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Ecosmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology

4.2 out of 5 stars 1,702 customer reviews

Price: $392.37 & FREE Shipping—or get FREE Two-Day Shipping with Amazon Prime
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ECO 18
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  • Mounting of 1 new customer-supplied heater
  • Attaching water pipes and any needed gas lines
  • System test and clean up
  • Haul away of old unit
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Estimate: $949.89
88% positive ratings (76 reviews)
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  • The product is highly durable
  • The product is easy to use
  • Manufactured in China
  • Copper and stainless components designed for efficiency, durability and easy replacement
  • Lifetime warranty for residential use
  • Save up to 60% on your water heating costs with the most advanced, self modulating technology available
  • Never run out of hot water with an ECOSMART tankless water heater.
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$392.37 & FREE Shipping—or get FREE Two-Day Shipping with Amazon Prime In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently bought together

  • Ecosmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology
  • +
  • Aqua-Pure AP430SS Hot Water System Protector
  • +
  • Watts LFTWH-FT-HCN Service Valve Kit for Tankless Water Heater
Total price: $525.32
Buy the selected items together


From the manufacturer

Model ECO 8 ECO 11 ECO 18 ECO 24 ECO 27 ECO 36
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" 3.75" 11.5" x 8" 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

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This item Ecosmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology
Add to Cart Add to Cart Add to Cart Add to Cart Add to Cart Add to Cart
Customer Rating 4 out of 5 stars (1702) 4 out of 5 stars (7) 5 out of 5 stars (2) 3 out of 5 stars (970) 5 out of 5 stars (1) 4 out of 5 stars (119)
Price $392.37 $424.74 $477.01 $329.99 $257.33 $232.00
Shipping FREE Shipping FREE Shipping FREE Shipping FREE Shipping FREE Shipping $13.97
Sold By Amazon.com Amazon.com Lake County Pipe & Supply Co Filter Pro Amazon.com Guillens plumbing and whirlpool parts
Item Dimensions 20 x 20 x 6.5 in 9 x 4 x 13 in 15 x 4 x 19 in 7.25 x 7.25 x 7.25 in 9 x 4 x 13 in 10 x 12 x 5 in

Product description

Style:ECO 18

Product Description

This Smart Technology electric tankless water heater is configured as a "whole home" model for climates where incoming water temperature is 62°F and above. The ECO 18 is capable of heating over 2.5 gallons per minute, which is the equivalent of one water saver shower head (with a 1.5 gpm flow) and one sink with a low inlet water temperature of 62°F, and an output setting of 105° F. Two showers emitting no more than 1.5 gpm each can be run simultaneously when incoming water temperature is above 70° F. Digital temperature control allows you to set your temperature in increments of 1°. All tankless water heaters are sized based on flow rate and temperature rise, and there is a direct relationship between the two. So if used in a cold area requiring a high temperature rise, it will be more limited in the amount of fixtures (gallons per minute) it can heat at one time compared to a warmer climate. However, when sized properly it will provide endless hot water and only consume the energy needed, giving the user complete control. Prior to purchase and installation please verify this model is the right size for the expected demand and electrical requirements. The ECO 18 requires a minimum 150 amp electrical panel for installation with (2) 40 amp double pole breakers connected to (2) sets of #8 awg wire. Plumbing connections are 3/4" NPT. For additional assistance please feel free to contact our support center at 877-474-6473.

From the Manufacturer

This Smart Technology electric tankless water heater is configured for climates where incoming water temperature is 62 Degree F and above. The ECO 18 is capable of heating over 2.5-Gallon per minute, which is the equivalent of one shower head (with a 1.5 gpm flow) and one sink with a low inlet water temperature of 62 Degree F. Two showers can be run simultaneously when incoming water temperature is above 70 Degree F in warmer climates such as South Texas, South Florida, New Mexico, Arizona and South California. These models come with a digital temperature control that allows you to set your temperature in increments of 1 Degree. Prior to purchase and installation please verify this model is the rights size for your hot water needs and electrical requirements.


Product information

Style:ECO 18

Technical Details

Technical Specification

Additional Information

Warranty & Support

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

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on November 12, 2013
Style: ECO 27
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on October 7, 2015
Style: ECO 27|Verified Purchase
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