• Description
  • Specification
  • Sizing & Installation
  • Replacement Parts

ECO 8 | 8kW Electric Tankless Water Heater

Ideal for a small apartment with one bathroom in a warm climate


The ECO 8 is ideal for a small apartment with up to 2 people. In warm climates the ECO 8 can provide hot water for one shower and a sink simultaneously. Use the EcoSmart interactive sizing guide to find out if this model is ideal for you.

ECO 8 Features:

  • Savings of up to 50% on water heating costs
  • The most advanced, self-modulating technology available, meaning the ECO 8 will adjust how much energy needs to be input based on how much hot water is needed
  • Stylish and advanced design that is pleasing to the eye
  • Digital temperature control in 1-degree increments allows control of hot water
  • Copper and stainless components designed for efficiency, durability and easy replacement
  • Compact size saves valuable storage space


Voltage 240
Phase Single
KW 8 kW
Elements 1 x 7.2 KW @ 220 V
Amperage Draw 33 Amps
Required Breaker 40 DP
Required Wire 8 AWG
Electrical Panel 100 Amps
HZ 50/60
Pipes fittings 1/2" CF
Dimensions (in.) 11.5"H x 8"W x 3.75"D
Weight 4.75 lbs.
Exchanger Stainless Steel
Protection Thermal Auto
Temperature Control Digital
Activation flow .25 GPM
Energy Efficiency 99.8 %
Certification: ETL Listed to UL 499 & CSA
Warranty Lifetime*


Installation of your EcoSmart tankless water heater requires certain wiring and electrical specifications. To ensure maximum performance and to maintain your warranty, it is recommended that you have a licensed professional install the unit. The sizing chart below is based off a 240 volt electrical service. If you do not have 240 volts or are unaware of your electrical service please contact our customer service team at 877-474-6473 for additional product sizing support.

Click here to download the installation manual


CB NF SML - $41.27

Control Board

Compatible with:

ECO 8 & ECO 11


ENC FSML - $25.64

Front Enclosure

Compatible with:

ECO 8 & ECO 11


FSA NFSML - $15.12

Flow Sensor Assembly

Compatible with:

ECO 8 & ECO 11

HE 80240

HE 80240 - $41.07

Heating Element 8 KW @ 240V

Compatible with:

ECO 24


PSC 6 - $30.88

Power Supply Cord #6

Compatible with:

ECO 11


TRC 1HESML - $27.43

Triac 1st Heating Element

Compatible with:

ECO 8 & ECO 11

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