EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology,White

(10 customer reviews)

About this item

This fits your .

Make sure this fits
by entering your model number.

P.when(“ReplacementPartsBulletLoader”).execute(function(module){ module.initializeDPX(); })

Savings of up to 50% on water heating costs. Dimensions :17H x 17W x 3.625D inches ;Pipes fittings :3/4 inch NPT

Digital temperature control in 1-degree increments allows control of hot water; Activation Flow: 0.3 GPM

Copper and stainless components designed for efficiency, durability and easy replacement.

Compact size saves valuable storage space, while the stylish and advanced design is pleasing to the eye and Copper and stainless components designed for efficiency, durability and easy replacement.

Prior to purchase & installation, please verify that this model is the right size for your hot water needs and electrical requirements. Electrical requirements: 27 kW, 240 volts, (3) 40 required breakers, 112.5 maximum power (AMP), (3) 8 required wire.Amperage Draw:113 A

Required Breaker Quantity: Three 40 Amp Double Pole

Recommended Electrical Panel: 200 Amps

NEVER run out of hot water with an ECOSMART tankless water heater.

Save up to 12 cubic feet of storage space.

Digital temperature control in 1-degree increments gives users complete control of hot water

Show more

Add to Wishlist
Add to Wishlist

SKU: B002635ODW Category:

From the manufacturer

ecosmart, tankless, hot waterecosmart, tankless, hot water

Every EcoSmart tankless electric water heater delivers endless hot water, while at the same time saving space, time, money, and allowing you to reduce your overall energy and water use. EcoSmart’spatented, self-modulating, tankless water heating technology can be used worldwide in a variety of applications from homes of any size, business environments such as offices or restaurants, or even recreational vehicles. Each tankless electric water heater is easy to install, dependable, and supported by a knowledgeable customer support team.

Endless Hot Water Ecosmart ECO 11Endless Hot Water Ecosmart ECO 11

Save EnergySave Energy

Save TimeSave Time

Save SpaceSave Space

Endless Hot Water

When sized correctly your tankless electric water heater will provide you with endless on-demand hot water. It heats water as it passes thru the unit, instead of storing hot water like a traditional tank water heater that can run out of heated water.

Save Energy

EcoSmart features advanced self-modulating technology, only using the amount of energy needed to heat water when you need it.

Save Time

Point-of-use installation and on-demand heating cuts down on waiting for hot water.

Save Space

Traditional tank heaters take up a lot of space, but EcoSmart’ssleek, wall-mounted design frees up floor space for more storage and is 90% smaller than a tank.

ECO 27, tankless electric water heaterECO 27, tankless electric water heater

ECO 27

EcoSmart ECO 27 is a 27-kilowatt tankless electric water heater ideal for providing hot water for larger homes in warm climates and small whole home applications with colder inlet water temperatures. It can provide between 2.7 and 6.5 gallons-per-minute depending on the inlet water temperature. To select the best solution for your hot water needs, please refer to the sizing guide. With EcoSmart you will be happier knowing the warm water you expect is available endlessly, consistently, and on-demand, allowing you to reduce your water and energy waste. Now that feels warm all over! EcoSmart – Sharing the Warmth.

ETL Listed – Electric Testing Laboratories

Tested and certified by the Water Quality Association NSF/ANSI 372 for lead free compliance

ECO 27 sizing, sizing map tankless electric, find a heaterECO 27 sizing, sizing map tankless electric, find a heater


ECO 11

ECO 18

ECO 24

ECO 27

ECO 36


ECO 11

ECO 18

ECO 24

ECO 27

ECO 36








Voltage 240

Temp. Range 80°F – 140°F

Max Amperage







Required Amperage

1 x 40 AMP DP

1 x 60 AMP DP

2 x 40 AMP DP

3 x 40 AMP DP

3 x 40 AMP DP

4 x 40 AMP DP

Wire Gauge

1 x 8 AWG

1 x 6 AWG

2 x 8 AWG

3 x 8 AWG

3 x 8 AWG

4 x 8 AWG


11.5″ x 8″ x 3.75″

11.5″ x 8″ x 3.75″

17″ x 14″ x 3.75″

17″ x 17″ x 3.75″

17″ x 17″ x 3.75″

17″ x 21″ x 3.75″


4.75 lbs

6.5 lbs

11.25 lbs

13.75 lbs

13.75 lbs

17.4 lbs

Water Connections

1/2″ CF

1/2″ CF

3/4″ NPT

3/4″ NPT

3/4″ NPT

3/4″ NPT

Key Abbreviations

AMP DP – Amperage Double Pole Breaker

AWG – American Wire Gauge

kW – Kilowatts

CF – Compression Fittings

NPT – National Pipe Thread

GPM – Gallons-per-Minute Flow Rate



Part Number


Item Weight

‎10.98 pounds

Product Dimensions

‎3.63 x 17 x 17 inches

Country of Origin


Item model number

‎ECO 27

Is Discontinued By Manufacturer



‎17 x 17 x 3.5




‎ECO 27




‎Water Heater

Power Source



‎240 Volts


‎27000 watts

Item Package Quantity


Included Components

‎Electric tankless water heater

Batteries Included?


Batteries Required?


Warranty Description

‎Lifetime Warranty on electronics, exchanger and element. Warranty only covers cost of heater; does not cover labor or any incidental damages.





Customer Reviews

/** Fix for UDP-1061. Average customer reviews has a small extra line on hover**/.noUnderline a:hover {text-decoration: none;}4.5 out of 5 stars3,789 ratingsP.when('A', 'ready').execute(function(A) {A.declarative('acrLink-click-metrics', 'click', { "allowLinkDefault" : true }, function(event){if(window.ue) {ue.count("acrLinkClickCount", (ue.count("acrLinkClickCount"), 0) + 1);}});});P.when('A', 'cf').execute(function(A) {A.declarative('acrStarsLink-click-metrics', 'click', { "allowLinkDefault" : true }, function(event){if(window.ue) {ue.count("acrStarsLinkWithPopoverClickCount", (ue.count("acrStarsLinkWithPopoverClickCount"), 0) + 1);}});});4.5 out of 5 stars

Best Sellers Rank

#8,291 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement)#6 in Water Heaters

Domestic Shipping

Item can be shipped within U.S.

International Shipping

This item can be shipped to select countries outside of the U.S. Learn More

Date First Available

February 18, 2010

10 reviews for EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology,White

  1. Ira jackson

    I’ve owned this unit for 2 weeks and installed this and upgraded my outdoor panel in one Saturday. I ran 3 runs of 8/2 with bare ground romex on 3 40amp individual breakers . I planned to update to one of these units over a year ago , I work as a lineman and was able to run a 4/0 urd service to my home for a true 200 amp service I also uprgrade my transformer for the “potential demand this unit would require 6months before installation . I also plan to add more electric appliances to rid myself of propane costs in my area . I used pex and shark bite fittings for ease of install and was able to draw up and plan accordingly, I then used amazon to purchase 90% of the material needed . “My” upgrade cost was a little less than a $1000 doing the work myself with the application at hand . I installed sediment filtration and a scale inhibitor before the unit including isolation valves at the unit . The reviews of poor equipment life and bad reviews I chalked up to people not installing filtration or isolation valves to flush unit every six months . The reviews of people complaining of blinking or flickering lights are those people who haven’t upgraded the service feeding the home or they install less than adaquate wiring feeding unit . With a properly fed home/unit this unit will not “pull” the lights down . So my advice to those install this unit or another whether more large or small is to plan accordingly with your electric company . Most companies should understand the draw by doing a simple equation (formula below)and determining if your going to be good. I would also say minimum panel service would be 200 amps , even though your likely to never see that much draw . I’ve included a pic of the old water heating cabinet in the hallway of my home to help you visualize what I’ve explained .This unit27kwSource voltage feeding unit240027x1000= 2700027000 divides by 240= 112.5 amps of draw at full loadVery unlikely you’ll ever see full load due to water pressure restrictions in your area and the modulation of the unit to conserve energyIf any questions arise , feel free to askThanksIra

  2. Kirk M.

    First off I read all the negative reviews and wanted to give my feedback with this unit and customer service.First off no water heater is maintenance free. These units you must maintain the elements for it to operate efficiently.Next, verify your water temperature before selecting a unit and calculate your demand.These units ramps the temperature up, it’s not 100% instant.Know the acid level of your water and make sure it’s treated or any device will be corroded and eaten away.Know your water hardness, and make sure you use an inline descale device to protect the elements..If your water has sediment, make sure you use filters.Somebody else stated there was no way to connect connect conduit…. which is incorrect.All of this is really common sense that anybody on a well or poor public water should be use to. And just because you have public water, don’t take for granted it’s 100% perfect. Poor water will lead to a shortened life of this or any device. The more you treat and filter your water before this unit, the better it will perform and continue to perform.I did have to call the company for support. Other complained about poor customer service, this was not my experience. I had an issue with the unit creating a strobe effect on my LED lights. I verified the unit was installed correctly and there were no loose connections. I verified my voltage levels and made sure both legs were balanced as best as possible with amperage draw. I call my utility company and they verified the voltage on the service side from the pole to the meter base and everything was good inside and outside of the house.I called support and they answer quickly. I told them what I already had checked and they said that I was two steps ahead of them and the last cause was the control board. They sent a new board out that day and I received the following day. There was a small change to the board so I call support again and once again they answered quickly and they answered my simple problem / question.The new board corrected the strobe / flashing LED light issues.If you cannot or not willing to troubleshoot your electric, volt or amperage, do not expect their support to work wonders over the phone. If truly need support I’ve found their support to be great.After I installed the new board, the unit works perfect, I have great hot water temperature and

  3. Jeffrey Evans

    I purchased the ECOsmart ECO 18 tankless water heater in April from Amazon during one of their open box warehouse sales for a very cheap price. The unit arrived as a wreck (as I expected it would). After beating out the smashed in cover (from improper shipping packaging) I inspected the inner workings, and found several parts ajar, and the cold water inlet fitting missing. Amazon offered an additional discount to me, so I took it, and set out to fix the unit, and replace the missing part. The cold inlet fitting has a one of a kind unique fitting threads, and I quickly found out that it’s irreplaceable. A call to Ecosmart tech support was personally and professionally handled. The tech told me that this part is not available. He then went into their spare parts junk drawer, found one used, and sent it to me for next to nothing. I couldn’t be happier with Ecosmarts service! The unit sat for 4 months until I had time to install it myself. I wanted to be sure it worked before gutting out my perfectly good water heater, so this report is what I found by permanently wiring, but temporarily plumbing the unit so as to not disturb the existing water heater. First of all, I live in South Florida (Broward County). Our water is fairly warm as supplied (70 Deg. Inlet temperatures in summer). I can only report how the unit worked with reasonably warm inlet temperatures. I’ve lived in the past in places where the water is 50 Deg. Year round coming out of the tap (NE Ohio), so I know I’m living in ideal conditions for a tankless electric water heater set up. I can report the following: I measured my normal shower water temperature. I like a hot shower. Using a lab quality thermometer, I find a water temperature of 95 to 98 Degrees is pretty darn hot. Maybe not hot enough to thaw out a frozen Ohio Linesmen, or firefighter with ice frozen to your face, but plenty hot for normal humans. I have the ECosmart 18 because electrically, my house only has 150 amp service. Larger Ecosmart units would overload my supply service. As tested, a 5 GPM flow (That’s enough for two old fashioned shower heads AND a sink running hot, the outlet hot water as measured was 115 degrees. This is with the unit set as high as it will go (140 Degrees). The unit will maintain a 45 degree water temp increase over inlet temperature. Testing at a flow rate of 2.5 Gallons per min.(enough for an old fashioned shower head and a sink), the unit maintained 135 deg. With the temp set at 140. My unit had no problem maintaining 115 deg. output if set at 120 deg. With a flow rate of 2.5 gallons a minute. In testing, I found a constant 5 degree error between what the unit says the set temperature is, and actual. Not bad considering it’s not an aerospace product, and some small gauge error is possible. The hot water tank I’m replacing is a 65 gallon unit, and IT DOES flicker the house lights every time a heating element turns on. (Noticeably annoying). I am super happy to report that the Ecosmart 18 unit does not flicker my house lighting. If you look very carefully, a very, very slight, teeny, weeinee load can be seen in the interior lighting of the house when the Ecosmart unit turns on, but it’s MUCH better than my existing standard tank type water heater. The ECO 18 turns on with very little water flow (a sink just turned on enough to wet a tooth brush will trigger it to heat the water) so flow sensing is perfect, and not a factor at all. My overall opinion is that yes, the unit is delicate, and is prone to damage in shipping. Once placed in service, it’s rugged enough to last a long time, and it works better than advertised. If you are in very cold water climate, you will need the biggest unit, and adequate power supply. Ecosmart lists what the unit will actually do modestly. If you read up on the specifications for each of their units, and match your water need and water temperature and follow the installation instructions you will never be disappointed by purchasing an Ecosmart unit. These things are great! Do your homework before you buy, and match it properly, you won’t be disappointed! Removing that old tank water heater and replacing it with the Ecosmart gave me a whole lot more room in my garage, as an added benefit too!

  4. Boy From The Mountain

    Cost a lot more than I anticipated to install. I used sharkbite fittings and valves which worked great. Haven’t had any leaks on those connectors. I got 10 ft of 3/4 inch copper pipe and used 6 ft of it. Expect to use 1 inch diameter electric conduit or flex pipe. I used Webstone EXP E2 service valves for flushing the Water heater. I could have done it without the pressure relief valve. I have it set to 122°F and its plenty hot. Takes a minute or two to get hot water. A little longer than when we had the tank. Some rooms get it faster. I used 3 sharkbite valves for changing the filter. Definitely worth the extra cost and labor. We have hard water on a well, so I installed a Pentek 3G Whole House Water Filtration Housing and Aqua-Pure AP420 Hot Water Protector and Scale Inhibitor filter. I used a 3/4 in to 1/2 tee to hook up our ice maker and fridge. Used a 1/2 to 1/4 sharkbite valve for that. Worked out very good.Service valves: Webstone 44443WPR 3/4-Inch IPS Isolator EXP E2 Tankless Water Heater Service Valve Kit with Clean Brass Construction filter housing: Pentek 3G-STANDARD-CLEAR-34-PR10 Whole House Water Filtration System Housing Aqua-Pure AP420 Compatible Filter, KleenWater KW420 Hot Water Protector and Scale Inhibitor, Prevents Scale Build-Up On Water Heaters Standard and Tankless, Set of 3 Pentek 150578 MC-1A Bracket for 3/4″ 3G Filter Housings Pentek 151120 Buna-N O-ring for Standard & 3G Standard Housings water pressure and water texture is improved! We have 2 showers and the can both run at the same time as long as we want. We now have space in the closet to keep the vacuum, broom and more. It took me one day to do the electrical, including a 2 hour round trip to hardware store. And another day to install everything else. Could have been done in a single day if you have all that you need and no distractions. I had a lot of distractions. I haven’t seen the electric bill yet.1/12/2019We’ve had a small reduction in energy use. But we’re always home during the day and a large family. I changed out the AP420 filter twice since the install.

  5. Robert Von Sarbacher

    Trying to get rid of gas heated anything in the house to protect the family – I bought this – problem with it is only one thing….. for a LARGE 3 full bathroom house if you used the furthest away bathtub from the unit (downstairs garage) you could not put it on highest setting to get water out of the bathtub – you had to put it on like medium flow of water coming out to get it to super scalding hot – it could not keep up – that being said – showers were no problem – scalding hot – also cut down on my bills – no more gas bill at all plus increase in the electric bill b/c of this unit was about 1/2 of what gas was b/c only ever turns on when water flows period… it was fine to use in multiple bathrooms and kitchen at same time also FYI…. so these were all my worries thinking I was totally screwing up buying one of these devices – but it works!!! one last note::: it cost me $800 to have an electrician put in 4 of the 40AMP connectors necessary to run this device which cost in the end more than double the cost of this device – it will NOTTTT work without a 40AMP and it’s very unlikely you have 4 extra 40 AMP connectors on your electric grid in house and if you do they are used by something else guaranteed ! this is something they did not mention!! even though it’s on the box it’s umm wow… ugly cost – also the cost to BUY the 40 AMPs switches were ummm $60ish or where they $100 ish I forget … so over $1000 total cost on electrician plus switches! sheesh… but I’m saving about $50 per month by switching to this so in 2 yrs it’s paid for anyway but still – sheesh -I will give also another word of advice – I looked thru 100 of these devices – OMG so much work – let me tell you that had I spent that amount of time searching instead of a person who installed 100s of these before (a full plumber/electrician company) I would have probably saved crazy money b/c I don’t thing I would have been spending that $1000 to $1200 for an install – I think they would have handled the whole thing for like $700 ish (install for plumbing for this device PLUS upgrade of electrical PLUS 4 switches cost etc) … OOPS… I did not find this out until RIGHT AFTER the electrician was done – my friend had called me the day of or day after I had it all electrically upgraded to tell me they had found about 3 others that do this all the time in addition to working all sorts of other construction jobs – they did say however these devices are all quite GOOD if you do not go cheap like $187 one – notice I got the 2nd to most powerful one in existence the 27 version with 4 of the 40amp connectors and so on… they said they just dont have trouble with these devices but they do require maintenance like de-scalling the calcium scales off every few yrs – I never need that though b/c I have a water enhancement unit that forbids scaling for life – hehe….

  6. iScott

    The GoodAs for the item itself I would only suggest that the purchaser make sure they have sized the unit correctly for their needs and have taken their area’s ground water temp into account. The unit has a sublimely simple design and its shell is both space efficient and cosmetically pleasing. Unlimited hot water is a decadent luxury and Ecosmart makes it affordable to all. My lady is finally able to take her time wash and shave without ever running out of hot water (yikes for my water consumption). Regarding water consumption I’v found that this unit works amazingly well with the “Spa Fire-Hydrant” shower head, Economy and Performance.The BadThis pertains to the install process and NOT the unit. — The plumbing is very straight forward and should be doable by a moderately experienced DIY’er with basic plumbing tools and a little soldering know-how. The Electrical is also not very difficult BUT requires two Double Pole 40-Amp Breakers and sufficient sized service to handle the unit (which is actually comparatively large). But if you’ve got the space or are willing to upgrade your electric service this item is a must-have.Final WarningThe large cost for this unit will come from the install by licensed professionals without which you cannot quality for the lifetime Warranty, My advice (if you are not planning to install yourself) would be to get quotes for the install (both plumbing and electrical) and compare those numbers to the cost of the unit if you end up paying more for the install than the unit is worth you might be better off forgoing the warranty because if you do have a problem it would still be cheaper to by a replacement unit.***One year UpdateI’ve had this unit for a year now and recently blew a heating element, (an issue caused by a plumbing change and NOT the unit itself). I only bring it up because its a bit of a pain to have to order a replacement from Eco-Smart since no other place I found (Even Amazon!) carries this odd element size (9kW 240v Screw-In). So I would suggest having a spare on hand to avoid the shipping time wait if it becomes necessary. Also having seen first-hand what kind of scale and build up can occur at tragic speeds on the heating elements, do yourself a favor and drop the extra $65 on the recommend ‘Aqua-pure’ scale inhibitor. Most users can only tell you that it seems to work having nothing to compare it against. I have seen both sides and it makes a world of difference! Aside from that, I am Extremely happy with this purchase, there is no going back in my household, Even with my girlfriend’s new 45 minute long shower ritual (compared to the 25ish she use to get), I have seen a consistent 20-30% electric consumption drop when compared to the two years proceeding it. So my unit will have paid for itself after another year of usage. If your experience is anything like mine you will NOT be disappointed with this unit, so I’d say buy with confidence***5-year UpdateAt the 5 year mark, I have been through 2 heating elements (since installed) and always keep 2 on hand to be prepared. I am positive that the unit has paid for itself at least twice and is still working strong. There is absolutely no going back to a standard tanked unit. Until a recent trip out of town in a hotel shower, I’d completely forgot about running out of hot water. The moment this unit breaks I’m replacing it with an identical unit. (A decision made over 2 years ago) every home owner should have one of these units. Save space, save money, and enjoy your unlimited hot water as a bonus for your wonderful investment!

  7. Amazon Customer

    After hours and hours and weeks and weeks of researching and reading reviews I chose the Eco 18. It was torture.. but I’m VERY happy with the Eco 18. I’ve had it for about a month and no complaints. But do your research.. You have to consider the inlet water temperature, your electrical box capabilites, the size of your home or potential for multiple appliances or faucets running at once as well as your faucet GPM (gallons per minute).I have a 2br/1ba home in South Western NC.I was concerned if I got the ECO 11 it would struggle in the winter or if there was more than 1 faucet or appliance running. However, the ECO 11 has the least amount of electrical requirements.. It just needs 1 breaker which is what I thought I only had room for 1 breaker.I was originally going to get the ECO 24 but I didn’t have enough room in my breaker box for THREE breakers and it was probably overkill for my home but really didn’t want any issues with not enough hot water.I didnt realize it but my existing water heater already took up 2 double spots in the breaker box so the ECO 18 was perfect.You also need to be aware of your faucet GPM or Gallon Per Minute. I read somewhere that if your GPM is too high it will not heat consistently or maybe not at all so I changed my shower head to a 2GPM shower head as well.. that also might be overkill.After all the research and debating the ECO 18 is perfect and fits perfectly on the wall in my small laundry room. I highly recommend!

  8. Walleyeman

    I had a hard time finding a plumber or electrician to install a 27 model in central Montana. They are all stuck in past technology. Most of them swore this unit would not work. They insisted that my intake water temp was too cold, without ever testing it. I am 75 years old, and although I retired from the aircraft maintenance field I wanted a licensed professional to do the work in order to get the warranty, just in case. My water comes into my house at 55 – 57° winter and summer. My water comes from a deep community well with over 100 homes, so the water is constantly moving. It has been 2 years since my unit was installed and I haven’t had the first problem. Its more than adequate for my two story home about 2000sf, two full baths, 2 showers can easily run at the same time. I frequently use an induction cooktop, microwave, airfryer and dishwasher, I have had no problems on a 200 amp system. I do make sure the induction cooktop and the microwave are never on at the same time. While I do notice the lights dim slightly when hot water is running in several places, I have never popped a circuit breaker. I strongly advise professional installation and the proper size unit for your climate. You must realize that this is a volume demand system and even tho the model 27 has three elements, seldom is more than one running at any given time. I would never own a home without a tankless water heater installed.Update, 3 years now, and not a hiccup! My plumber just finished flushing the unit. Very small amount of black sediment, and a tiny bit of calcium like scaling. He still recommends annual cleaning. Small price for added assurance.

  9. Dave

    Some information about this unit (and the entire product line) is sparse, and numerous people have posted inaccurate information as well. First, RTFM. EcoSmart provides a wealth of information online, and all of us would do well to check their site before posting bad information.I have two of these units, one for DHW (Domestic Hot Water) and the other to operate our whole house hot water baseboard system. Some information is hard to find, and other information is a closely guarded secret and cannot be obtained anywhere online. I’ll focus on these areas.The unit is rated at 27KW at 240 volts. Internally, it is three separate 9KW heaters, operating in series and in sequence based on demand. The unit is truly self-modulating and will not provide more heat than the load requires.Each individual heater requires a dedicated 240 circuit, rated at 40 amps, and provided via #8 wire. For the Ohm’s law fanatics, each unit draws 37.5 amps under full load, for a total system load of 112.5 amps. Anybody that tries to operate this unit off of a 100 amp main breaker deserves what he gets. We have ours connected to our main 150 service, and can get away with it because everything else in the house is “green” and we can operate everything else with the 37.5 amps available if the heater is running under full load.I’ll say this again: Each internal unit requires a separate, dedicated 240 volt 40 amp circuit, equalling a total of three separate #8 wire 240 volt circuits. I hope I made that plain enough.The heat exchangers inside the heater are 3 copper pipes, cross connected in series with about 1/2″ dia. copper sections. So there is a flow restriction, but nothing as radical as some of the reviews would have us believe. Some reviewers have posted that their hot water is down to a trickle. I’ve been inside this unit from top to bottom. If your hot water only dribbles, it is time to clean your pipes or replace your valves. We have not been able to observe a loss of flow anywhere in our house, enough said about that.The upper temperature limit is 140 degrees F. That is a difficult number to discover, but it is out there if you do your homework. Regardless, 140 is the hard upper limit in DHW mode. This is not a limitation of the unit, it is a safety limitation to minimize the chance of someone scalding themselves, and EcoSmart states this all across their web pages.Here’s the undocumented stuff:EcoSmart supports hot water heating, and even provides plumbing diagrams. However, they will not tell you how to get 160 or 180 degree water. There are internal jumpers in the heater that allow you to limit the maximum output temperature to 105 degrees (handy for the elderly or where there are small children playing with the knob), and it is also possible to set a wattage limit across the 3 heating elements. The factory setting is 9KW per element, and 140 degrees max. output. At the very top of the jumper strip is one marked “180”. With power removed, place a jumper on these two pins and the unit will allow a setpoint of up to 180 degrees when power is restored.Most hot water heating systems operate best in the 160 degree area, and the older oil fired boilers actually used a setpoint of 200 degrees. Clearly, a heater with an upper limit of 140 degrees could cause poor performance of most baseboard hot water systems, and many of the newer hydronic systems. We replaced an antique oil fired boiler with the ECO27, and placed the setpoint at 160 to get started. The performance is nothing short of amazing, and I’ve actually dropped the setpoint to 150 until we get into the dead of winter. It is very nice to know that we have a reserve available.EcoSmart provides a wealth of information about the capability of this unit. I see over and over again that people can’t (or won’t) get their heads around a lot of what’s commonly available. Simply, if you need 4 GPM, the best this unit can do is heat the water by 46 degrees. In other words, if you want a 110 degree shower (at a ridiculous 4 GPM), you must have incoming water of at least 64 degrees. If you live in an area where your water source is about 50 degrees, you will get 96 degree showers at 4 GPM. The obvious solution is to spend $20 and get a low-flow shower head. At 3 GPM this unit can give you a 110 degree shower with incoming water of only 49 degrees. At 2 GPM this unit will provide the full 140 degree setpoint with 50 degree incoming water.In boiler service, obtaining 160 degree water will require incoming water of at least 114 degrees. Most hot water heating systems operate with a differential of less than 20 degrees, so this unit is just loafing along while providing 160 degree water to your baseboard units. Also, most standard hot water heating systems have a design of either 1 GPM or 4 GPM. The temperature rise chart from EcoSmart demonstrates that a temperature rise of 184 degrees is possible at 1 GPM. Again, most hot water systems operate with a differential (or “Delta-T”) of around 17 degrees, often less. The actual temperature setpoint isn’t the focus as much as being able to maintain the differential is. So for a 180 degree output, we need to feed the heater with 163 degree water. At a mere 17 degree rise, this heater can easily flow well beyond 6 GPM, probably closer to 10 GPM, but we only need a max. of 4 GPM. So for boiler service, it is a perfect solution. It is small, silent and smart.If you’re considering this unit for hot water baseboard or hydronic service, it is capable of 92,000 BTU/hr.It has been incorrectly represented that this is the largest electric tankless available. The largest commonly available electric tankless is 36KW. Just to set the record straight.Overall, I give this unit 5 stars. Price, reliability and technical support are right up there. The unit comes with a lifetime warranty when professionally installed. Cleaning and maintenance is accomplished with a Phillips screwdriver, no more pipe wrenches and fiberglass insulation to contend with. The unit is so small and lightweight that I actually carried it into the house under one arm, installed it and said nothing. Nobody knew that I’d done this until days later!The unit supports a remote thermostat which is very inexpensive and is waterproof. The little remote connects with telephone wire and is perfect for a location next to your sink or shower.We are a 3 adult household, using all of the “normal” things, doing laundry, taking showers, washing dishes, etc. I have been able to purposely cause the heater to fail to keep up, and that was by running the tub wide open. In any other situation, two showers at once, someone in the shower, someone else doing laundry, etc., I have yet to hear a single complaint. All I ever hear is how wonderful it is to have a long shower, or not have to wait 1/2 hour, etc. The days of my wife complaining about no hot water for the dishes because I took a long shower have ended!This is a true, self-modulating unit. People that have reported lights flickering and their TV having problems need to look at their house wiring. The unit starts softly, just like turning up a light dimmer. There are no flashing lights in this household. The only way I’ve ever been able to tell if the unit is running is to actually look at it – The display is only lighted when the unit is operating.Not to be overlooked is the energy savings. A tank heater will cycle 24/7, to maintain a tank full of hot water, even if you’re on vacation. The tankless does absolutely nothing unless it detects water flow. Through an intelligent design EcoSmart units ignore faucet drips and won’t send hot water to drippy faucets. The minimum flow to start the unit is 1/4 GPM.Hope this helps to quash some bad information and get accurate information posted.Dave.

  10. John Edward

    Bought the ECO 27. I am in a warm climate, 75-78 degree water inlet. I have the output set at 125 degrees. I have also removed all the water conserving devices in my showers. I live in a fresh water swamp, over an aquifer, so I don’t care about saving fresh water, we have plenty of it. So I was worried about going tankless, because I have three showers, and all three push out over 4 gallons per minute. Since tankless are rated on a 1.5 gallon per minute shower, I was worried because one of my showers pumps out almost as much as three 1.5 water saving showers. I have had this a week, and have run 2 showers with it simultaneously (haven’t tried all three yet). Hot steamy showers for both. I have a 200 amp service. I was worried because I have two central air conditioners, a pool pump, a spa pump, and lots of other demand. I was worried about tripping the 200 amp main. But I can ramp this unit up to full power, all three burners, with no problems. Also, no lights flickering or anything like that. I have a 60 foot run from my panel to this unit. So instead of going with 8-2 wire, I stepped up to 6-2 wire. Costs more, but I didn’t want to have any problems with 8-2 wire over a long run. If you have a run of over 50 feet, I would recommend using the 6-2 wire. Using 3 double pole 40 amp breakers. The 6 gauge wire fits no problem into the connection points inside the unit, the only thing hard is getting 3 runs of that wire through the small 1 inch knockout. You have to strip back the Romex cover and just run the individual wires. I also used a conduit instead of the included clamp down, because I wanted the wires completely enclosed. On the panel side, I ran each run in separate 3/4 inch flex conduit, and inserted using 1/2 inch kockouts. The only complaint is that when this thing runs full out with all 3 burners cranking, it sounds like a 747 jet engine taking off. But not a problem for me due to the mounting location under a staircase, but would hate this thing to be installed in a bedroom or something. I like the fact that this unit uses standard 3/4 inch water heater connectors, and you don’t need to use adapters and such like other models. Just standard 3/4 inch plumping available anywhere locally. One thing I noticed is that you really have to tighten the connections, or they leak. I first wrapped with teflon tape, and tightened how you normally would tighten 3/4 pipe thread, but the connections leaked. So I then used Reactorseal teflon paste, along with a couple wraps of teflon tape, and really tightened them hard (especially the hot output). I tightened so hard I was worried about stripping it. No leaks, but took lots of Reactorseal, teflon tape, and very tight. Doesn’t seem right, but no leaking now.

Add a review

Your email address will not be published.