $400. For the additional breakers and wire to be run. Everybody from the plumber and contractor told me to not buy electric , saying that they do not work well, but after installing they were amazed how well it did just that. My savings with the electric bill has not been totaled as of yet, so I will only say that with the tank no being heated all the time I'm sure we will do fine there also. This truly is the best investment one can make to save space and money, as well as remove that constant threat of a massive water leak. February 17, 2015
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