EcoSmart Eco27 27kW 240V Electric Tankless Hot Water Heater


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Weight: 16.40 lbs

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27kW EcoSmart ECO27

The EcoSmart Large ECO 27 Electric Tankless Hot Water Heaters let you enjoy endless hot water when you want it, only when you need it. Go Tankless and Save.

Get rid of your tank and get:

Energy savings: The EcoSmart Smart Technology electric tankless water heater can save you up to 60% off your water heating bills. Even if it costs the same or less than a regular tank water heater. It has an energy efficiency rating of 99.8%. It will pay for itself many times over.
Extra space: EcoSmart's tankless design saves you a large amount of space for storage (see picture below).
Luxury and comfort: Never run out of hot water.
Convenience: The Digital Temperature Dial lets you easily set your preferred maximum hot water temperature at up to 140°F. Could you ever do that with your old hot water tank?
Safe Self Modulating Technology: Prevents spikes in your electrical current.
30-Day Money-Back Guarantee and a Lifetime Warranty

These water heaters are the most powerful Smart Technology electric tankless units in the market today. They are engineered for both cold climates, with incoming water temp that may drop below 45°F, and warm climates. They are ideal for homes both in the northern US and Canada, and Southern US homes, and homes that have generally more demanding water usage requirements. This water heater will work with large Roman-style or Jacuzzi tubs.

How to choose your water heater model

Step 1: Add up the flow rates of all the water use points that you expect to simultaneously use. It does not matter whether your home has 2 showers, 4 sinks, a dishwasher and a clothes washer. What only matters is which of them you expect to run at the same time. See Chart A.

Step 2: Determine your coldest incoming water temperature of the year.

Step 3. Take your info from Step 1 and 2 and look up the info on Chart B.

Step 4: Ensure you have sufficient electrical service. See "Electrical Requirements" chart below.


Chart A

Flow rate guidelines for various hot water applications.

This chart is based on the use of water-saver showerheads rated at 1.5 GPM and water-saver aerators for sinks rated at 1.0 GPM. The number of showerheads and sinks next to each model reflects the model unit's capacity to make hot water simultaneously with the unit's temperature control set to 105°F. Note: The shower temperature that most people prefer is between 98°F to 105°F.

 EcoSmart Eco 24/27 Electric Tankless Hot Water Heater


Chart B

Inlet Water
Temperature →
40°F 45°F 50°F 55°F 60°F 65°F 70°F 75°F 80°F
ECO 8 .85 GPM .90 GPM 1.0 GPM 1.1 GPM 1.2 GPM 1.4 GPM 1.5 GPM 1.8 GPM 2.2 GPM
ECO 11 1.35 GPM 1.45 GPM 1.6 GPM 1.8 GPM 2.0 GPM 2.2 GPM 2.5 GPM 3.0 GPM 3.5 GPM
ECO 18 1.9 GPM 2.0 GPM 2.2 GPM 2.4 GPM 2.7 GPM 3.1 GPM 3.5 GPM 4.1 GPM 5.0 GPM
ECO 24 2.5 GPM 2.7 GPM 3.0 GPM 3.3 GPM 3.8GPM 4.1 GPM 4.7 GPM 5.4 GPM 6.5 GPM
ECO 27
(this page)
2.8 GPM 3.1 GPM 3.4GPM 3.7 GPM 4.2 GPM 4.8 GPM 5.2 GPM 6.1 GPM 7.3 GPM

This chart presents the flow rates at each inlet temperature with the unit's temperature control setting at 105°F.

Electrical Requirements

Before you purchase an EcoSmart, please make sure that your home has sufficient electrical capacity to run it. Refer to the following chart for electrical requirements:

Model Recommended
Maximum Amperage
@ 240 V
Recommended Household
Electrical Service
Recommended Minimum
Wire Gauge
ECO 27 3 x 40 AMPS DP 112.5 AMPS 200 AMPS 3 x #8 AWG Copper
ECO 24 3 x 40 AMPS DP 100 AMPS 200 AMPS 3 x #8 AWG Copper
ECO 18 2 x 40 AMPS DP 75.0 AMPS 150 AMPS 2 x #8 AWG Copper
ECO 11 1 x 60 AMPS DP 57.0 AMPS 125 AMPS 1 x #6 AWG Copper
ECO 8 1 x 40 AMPS DP 33.0 AMPS 100 AMPS 1 x #8 AWG Copper
POU 6 1 x 30 AMPS 29.0 AMPS 100 AMPS 1 x #10 AWG Copper
POU 3.5 1 x 30 Amps 29.0 AMPS 100 AMPS 1 x #10 AWG Copper

Wire gauge and breaker size must meet all applicable provincial, state, local, and national electrical codes for your area. These are only guidelines that may apply to most installations. Some codes require use of an electrical sub-panel, especially when heater isn't mounted within the line-of-sight of the main electrical panel. Wiring should be sized to maintain a voltage drop of less than 3% under load.

If your home is already equipped with a large number of electrical appliances, you may require a larger electrical service than the one recommended above. The above chart contains only guidelines. Please consult with an electrician before placing an order.


Download Installation and Owner's Manual
Download Troubleshooting Guide for Electricians


  ECO 24 ECO 27 (this page)
Voltage 240 240
Phase Single Single
KW 24 KW 27 KW
Elements 3 x 8 KW @ 240 3 x 9 KW @ 240
Amperage Draw 100.0 Amps 112.5 Amps
Fuse type and size 3 amp, 250 volt, fast action inline fuse
Required Breaker 3 x 40 DP 3 x 40 DP
Required Wire 3 x 8 AWG 3 x 8 AWG
Electrical Panel 200 Amps 200 Amps
HZ 50/60 50/60
Pipes fittings 3/4" NPT 3/4" NPT
Dimensions (inches) 18 x 17 x 3.75 18 x 17 x 3.75
Weight 13.75 lbs. 13.75 lbs.
Exchanger Copper Copper
Protection Thermal Auto Thermal Auto
Temperature Control Digital Digital
Activation flow rate 0.3 GPM 0.3 GPM
Minimum PSI 25 25
Maximum PSI 150 150
Energy efficiency 99.8% 99.8%
Certification ETL Listed to UL 499 & CSA
Warranty Lifetime on exchangers, electronics, and elements. (5 years outside of continental US and Canada)


Save space. Look at how much space you save with our on-demand hot water heater compared to a water heater tank.

 EcoSmart Eco 24/27 Electric Tankless Hot Water Heater

Frequently Asked Questions ("FAQ")

Q1: How do I replace the heating elements on the ECO 27?
A1. Replacing the heating elements on the Ecosmart ECO27 tankless water heater is fairly simple. But since removing the water heater cover is necessary, and there is a risk of injury or death due to high voltage, Ecosmart recommends that a licensed electrician do the work. Here are the steps:

1. Disconnect power.
2. Remove cover.
3. Unscrew the two steel screws on the end of the element plug and remove the two wires.
4. Unscrew the element from the heating chamber. The ECO27 uses 3 elements, each screwed into its own heating chamber.
5. Tightly, securely screw in new elements and replace wires and cover.

The ECO 27 uses three heating elements which are available for purchase here.

Q2: How do the temperature dial and display work?
A2: When water is flowing through this tankless heater, the digital display on the front of the unit shows the water heating temperature that you have set using the dial. To set the temperature, start by turning on any water faucet. The digital display will light up and give you the current temperature setting of the unit. To increase this setting, turn the control knob to "Increase" or "Decrease" your temperature setting. You can set the temperature at any level between 80°F (27°C) and 140°F (60°C). To change the digital display from Fahrenheit to Celsius, simply press the control knob for 3 seconds. Most people feel comfortable showering or bathing at a temperature between 98°F and 105°F (37°C to 41°C). We recommend that you set the output water temperature of your water heater at either 105°F or 110°F (approximately 41°C or 43°C). This will ensure you have adequate hot water to meet all of your household needs while also maximizing your available water flow rate, reducing the risk of scalding to children and the elderly, and increasing the energy savings you achieve.

Q3: Can I install the ECO 27 outdoors?
A3: Ecosmart tankless water heaters are designed for indoor installation. Installation outdoors is acceptable only if mounted an enclosure that protects it from dust, debris, rain, splashed water, insects, and direct sunlight. It must not be installed where it may be exposed to freezing temperatures. If any moisture is inside it when it freezes, the warranty is void.

Q4: How much can I save with ECOSMART's Tankless Water Heaters?
A4: The primary difference between savings associated with storage tank heaters compared to tankless heaters is the amount of energy and time consumed during operation. An electric tankless water heater consumes more energy compared to a tank heater during its use, but it consumes energy for a drastically shorter period of time. The result is a reduction in water heating costs by up to 60%.

The image below contains a visual representation of the concept mentioned above using data taken from independent third party testers. It shows how the storage tank heater keeps drawing power even after the need for hot water has long ceased. In this example, the tank heater used energy for 34.5 minutes just for a 10-minute shower. It also used a total of 2.5 kWh, in comparison to the ECO 27 which consumed just 1.6 kWh. The steadiness in the data represented about the ECO 27 is also an accurate indication of how precise the Self-Modulating Technology is, allowing for very minimal differences in energy consumption.

 EcoSmart Eco 18 Electric Tankless Hot Water Heater, Medium

PSC (Product Safety Consulting, Inc.) is a product testing firm recognized internationally and accredited by several reputable organizations. PSC administered numerous tests that simulate daily hot water usage and then compared the energy consumption results between an ECO 27, the largest model available from ECOSMART, and a 40 gallon water heater from Rheem. Based on an average ten-minute shower consuming two gallons per minute, a 37% savings in energy consumption was confirmed with the ECO 27. This figure is based on usage comparison and does not take into account energy loss associated with Cycling Loss and Standby-by Loss which may be accountable for up to 20% energy loss. This loss included, the ECO 27 uses up to 57% less energy compared to a standard electric storage tank water heater.

Installation Help and Recommendations

We recommend that you have a professional tankless water heater installer review the above recommendations. Need an installer? Get 4 FREE Tankless Water Heater Installation Estimates Now. It's Quick and Easy!
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4 most useful customer reviews
May 8, 2017
This customer purchased this item.
I absolutely love this tankless water heater, and doing business with was a wonderful experience! They are very nice and very helpful. They price match and see to it you get your purchase shipped fast to you, and package your purchase very well too, to assure you receive it in great condition. I couldn't be happier!
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Apr 22, 2016
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Tony Dye
May 6, 2020
This customer purchased this item.
Thank you for answering the phone, providing excellent service, AND having patience with me on the most recent project you helped me order. My customer was very satisfied that all the pieces came together and we were successful in providing the service we have strived to achieve, this could not have happened without YOU, and I thank YOU for all you did, and are doing, to help people enjoy the things in life that are certainly attainable with the help of others. The customer went from having no hot water to hot water within around a 24 hour period. You helped me navigate through this almost impossible feat to arriving at success.

Thank you,

Tony :-)

Advantages: The best

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Apr 9, 2016
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