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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 1,724 customer reviews

Price: $425.00 & FREE Shipping. Details
In Stock.
Ships from and sold by Amazon.com. Gift-wrap available.
ECO 18
Expert replacement + haul away | See more options for first-time installation More options

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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
  • Some areas require special permits for this service. Depending on your location, pro may need to acquire proper documents at an additional cost.
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  • Pro will contact you within 1 business day to schedule
  • Kick back and only pay when the job is done
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Estimate: $1,222.49
88% positive ratings (80 reviews)
    This fits your .
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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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$425.00 & FREE Shipping. Details 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
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  • Aqua-Pure AP430SS Hot Water System Protector
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Total price: $559.47
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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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Customer Rating 4 out of 5 stars (1724) 4 out of 5 stars (9) 3 out of 5 stars (980) 4 out of 5 stars (7) 3 out of 5 stars (5) 4 out of 5 stars (232)
Price $425.00 $362.00 $329.99 $477.01 $257.30 $221.97
Shipping FREE Shipping FREE Shipping FREE Shipping FREE Shipping FREE Shipping FREE Shipping
Sold By Amazon.com Amazon.com Filter Pro CPO Outlets Filter Pro iR Tankless
Item Dimensions 20 x 20 x 6.5 in 9 x 4 x 13 in 7.25 x 7.25 x 7.25 in 15 x 4 x 19 in 9 x 4 x 13 in 12.8 x 14.29 x 4.41 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

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Top customer reviews

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