Ecosmart Eco27 27kW 240V Electric Tankless Hot Water Heater


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3 Items $465.95
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Retail Price: $599.00
Weight: 16.40 lbs

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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
40°F 45°F 50°F 55°F 60°F 65°F 70°F 75°F 80°F
ECO 8 .75 GPM .80 GPM 1.0 GPM 1.2 GPM 1.3 GPM 1.4 GPM 1.5 GPM 2.0 GPM 2.2 GPM
ECO 11 1.3 GPM 1.3 GPM 1.5 GPM 1.7 GPM 1.9 GPM 2.0 GPM 2.3 GPM 2.7 GPM 3.0 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.

Example: If you usually use about 2.5 gallons per minute (one shower with a water-saver showerhead and one hand sink) simultaneously, find the 2.5 GPM on the chart or the number closest to it. If the number is highlighted in GREEN, then it is the correct model for you. If it is highlighted in YELLOW, that means you can get by with it. If it is highlighted in RED, you have to consider a more powerful model.

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.

How the temperature dial and display work

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 between 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.

This product is 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.



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 (in.) 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
Energy efficiency 99.8% 99.8%
Certification ETL Listed to UL 499 & CSA

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

What savings do you get with ECOSMART's Tankless Water Heater?

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 24/27 Electric Tankless Hot Water Heater

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.

FAQ (Frequently Asked Questions)

Q1: Can I use this like a boiler, for radiant floor heating, baseboard heating, hydronic or closed-loop applications?

A1: Yes. Most radiant floor/baseboard, or hydronic or boiler, heating applications call for water heating greater than 140°F. Most of these hot water heating systems operate best at about 160 degrees F. Older, oil-fired boilers have a setpoint of 200°F. The factory-set maximum temperature for the Eco 24 and Eco 27 is 140°F. Here is how to set it for an output temperature of up to 180°F. Open the case of the heater. At the very top of the jumper strip is a jumper marked "180". With power completely and certainly off, place a jumper on these two pins. When power is restored, the unit will output up to 180°F, according to its heating capability. For boiler service for the Eco 27, getting 160°F water requires an incoming water temperature of at least 114°F. In a closed-loop system, the Eco 27 will achieve this in a short time for residential applications.

Most other hot water heating systems provide either 1 GPM or 4 GPM. With the Eco 27, according to our temp rise (or "delta-T") chart above, you will get a temperature rise of 184 degrees F at 1 GPM. Most other hot water systems operate with a delta-T of about 17°F or less. So, for the 180°F output setting, the Eco 27 must have have water inflow of 163°F. But the Eco 27 can provide 2.5x to 10x the minimum needed flow rate of 4 GPM. Therefore, the Eco 27 is a perfect solution for boiler and radiant floor heat. Plus, it is small, smart and silent. If you're considering this unit for hot water baseboard or hydronic service, and you have a 200 amp electrical panel, the Eco 27 is a good choice.

A general, simplified design is as follows. Each zone returns or feeds into a header which then feeds the pump. The pump feeds into the heater's cold water inlet connection. From the heater's hot water ouput, water flows into a header which then splits into your individual zones. Put the water on/off valves on the return side. Add a standard expansion tank to hold the system at 15 PSI. The cold water inlet is through a one-way RV-type water valve.

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Apr 22, 2016
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May 8, 2017
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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 9, 2016
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