Model#: ECONECO27

What are the different product conditions?

Brand new items;Full manufacturer warranty available
Manufacturer inspected, repaired and tested items; CPO 120 day money back guarantee
Open Box
New items with possible minor cosmetic damage; CPO 120 day money back guarantee
Returned items inspected, repaired and tested by CPO technicians; CPO 60 day money back guarantee

EcoSmart ECO27 240V 27 kW Electric Tankless Water Heater

Sale Price:
You Save
Free Shipping
(continental U.S.)
In Stock
Ships Monday

Product Overview


With any EcoSmart product, rest assured knowing you are getting a top of the line, eco-friendly water heater that will not only provide continuous convenience, but also help save both money and energy for years to come. With so many advances in heating technology in the recent years, EcoSmart has become the leader in water heating technology.
EcoSmart's ECO 27 Series tankless water heaters are configured for climates where incoming water temperatures can reach as low as 37 degrees. Capable of heating nearly 3 GPM at this temperature, the ECO 27 is the largest electric tankless water heater available with Self Modulating Technology. Suited for colder locations such as the northern U.S. and Canada that require more demanding water usage needs.
  • Save up to 60% on your water heating cost with an EcoSmart electric tankless water heater
  • Provides continuous hot water for ultimate convenience
  • Patented Self Modulating technology and design
  • Designed with standard and reliable easy to service elements and heat exchangers that provide 99.8% energy efficiency
  • Digital temperature control for accurate temperature settings
  • 27 kW 240V Electric Tankless Water Heater - ECO27
  • Owner's Manual
Compliance and Restrictions
warning: --


Length: 17 in.
Width: 17 in.
Height: 3.75 in.
Weight: 11 lbs.
Activation Flow: 0.25 GPM
Amperage: 112.5
Kilowatts: 27
Required Breaker: (3) 40 Amp DP
Thermal Efficiency: 99%
Voltage: 240V
Water Connection: 3/4 in. NPT
Wire Size: 8 Gauge



4.8 / 5.0
5 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Yes, I would recommend this to a friend (5)
Easy To Use (2)
Value (2)
Ergonomic Design (1)
Powerful (1)
Best Uses
Frequent Use (1)
Small Projects (1)
Home Repair (1)
Jobsite (1)
Yes, I would recommend this to a friend
Easy To Use
Best Uses
Small Projects
Home Repair
EZ installation. Performing as advertised.
Was pleasantly surprised with no issues during installation.
Directions EZ to follow. Measured L1-L2 line voltages on power up, and turned on hot water, with temp. set to 100 deg.f Slow to bring water temp up at faucet 50ft from heater on 3/4 in line. Increased temp to 120f and water comes up to temp in a minute or so. Should pay for itself with lower electric bills in a year's time.
April 22, 2017
over 2 years ago
Describe Yourself:
Yes, I would recommend this to a friend
Easy To Use
Ergonomic Design
Best Uses
Frequent Use
Cut power bill almost in half
My house is all electric, so large electric bill is common. I went from an 80 gallon quick recover (5500 volt) hot water tank, to an ECO 27k on demand. I was nervous as to what my bill would be. In Dec 2015 electric bill $462.29. In Dec 2016 used the new ECO 27k all month my bill was 291.01. The months were very similar weather wise. I would recommend this water heater to anyone. I would have purchased an ECO 30k but I only had a 200 AMP service.
December 30, 2016
Describe Yourself:
Avid Do-it-Yourselfer
Yes, I would recommend this to a friend
Grat Value!
I have a great deal of electrical and plumbing knowledge, therefore, it was very easy to install. I think that anyone who can follow instructrions, should be able to do this with relative ease.
May 17, 2016
Yes, I would recommend this to a friend
Don't let the price fool you.
I use this model EcoSmart 27 kW 240V Electric Tankless as a whole house water heater. I live in western Washington, so the temperature here doesn't get much lower than about 25 deg F and input water temp is about 50-55 deg F year round. This unit replaced my bosch AE 125, which was a good unit, that I have had for 8.5 years. It is less expensive than the bosch and seems to work better in several ways, it has a very stable temperature output, 2 showers can be taken at the same time, which together run approximatly 3.5 gpm. temperature adjustment has a digital reading and is accurate at 125 deg F. the hookups were similar to the bosch AE 125, so installation was easy. I have only had this unit for a 3 weeks, but so far excellent. No Cons, I will never go back to a tank type system.
April 22, 2014
Yes, I would recommend this to a friend
Best I have seen
Installed in one day using .5 PEX. Takes 3 40amp breakers with 8ga wire that was real fun to run. But OMG it was worth it. This unit replaced another unit that could not handle winter water temps. Best advice I can give is you pay for what you get. Could have saved $300 by going with this unit first. Oh yeah you will notice lower electric bills if your moving from a tank water heater, like a lot if it a old one.
March 27, 2014

Questions & Answers

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 12 questions Browse 12 questions and 12 answers
Is there a solution to the 'cold water waiting period' between/from unit to faucet....i.e., instant hot water on demand?
A shopper on Dec 5, 2016
My home uses 120V. Can my home support this unit since it says 240V? Thank you!
Greg on Sep 17, 2015
BEST ANSWER: While home outlets are mostly 120 volt, most home's main electrical panel actually have two hot connections, each one being separate 120v circuits from your utility in split phase. When you combine both hot connections in the panel using a double pole breaker and two live wires to the appliance, that is how you achieve 240 Volt connections. Any electrician should be able to look at your service panel and instantly tell you if you can support 240 volt connections.
can I use the same plug in service that my 40 gal water heater uses
Kookie on Aug 13, 2015
BEST ANSWER: No, this model of tankless water heater requires a total of THREE separate 40 amp 240 volt connections. You must install three separate double pole 40 amp circuit breakers and you must install three separate sets of wiring using 8 gauge copper wire. This unit consumes a maximum of 112.5 amps on full power and should only be used on homes that have a service entrance of at least 200 amps.
I have 80 gal water heater now will this electric tankless heater do the same job i never run out of hot water?
Frank K on Jan 23, 2017
BEST ANSWER: This unit is not big enough to replace a 80 gallon unit.
What is the GPM for the EcoSmart27?
None on May 25, 2016
BEST ANSWER: 3 Gallons Per Minuter
I have a 3 bed room house which one of these will be the best one I should get
Don Nino on Feb 15, 2016
BEST ANSWER: Unfortunately, we do not carry a single electric water heater that could accommodate 3 bathrooms.
Waters not getting hot its luke warm then cold and ive tested everything in the troubleshooting guide and that all checks out good its been fine for two years know so what do I check know?
sparky on Feb 5, 2016
BEST ANSWER: For technical support, please contact EcoSmart directly at 877-474-6473
Is this enough for my home with a one and a half bath and kitchen?
Cynthia on Nov 27, 2015
BEST ANSWER: Yes, a 27KW unit should supply a high enough flow rate for the applications you listed
Can I use this tankless for both my in floor radiant heating (50,000 btu requirements) and my shower, sink?
Spalted1126 on Oct 23, 2014
BEST ANSWER: EcoSmart does not spec that unit for use on radiant flooring. Please call EcoSmart directly for technical information for that particular use at 877-474-6473.
What size service is required to operate the eco 27?
A shopper on May 23, 2018