From the manufacturer

At EcoSmart, we develop innovative, life-enhancing tankless electric water heaters for homes and businesses, enabling them to enjoy everyday living: sharing the warmth of endless hot water. Additionally, EcoSmart is part of the Rheem family of brands.

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. This mark serves as proof of product compliance to North American safety standards and guarantees a safe and reliable water-heating solution.

EcoSmart products are technologically advanced and can be used worldwide in a variety of applications from homes of any size to business environments such as offices or restaurants, or even recreational vehicles. Each tankless electric water heater is easy to install and dependable.

Finally, as part of our commitment to give back to our communities, EcoSmart actively participates in the Rheem Heart of Comfort program with donations to Habitat for Humanity initiatives.

Go Tankless

Product Features

Endless hot water
Save up to 50% on your water heating costs according to the Department of Energy
Compact design, more storage space
Digital temperature control 80 - 140° F
Field replaceable elements
Advanced self-modulating technology

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.

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

Save Energy - EcoSmart features the most 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 Money - EcoSmart tankless heaters only turn on when you need hot water - plus they cut down on heat loss, saving you up to 50% in water heating costs according to the DOE.

ECO 36

EcoSmart ECO 36 is a 36-kilowatt tankless electric water heater ideal for providing hot water for apartments, condominiums, townhomes and other whole home applications. It can provide between 3.6 and 8.7 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.

3 Smart Steps for Endless Hot Water

Step 1: Determining your average inlet water temperature is important, this allows you to determine how well your unit will perform in your desired location. A lower inlet water temperature will require a higher kilowatt product.

Step 2: Next you will determine how many applications your unit can run simultaneously at your chosen location inlet water temperature. Tankless electric water heaters are sized for maximum simultaneous use, not maximum fixtures in your home.

Step 3: Determining specifications and electrical infrastructure is important because without the correct infrastructure your unit may not fit into your breaker panel.


	ECO 8	ECO 11	ECO 18	ECO 24	ECO 27	ECO 36
	See Details	See Details	See Details	See Details	See Details	See Details
Customer Reviews	—	—	—	—	—	—
Price	—	—	—	—	—	—
kW	8	13	18	24	27	36
Voltage: 240	✓	✓	✓	✓	✓	✓
Temp. Range 80°F - 140°F	✓	✓	✓	✓	✓	✓
Max Amperage	33	57	75	100	112.5	150
Required Breaker	1 x 40 AMP	1 x 60 AMP	2 x 40 AMP	3 x 40 AMP	3 x 40 AMP	4 x 40 AMP
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
Size	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"
Weight	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

Product information

Technical Details

Brand

‎EcoSmart

Product Dimensions

‎21"W x 17"H

Color

‎White

Wattage

‎36000 watts

Voltage

‎240 Volts

Maximum Flow Rate

‎6 Gallons Per Minute

Heat Output

‎36 Kilowatts

Style

‎ECO 36

Manufacturer

‎Ecosmart

UPC

‎785577595127 854920002350

Global Trade Identification Number

‎00854920002350

Part Number

‎ECO 36

Item Weight

‎18.35 pounds

Item model number

‎ECO 36

Is Discontinued By Manufacturer

‎No

Pattern

‎Heater

Amperage Capacity

‎150 Amps

Item Package Quantity

‎1

Usage

‎Residential

Included Components

‎Rough Plumbing, Water Heaters, water-heaters

Batteries Included?

‎No

Batteries Required?

‎No

Warranty Description

‎Limited Lifetime Warranty

Additional Information

ASIN

B00M05IUE6

Customer Reviews

4.0 678 ratings

4.0 out of 5 stars

Best Sellers Rank

#153,335 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement)
#192 in Water Heaters

Date First Available

July 21, 2014

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.

Product Warranty: For warranty information about this product, please click here. [PDF ]

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Product guides and documents

User Guide (PDF)

User Manual (PDF)

Product Description

Eco Smart ECO 36 Electric Tankless Water Heater, 36 KW at 240 Volts with Patented Self Modulating Technology Why Eco Smart? If you have a need for a high amount of hot water then the ECO 36 is the right choice. The ECO 36 is the largest electric tankless water heater available with our patented self-modulating technology. This smart technology tankless water heater is ideal for the northern United States, where incoming water temperatures can reach as low as 37 degrees F. The ECO 36 is capable of heating nearly 3.5 gallons per minute at this low temperature. To put that into perspective, it can handle up to two showers running at the same time and never run out of hot water. For homes in the southern United States, the ECO 36 is perfect for large Roman-style and Jacuzzi tubs or high demand of hot water between multiple applications. It can handle up to 6 gallons per minute, which means you can run four showers and a sink simultaneously and never run out of hot water. A digital temperature control allows you to set your temperature in increments of 1 degree, so you can set the temperature to how you like it. The ECO 36 is the most powerful model from our full line of tankless water heaters, with the capacity to handle a large single-family home.Take a look at our full line of tankless water heaters below to see what's perfect for you. THIS MODEL REQUIRES 150 AMPS DEDICATED!. Required Wire: 4 x 8 AWG

From the Manufacturer

Ecosmart ECO 36 Electric Tankless Water Heater, 36 KW at 240 Volts with Patented Self Modulating Technology Why EcoSmart? If you have a need for a high amount of hot water then the ECO 36 is the right choice. The ECO 36 is the largest electric tankless water heater available with our patented self modulating technology. This smart technology tankless water heater is ideal for the northern United States, where incoming water temperatures can reach as low as 37 degrees F. The ECO 36 is capable of heating nearly 3.5 gallons per minute at this low temperature. To put that into perspective, it can handle up to two showers running at the same time and never run out of hot water. For homes in the southern United States, the ECO 36 is perfect for large Roman-style and Jacuzzi tubs or high demand of hot water between multiple applications. It can handle up to 6 gallons per minute, which means you can run four showers and a sink simultaneously and never run out of hot water. A digital temperature control allows you to set your temperature in increments of 1 degree, so you can set the temperature to how you like it. The ECO 36 is the most powerful model from our full line of tankless water heaters, with the capacity to handle a large single-family home. Take a look at our full line of tankless water heaters below to see whats perfect for you. THIS MODEL REQUIRES 150 AMPS DEDICATED!

WARNING:

CHOKING HAZARD -- Small parts. Not for children under 3 yrs.

WARNING: California’s Proposition 65

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	Try again! Details Added to Cart spCSRF_Control	Try again! Details Added to Cart spCSRF_Control	Try again! Details Added to Cart spCSRF_Control	Try again! Details Added to Cart spCSRF_Control	Try again! Details Added to Cart spCSRF_Control
Price	$410.18	$179.00	$294.49	$908.34	$749.00
Delivery	Get it as soon as Thursday, Jul 25	Get it as soon as Tuesday, Jul 23	Get it as soon as Thursday, Jul 25	Get it as soon as Friday, Jul 26	Get it as soon as Tuesday, Jul 23
Customer Ratings	4.0678	3.88	4.56	5.04	4.442
Sold By	Amazon Resale	Amazon.com	ECOTOUCH Appliances	Direct Supply Store	Amazon.com
capacity	6 gallons	1.5 gallons	—	6 gallons	—
power source	ac dc	ac dc	Corded Electric	Corded Electric	AC
mounting type	—	Wall	Wall	—	Wall
heat output	36 kilowatts	140 degrees fahrenheit	—	—	36 kilowatts
material	Copper, Stainless Steel	—	Metal	—	Stainless Steel
style	ECO 36	Indoor Installation	Indoor Installation	Indoor Installation	Indoor Installation
weight	18.35 pounds	4 pounds	19.18 pounds	—	—

Important information

Wattage

36000 watts

Bulb Voltage

240 volts

Customer reviews

4 out of 5

678 global ratings

How customer reviews and ratings work

Customers say

Customers like the value, ease of installation, and size of the water heater. For example, they mention it's well worth the cost, easy to mount, and saves space. That said, some complain about the warranty and power requirement. Opinions are mixed on the heat.

AI-generated from the text of customer reviews

Select to learn more

Quality Value Ease of installation Size Heat Power requirement Warranty Control board

78 customers mention "Quality"56 positive22 negative

Customers like the quality of the water heater. They say it works excellent, performs flawlessly, and is a great space saver. Some customers mention that the unit works great with a slight increase in electric bill. Overall, customers say it's a well-made and steady unit that works well for multiple showers.

"...recommend any EcoSmart product because of the customer service, the quality, ease of installation, and the lifetime warranty." Read more

"...only runs while you are actively running hot water, it saves money on electricity overall, and gave us a full closet back in storage space...." Read more

"Awesome product and quality. I did alot of research and ended up buying this and it is great...." Read more

"...It would not turn on when the water started flowing...." Read more

31 customers mention "Value"22 positive9 negative

Customers like the value of the water heater. They say it's well worth the cost, saves money on utility bill, and is a great buy. Some customers also mention that they saw a significant drop in their electric bill after installing it.

"...The install was easy but had to add breakers and more qire but worth every penny and no storing water...." Read more

"...Plus we saw a significant drop in our electric bill!" Read more

"...Screw the policy ...! This is a complete RIP OFF - plain and simple.. What a scam.. I think I'm doing something good by using the discarded and..." Read more

"...These are excellent water heaters and the price is great. If you live in the northern US I recommend getting the 36 kw model...." Read more

28 customers mention "Ease of installation"25 positive3 negative

Customers find the installation process of the water heater straightforward. They mention that the mounting is easy, the plumbing is a piece of cake, and the water hookups are easy. Customers also say that the tech support is easy to reach.

"...EcoSmart product because of the customer service, the quality, ease of installation, and the lifetime warranty." Read more

"...The install was easy but had to add breakers and more qire but worth every penny and no storing water...." Read more

"...we're back in business. Tech support was easy to reach and the part was delivered via 2-day service...." Read more

"...The install is relatively easy in terms of the unit...." Read more

15 customers mention "Size"12 positive3 negative

Customers like the size of the water heater. For example, they mention it's space saving, perfect in a small space, and adds more space to area. Some say it provides as much hot water as the largest heaters, yet it takes up less space than a tank.

"...Looks gorgeous and takes up no room. We are looking forward to the future savings." Read more

"...either way, it looks great. less space than a tank...." Read more

"...Today we have unlimited hot water. I love the small space the heater occupies and the simplicity of it...." Read more

"...Blew the transformer on the road – twice. Also super hot water, but very small, no ventilation, no noise, no using up your oxygen burning gas...." Read more

57 customers mention "Heat"38 positive19 negative

Customers are mixed about the heat of the water heater. Some mention that it provides whole house hot water, while others say that it has a tendency to go cold.

"...Now hot water all the time. I have turned on 5 sinks and 2 showers (with the outside temp of 34) just to see what the max I could use at one time...." Read more

"...the kinks to get it functioning the way you like it, it is AMAZING to have hot water after my teenage son showers...." Read more

"...Then the plumber said, “That’s unusual, there is no hot water coming out.”..." Read more

"...It is solid, steady source of hot water for both showers at the same time. Love it. --..." Read more

8 customers mention "Power requirement"0 positive8 negative

Customers are dissatisfied with the power requirement of the water heater. They mention that it draws too many amps and is not effective for a home electrical system.

"...The wiring was pretty strait forward, but these things do pull a ton of amps...." Read more

"...Rightly so too, it is sucking a ton of power when it's on. Note that I have 200 amp service and it only makes my NON LED lights flicker...." Read more

"...faucets a wider range; it took 4 breakers on a new panel and sucks amperage big time whenever hot water is running, causing certain lights to flicker..." Read more

"...It produces very hot water. It has the potential to use a lot of electricity if you try to heat several sources at one time so be sure your panel is..." Read more

6 customers mention "Warranty"0 positive6 negative

Customers are dissatisfied with the warranty of the water heater. They mention that it doesn't last a lifetime and that the heating element is not covered under the warranty if it's not installed by a business.

"The warranty on this product is voided unless it is installed by a licensed plumber and a licensed electrician, which, depending on the location of..." Read more

"...it works but the distributing company has a very bad ,deceptive , warranty policy...." Read more

"...After 4 months we had one heating element go out, NOT COVERED UNDER THE WARRANTY IF NOT INSTALLED BY BUSINESS...." Read more

"Worked for one day and no warranty..." Read more

5 customers mention "Control board"0 positive5 negative

Customers are dissatisfied with the control board of the water heater. They say that it has failed multiple times.

"...by a professional plumber error code stating defective internal electrical issue flashes on...." Read more

"Well, it made our water hot for almost 3 years, but now all of the elements have gone bad...." Read more

"...After 4 months we had one heating element go out, NOT COVERED UNDER THE WARRANTY IF NOT INSTALLED BY BUSINESS...." Read more

"I installed this unit 6 months ago. One of the elements went out about a month ago and now it stops making hot water after about 1 minute of running..." Read more

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Top reviews from the United States

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William H.

Limited lifetime warranty, great customer service.

Reviewed in the United States on April 2, 2018

Pattern Name: HeaterVerified Purchase

This thing is super high quality! I was expecting a cross between an anvil and a hot water heater for the price. I was impressed the second I took it out of the box. I installed mine myself. I had some plumbing refits since I was going from a tank to tankless. The wiring was pretty strait forward, but these things do pull a ton of amps.

I installed mine and all the lights in the house flickered as the heater cores cycled. I had more than enough service to the house. There is a ton of stuff on the web about tankless waterheater doing this, not just EcoSmart. Somewhere outside my house in the power lines there is a loose neutral wire connector. You can forget getting the power company to chase the line and fix it. So now I am freaking out. I have plumbed and wired for this and now I am going to have to send it back and change everything for a tanked heater.....or so I thought.

I called EcoSmart and talked to Juan. I explained to him what was happening. He knew what it was doing and he explained to me that they can help. All I had to do was open the control box and move a jumper that slowed down the cycle. I took me longer to open the box than it did to fix it.

Now hot water all the time. I have turned on 5 sinks and 2 showers (with the outside temp of 34) just to see what the max I could use at one time. I could not tell a temperature difference with all in use.

Last, these things have a limited lifetime warranty.

I would recommend any EcoSmart product because of the customer service, the quality, ease of installation, and the lifetime warranty.

23 people found this helpful

Helpful

Amazon Customer

Fantastic replacement for a 40 gallon tank heater

Reviewed in the United States on February 15, 2024

Pattern Name: HeaterVerified Purchase

We had a 40 gallon tank heater fail, and this water heater was a fantastic replacement. We had a few plumbers bid the project, and this one came in $1,000 less expensive than most options we were looking at.

We did have to hire an electrician to run 4 new circuits, as this unit takes WAY more electricity than a traditional tank unit. But since the unit only runs while you are actively running hot water, it saves money on electricity overall, and gave us a full closet back in storage space. Super happy with this unit after a week.

One person found this helpful

Helpful

BeardedWonder

Make sure to register it within 30 days

Reviewed in the United States on December 19, 2023

Pattern Name: HeaterVerified Purchase

The media could not be loaded.

I bought the unit in May 2023 for an addition I was planning to build onto my house. I didn't open the box or read the manual to learn that there is no warranty unless you register the product within 30 days of purchase until it was too late.

As soon as the unit was powered up it had problems with the motherboard. It would not turn on when the water started flowing. I had two master electricians and a master plumber troubleshoot the unit before calling customer service. Both electricians told me the power was good. They could get the unit to turn on by applying pressure to certain places on the control board or wires but it would become unresponsive after. Eventually it quit turning on completely. I reported the problem to customer service and they sent a replacement motherboard free of charge even though I had not registered the warranty.

With the new motherboard installed the unit works but will only power on 2 of the 4 heating elements. If the water flow exceeds 1.3gpm the unit returns an error code E5, which usually means the water flow is too high for the unit, but the unit should operate with as much as 6gpm at my incoming water temp of 67°F. I contacted customer support again and they cannot help me. They suggested purchasing a new flow sensor, which doesn't make sense because it is displaying the correct flow amount on the unit; the unit just thinks that 1.4+gpm is too much and will not kick on the other heating elements. All heating elements, thermistors, and the fuse have been checked by a master electrician according to the company's troubleshooting guide. They will not replace the unit because I didn't register the warranty in time. So the unit powers one shower but no more, and there doesn't seem to be a way to fix it.

Lesson learned. Make sure to register any appliance purchase within 30 days and be prepared for the spam emails to surge a bit after they sell your information to data farms.

4 people found this helpful

Helpful

Top reviews from other countries

Translate all reviews to English

Zoe Michelle Bushati

Unhappy with this purchase dropping in price by £250 the next day and arrived damaged

Reviewed in the United Kingdom on November 29, 2022

Pattern Name: HeaterVerified Purchase

The item dropped in price by £250 the next day after purchasing this boiler…. To make matters worse the item came with a missing temperature dial and the inserts were broken…. The box arrived damaged externally

One person found this helpful

dd

Very good unit

Reviewed in Canada on May 1, 2023

Pattern Name: HeaterVerified Purchase

This unit requires a lot of power to operate. 4 X 40 amp 240 volts (the double 40amp breakers). Wasn't hard to install but if you don't feel comfortable doing your own electrical, this is not the time to learn.. Hire a professional if you are in doubt. You need 8 slots in your panel. This unit will make your lights flicker but the draw is only during its use, unlike the regular hot water heater that is drawing power pretty much all the time. The system works great and no issues whatsoever.

One person found this helpful

Stéfany

Non installé

Reviewed in Canada on March 21, 2024

Pattern Name: HeaterVerified Purchase

Malheureusement incompatible avec notre domicile on a du retourner et nous avons été remboursé partiellement même si non utilisé très peu satisfait du service reçu et très long délai de traitement

Translate review to English

Dave

I received two times an open box with a defective product in it.

Reviewed in Canada on January 11, 2024

Pattern Name: HeaterVerified Purchase

I purchased the '36kw' model and carefully followed the connection steps, being cautious with electricity. I connected the red wire to the red wire, black to black, and attached the ground wire. I tested each connection with a multimeter. However, when I turned the breaker on, I received error codes S103, H103, r446, P008, etc. Consequently, I returned the defective product, waited for a refund, and decided to take a chance on buying a second one. Unfortunately, it was the same story with the second unit. The box was open, and there was water in the element tube, indicating that it wasn't new but rather an open box with a defective product. I've decided not to try again and will instead pay more for a reliable brand, like Rheem, and purchase it from Home Depot. Yes they refund me, but I loose my time.

Vitaly I.

Excellent value

Reviewed in Canada on May 29, 2022

Pattern Name: HeaterVerified Purchase

Superb water heater, I installed this heater 2 month ago and it works like a charm heats up very fast, and energy bill dropped for then 3 times, I used to have oil water tank heater and it was only enough for couple showers and after I had to wait until water heats up, I highly recommend it to everyone.

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Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater, White

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From the manufacturer

Go Tankless

Product Features

3 Smart Steps for Endless Hot Water

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Technical Details

Additional Information

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Customer Review: Well built unit, responsive customer service - but these systems aren't for everyone

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Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater

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Brand	EcoSmart
Product Dimensions	21"W x 17"H
Color	White
Wattage	36000 watts
Voltage	240 Volts

Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater, White

About this item

Customer ratings by feature

You might also like

From the manufacturer

Go Tankless

Product Features

3 Smart Steps for Endless Hot Water

Product information

Technical Details

Additional Information

Warranty & Support

Feedback

Where did you see a lower price?

Videos

Videos for this product

Customer Review: Well built unit, responsive customer service - but these systems aren't for everyone

Videos for this product

Customer Review: Make sure to register it within 30 days

Videos for this product

Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater

Looking for specific info?

Product guides and documents

Product Description

Product Description

From the Manufacturer

WARNING:

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Important information

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Customers say

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