EcoSmart Tankless Water Heater Not Heating

Why Is My EcoSmart Tankless Water Heater Not Heating?

Your EcoSmart Tankless Water Heater is not heating at all if the unit gets no power or the unit is wired incorrectly. 

Besides, too low flow rate and internal part failure can also cause the water heater to not heat the water.

Throughout this troubleshooting guide, I will break down each of those culprits that prevent your tankless unit from heating. 

Without further ado, let’s dive in. 

Table of Contents

EcoSmart Tankless Water Heater Not Heating [3 Easy Solutions]

This chapter will walk you through every troubleshooting step to fix those issues that are responsible for the unit to not heat the water. 

No Power or Incorrect Wiring

The unit will receive no electric power if there is an issue with your home’s wiring or the circuit breaker is at fault. 

And guess what, you can’t turn on the unit if it gets no electric power. It’s like revving up the engine without having any fuel in the fuel tank. 

Nonetheless, wiring your EcoSmart Tankless Water Heater incorrectly can stop the unit from heating or working. 

How To Fix: 

Start with checking the circuit breaker for the water heater. Make sure you turn it on. Otherwise, no electric power will pass to the unit. 

Once you verify the circuit breaker for the unit is on but getting no power, go forward to inspect the electric connection of your house. 

I highly recommend you call a professional if you are not handy. 

However, you can follow the below steps to test the electrical connection, which will let you know whether there is an issue with the unit or the electrical connection. 

  • Remove the two screws located at the bottom of the unit that hold the front cover in place.
  • Pull out the front cover from the unit. 
  • Take a voltmeter and place one probe on the black wire terminal and the other one on the red wire terminal. It should give a reading of 208-240V. 
  • If the reading you get is 0 or low voltage reading, I bet there is no issue with the unit. The problem is your home’s wiring or circuit breakers. 

Note: The voltage reading you get at the terminals will depend on how many kW your unit can pull. 

In this case, you must call a qualified electrician to solve the electrical connection issues of your home. 

Sometimes wiring the unit incorrectly will prevent the unit from working. The best bait to fix this issue is to call the technical support team. 

Low Flow Rate

Every water heater, either it’s a tank or tankless unit, has an activation flow rate. 

If the water flow rate goes below the minimum activation flow rate, you can’t turn on the unit. In other words, your water heater won’t heat the water at all. 

When it comes to EcoSmart Tankless Water Heater, the minimum water activation flow rate should be 0.3 GPM. 

You should increase the flow rate if the water flow rate is less than 0.3 GPM. 

Internal Part Failure

Water is flowing but the unit is not heating. The outgoing temperature is similar to the cold water supply. Turns out, the display doesn’t light up. 

When you encounter such a situation mentioned above, the problem is with the internal part of the unit. 

Failure of the internal parts like the thermistors, heating elements or heat exchangers will prevent the water heater from heating the water. 

How To Fix:

It’s always recommended to call a professional if there is a problem with the internal parts of the unit. 

But if you are a DIY nerd, this guide on EcoSmart Tankless Water Heater Troubleshooting will help you a lot. 

In that article, I discussed every troubleshooting step to check those internal parts. So, read that guide and fix the internal issue of your water heater. 


Water heater not heating means you will get no hot water. So, you must fix this issue right off the bat. Just go along with the troubleshooting steps I mentioned and resolve the problem. 

Similar Posts

Leave a Reply

Your email address will not be published. Required fields are marked *