Model # ECO 27

Internet #203316218

Store SKU #1000017272

Store SO SKU #1000094390

EcoSmart 27 kW Self-Modulating 5.3 GPM Electric Tankless Water Heater


27 kW Self-Modulating 5.3 GPM Electric Tankless Water Heater

  • Can support Whole House Applications
  • Consult electrician. Requires 3 x 40 AMP Double Pole Breakers
  • Same-day installation in most areas. Call 1-855-400-2552 by noon.
$504.98 /each

Frequently Bought Together

Product Overview

Eco Smart, 3 Smart Steps for Endless Hot Water
Attention Product Requires Professional Installation

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 Degree 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 degree
  • 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
  • Click here to check out our buying guide on water heaters
  • Click here for more information on Electronic Recycling Programs

Info & Guides

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Name 18 kW Self-Modulating 3.5 GPM Electric Tankless Water Heater 27 kW Self-Modulating 5.3 GPM Electric Tankless Water Heater 36 kW 240-Volt Self-Modulating 6 GPM Electric Tankless Water Heater Tempra 24 Plus Advanced Flow Control and Self-Modulating 24 kW 4.68 GPM Electric Tankless Water Heater
Brand EcoSmart EcoSmart EcoSmart Stiebel Eltron
Ratings (128) (160) (13) (48)
Flow Rate @ 45 F Rise (gallons/min) 2.73 4.10 5.46 3.64
Wattage (watts) 18000 27000 36000 24000
Indoor/Outdoor Indoor Indoor Indoor Indoor
Water Heater Features Wall Mountable Wall Mountable Wall Mountable Overheat Protection,Wall Mountable
Certifications and Listings 1-UL Listed,CSA Listed,ETL Listed 1-UL Listed,CSA Listed,ETL Listed 1-UL Listed,CSA Certified,ETL Listed 4-UL Certified,CSA Listed,ETL Listed
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Warranty / Certifications

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Customer Questions & Answers

I have 200 amp service. Is it big enough for the 27 kw

Asked by: Butch
I too have 200 amp home service. When I moved from a traditional tank type to this, I used the existing 40 amp space for my existing water heater and two additonal spots for the other two breakers. I have never had any electrical issues.
Answered by: hotwaterhome
Date published: 2017-03-22

Would this size do 2 showers , washing machine and dishwasher at same time

Asked by: Deborah
What h/w heater would? How long is the shower? Washing machine on cold, warm, hot, small, medium or large load? Too many variables for a logical answer.
Answered by: Rebel57
Date published: 2017-03-22

Can it be configured to show temperature in celsius?

Can it be configured to show temperature in celsius?
Asked by: IMV
Yes push and hold button for 3 secs
Answered by: Brent
Date published: 2017-03-20

Is the box grounded or I will have to install a separate ground wire ?

The city inspector is aking for a "ground" to the main breaker box
Asked by: Facer
Question for Taylor or anyone who can that the ground terminal bar just to the left of the hot terminal bar? (in the picture) Thanks. If so, will the ground terminal take #6 wire?
Answered by: QuickRick
Date published: 2017-03-20
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Customer Reviews

27 kW Self-Modulating 5.3 GPM Electric Tankless Water Heater is rated 4.0 out of 5 by 160.
Rated 5 out of 5 by from Electricity saving is great. I found the tankless hot water heater very simple to install and it has worked very well in providing plenty of hot water. The 3/4 inch water lines seem to be to large for plenty of hot water. I installed a 3/4 inch shut off on the supply line and needed to close it some to slow down the flow and then we received plenty of hot water. The biggest problem was getting a licened person to sign the warranty card after I had done the install. In Conn a home owner is allowed to install anything in his own home, electrical or plumbing legally, of course with a permit. I felt the requirement to have a licensed person sign the warranty card was a surprise as well a an extra burden. The directions were very clear and easy for anyone to follow. Mark from Connecticut
Date published: 2016-09-27
Rated 5 out of 5 by from Love it, love it, love it! I have a Jacuzzi tub that fills faster than 5 GPM (plus 3 showers + a ... Love it, love it, love it! I have a Jacuzzi tub that fills faster than 5 GPM (plus 3 showers + a washing machine + a dish washer, etc.) so I've put two of these units in series (see photo), setting the first to 126 degrees and the second to 124 degrees so that the second is activated only when needed (quite rarely). For the first time since we've lived in our house, our kids and guests can shower or bathe in hot water ever after we've filled our Jacuzzi tub. Fabulous!!! Did I mention that this product has a lifetime warranty and has a super-small footprint. I've been replacing my way-too-big (80 gal), way-too-energy-hungry water heater every 8-12 years like clockwork (rather expensive). Now I think we're set for life!
Date published: 2016-12-27
Rated 1 out of 5 by from So far, I have installed three of these in my home. The first one gave lukewarm water. Evidently ... So far, I have installed three of these in my home. The first one gave lukewarm water. Evidently only one heating element was working. Home Depot replaced it at no charge. The second one did not work at all and in addition it leaked at one of the joint in the heater. Ecosmart replaced the second one, so for a third time we found ourselves installing one of their heaters. This third heater worked well, and we breathed a sigh of relief...for 6 months! It has now quit working. So we are going to eat our loss, and buy a different brand. Three strikes and you are out!
Date published: 2016-11-27
Rated 5 out of 5 by from I like this tankless unit gives endless showers . We have a family of 4 that likes to take long h... I like this tankless unit gives endless showers . We have a family of 4 that likes to take long hot showers. With our old 50gal after the 2nd or third shower water was cold not now. We live in northern Ohio so in the cold months it delvers the hottest showers if no other hot water is run at the same time. And if you run your bath water the slower you run the water the hotter it will be. And we save on our electricity bill as it does not have to keep water heating in the tank when we are not home, I self installed this unit myself using sharkbite connectors off the shelf . Did have to add 3 ( 40amp )breakers to my breaker box. There are good videos on youtube on Installation
Date published: 2017-02-14
Rated 5 out of 5 by from ECO-27 I bought the ECO-27 on line. It had a September 19th arrival date, it arrived on the 17th. Since the unit requires special electrical hookup I had an Professional electrician install the wiring and double pole 40 amp breakers. I also had a plumber hookup the Water inlet and outlets. This is required for the warrantee. While we have been using the unit for a week, It has worked as advertised. It is extremely easy to set the hot water temp. you want. I have set our unit for 120 degrees F. So far we have used the unit with 3 hot water sources going at the same time; Dishwasher, washer, and shower with no loss of hot water. One unexpected thing was that in our master bedroom shower, it was taking up to a minute or longer for us to get hot water. Now it only takes about 30 seconds for hot water to get to the shower. If you are planning to buy this unit, be sure to budget for the electrical hookup and pluming also unless your are more of a handyman than I am.
Date published: 2016-10-04
Rated 1 out of 5 by from Normally I do not provide feedback on products unless it is really bad or excellent. In this inst... Normally I do not provide feedback on products unless it is really bad or excellent. In this instance this product is ABSOLUTELY WORTHLESS. Called and spoke to a couple of different tech support folks at Ecosmart to make sure I was getting the proper size unit and still no good. Not sure how the Ecosmart did their testing to come up with their advertising figures, but in the real world there is NO WAY THIS UNIT CAN HANDLE ANYTHING MORE THAN A SINGLE SHOWER AT BEST IF YOU WANT HOT WATER OVER 105 DEGREES and that is with a flow rate of probably 1 GPM. Their advertising info. is so far from the mark, that it is a flat out lie and false advertising. Bottom line, this is maybe good for a studio apartment with one shower. If you want the full details read below. Total time spent (wasted) installing unit and trouble shooting about 16 hours over 4 days, not including time spent going to HD for parts. The ecosmart 27 model states 5.3 GPM, however, could not even get 2 GPM if you want hot water. The description states "The ECO 27 is one of the most powerful models from our full line of tankless water heaters, with the capacity to handle a large single-family home and is perfect for a large Roman-style and Jacuzzi tub or high demand of hot water between multiple applications, even in colder climates". 1. Location is Northern NJ (a green zone on their sizing map) and according to the map it should handle two showers and sink at the same time with the inlet temp being 52 degrees and an output at 105 degrees based on their website at 2. Home has 4 full baths (one with jacuzzi tub) and a 1/2 bath. Wanted to be able to run two devices at same time at the minimum. (kitchen sink & shower or Laundry and Kitchen sink, or two showers) Wanted to originally get the 36 model, but did not as I would had to upgraded the electrical supply coming into the house to 300amps (cost about $2,000) which I considered seriously but based on conversation with the tech support, went with the 27 as they said it would at the minimum handle two showers at once. Ran the required electric three dbl pole circuits with ground using 8 AWG wire and connected to the unit (spent ~ $600 in materials). Set the temp to 120 degrees and opened the hot water on sink closest to the unit. After waiting about 5 minutes or so water would not get hot, so I raised the temp to max of 140 degrees. Still no hot water (luke warm at best) Called tech support and checked to make sure that the proper AMPS (234 AMPS), heating elements, thermostats, and everything else was in good working condition but no hot water. One of service tech said, that the flow was to much and that I should use a flow reducer and suggested using a ball valve to decrease the flow rate on the outlet port on the unit. Re-plumbed the unit and installed ball valve and slowed the flow (volume of water) the temp did go up, however could only use one sink or shower at a time. When trying to use sink and shower water flow was diminished to a point that it is about 1/4 of the normal flow rate and really not good for showering. According to the map even in the blue zone with an inlet temp of 37 degrees, the unit should be able to run 2 sinks and a shower at 105 degrees with 2,7 GPM. There is no way this is possible, as I had to almost completely shut off the ball valve to get hot water guessing flow was reduced to ~ 1GPM to reach ~105 degrees. The water in the shower basically had no pressure but at least warm / hot. Then my wife tried to take a bath (jacuzzi tub) with nothing else and the water flow was a trickle and could not fill the tub (the water in the tub turned cold even though it was only filled up about a 1/8th of the way) Do not buy this product.... Had it for about two weeks. It does not meet my expectations.
Date published: 2016-12-24
Rated 5 out of 5 by from I'm not new to the TWH world. I've been using one for almost 20 years. However, the brand I had b... I'm not new to the TWH world. I've been using one for almost 20 years. However, the brand I had before was nowhere NEAR as well-made as this. During the 20 years I used that brand, I had to replace it FOUR times due to leaks. And, I had to replace the motherboard twice to to component failure. The Eco27 is simplicity itself. Not convoluted motherboards with a ton of components to burn out. The chambers are COPPER unlike the former brand I had which were plastic or resin. I did a LOT of research before I chose the Eco27. After I installed it (which was a piece of cake following the instructions), I was rather surprised to find how quickly it heated the water. My old unit had four elements and it didn't heat the water as fast as the Eco27 with three. These guys did it RIGHT. Be sure to use their sizing guide to determine which Ecosmart is right for you.
Date published: 2017-02-11
Rated 5 out of 5 by from First off I live in Savannah, GA needless to say my ground water temp is probably mid 60's. At it... First off I live in Savannah, GA needless to say my ground water temp is probably mid 60's. At its coldest. I installed this unit myself in a day to include all Plumbing and electrical work. I did have to run new electrical 3 runs of 8/2 Romex, and 3ea. 40A dbl pole breakers. I'm extremely handy with home renovation work. Plumbing took about 10 minutes total as I located my new Tankless unit on a sub panel close to the old 50gal tank. I also used the SharkBite Tankless water heater installation valve kit to connect my 3/4" PEX water lines. My system has been installed and running flawlessly for about a week. There are 2 adults and 3 teenagers in my home and we haven't had our usual evening hot water issues at all. We do have to slow the flow down when filling our garden tubs but common sense ( and the directions ) tell you the unit cannot keep up running full bore on a 3/4 inch water supply at 55 PSI the water doesn't make contact with the heating elements long enough to properly heat. However, with the faucet 3/4 open the water is exactly at the 125°F that I set the EcoSmart27 to. Showers are awesome endless hot water so far we have ran 2 showers and several sinks at the same time with no noticeable loss of hot water. Yes, all sinks and showers have the factory water saver devices installed. I couldn't be happier with this unit. I have recommended this unit to all of my friends and family. On a side note If I had Natural Gas in my home I would have installed a Gas Tankless unit. The installation would have been a little simpler.
Date published: 2017-01-04
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