iHeat Tankless Water Heater Not Heating

iHeat Tankless Water Heater Not Heating [3 Easy Solutions]

You turn on your iHeat tankless water heater. But the heck is- it doesn’t heat the water completely and you don’t find any clue behind it. 

Yeah, I can imagine your problem. No-heating means no hot water and thinking of a day without hot water is beyond the imagination. 

Fortunately, this guide on iHeat Tankless Water Heater Not Heating will disclose all the culprits that stop the unit from heating at all. 

So, stay in tune with me till the end.

Table of Contents

Why Is My iHeat Tankless Water Heater Not Heating?

Your iHeat Tankless Water Heater will not heat if there is no power or insufficient power to the unit. Turns out, too low flow rate or inadequate water pressure and internal parts failure are responsible for the unit to heat the water. 

Below I will walk you through every troubleshooting step you need to follow to fix the no-heating problem. 

Here we go. 

1. No Power Or Insufficient Power

No power or the unit receives insufficient power is the number one reason that prevents your iHeat water heater from heating completely. 

If the breakers at the main electrical panel get tripped, no electric power will supply to your tankless water heater. And you already know, it’s impossible for the water heater to heat the water when it gets no power. 

Turns out, wiring your iHeat tankless unit incorrectly can cease the ability of the unit to heat the water. 

How To Fix: 

At the first stage, check the breakers at the main electrical panel. If they get tripped, just flip them up to let them supply electric power. Otherwise, it will be better to call a certified electrician if the breaker itself is at fault. 

Next, ensure you wire your water heater correction. Call your electrician to double-check the wiring of the unit and fix the wiring issue if needed. 

2. Flow Rate or Water Pressure Is Too Low

The activation flow rate for your iHeat tankless water heater is 0.25 gallons per minute. If the flow rate goes below to this level, you can’t turn on the unit. In other words, your iHeat unit won’t heat the water. 

Similarly, when the water pressure goes down  than the recommended level, the water heater will fail to heat the water. 

How To Fix: 

Increase the flow rate and it will solve the no-heating issue of your iHeat Water Heater. If you don’t know how to fix the flow rate issue, don’t hesitate to call a qualified plumber. 

Next, ensure you have at least about 20 PSI of sustained water pressure at the unit. Otherwise, you can’t turn the unit on- let alone getting hot water out of it. 

3. Internal Part Failure

Forget the tankless unit to heat the water if the internal part of it gets damaged. Here the internal part means the PCB board, flame sensor, heat exchanger, fan, and other other internal components of the unit. 

If any of those parts are at fault, you must replace them. Call a certified plumber or the technical support team for further assistance. 


Why is my tankless water heater not getting hot enough?

Your tankless water heater won’t get hot enough due to the following reasons: 

  • You may set the temperature too low.
  • Cross wiring
  • Water flow rate may cross the physical heating capacity of your tankless water heater 
  • The unit is not getting the voltage you need to activate the water heater. In specific words, the unit may receive voltage less than 240V. 
  • Cross Plumbing
  • Thermal loss due to long pipe run

Is there a pilot light on a tankless water heater?

No, you can’t find a pilot light on a tankless water heater.

How do you ignite a gas tankless water heater?

It’s simple. Just turn the gas control valve counterclockwise to turn on the gas supply. Then, turn on the Power button on the unit or at the electric breaker. 


Three culprits like no power or insufficient power to the unit, too low flow rate and internal part failure are responsible for the unit not heating the water. 

To solve this issue, just follow the troubleshooting tips I mentioned and bring back your iHeat Tankless Water Heater back into its normal operating condition. 

If you can’t resolve the no-heating issue following this guideline, I bet the unit is going through a more complex problem. In this case, it would be better to call a professional to take care of the issue. 

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