Learn More About Indirect Fired Heaters

In our last article, we discussed the benefit of using indirect heaters in construction and other jobs. This time we’ll take a step back, discuss how indirect fired heaters work, and tell you about another great brand. 

The Difference Between Direct and Indirect Fired Heaters 

Unlike a direct fired heater, which heats industrial and commercial areas using gas fired directly into the burner, indirect fired heaters do not have an open flame. In an indirect fired heater, air is heated by passing over a heat exchanger. This allows the combustion by-products to stay within the heat exchanger until exhausted through a flue. 

Why does this matter? When you’re dealing with a direct fired heater, you need proper ventilation and a minimum of 20% fresh, outside air. Because of these requirements, and the potential for combustion by-products, these heaters aren’t allowed on all job sites. There are places and situations where they simply aren’t allowed. 

With an indirect fired heater, no by-products of combustion are introduced into the workspace. So, they’re the preferred choice in closed, indoor spaces. There’s less risk and greater reheating ability with these types of industrial heaters. 

Comparing Veloci and Flagro Indirect Heaters 

In our last article, we highlighted Veloci heaters, but we would be amiss if we didn’t also feature the Flagro indirect heater line. 

Veloci heaters have an advantage as far as price and weight are concerned. They’re easier to move around than Flagro indirect heaters. However, the Flagro line is known for being durable and well-engineered. They’ve modified one of their heaters with a larger gas tank for up to 30 hours of continuous use, which is a huge plus for contractors. In many ways, Flagro indirect fired heaters are premium. We often recommend them to our clients who do building restoration, in particular. 

More Information About Indirect Fired Industrial Heaters 

An indirect-fired heater is a common choice for climate control on construction sites, outdoor events, and other spaces requiring temporary heat or decontamination. The heater can be installed for temporary use indoors or outdoors. If installed indoors the flue must be vented to the outdoors by an HVAC professional. Again, with indirect fired heaters, there is no exposed flame or fumes to be concerned about. You can be assured that fresh, clean air will be delivered into the structure without the fear and concern of flames shooting out of the front of the heater. To further ensure safety, all heaters come standard with an on/off thermostat, which means you do not have to manually adjust the gas flow to control the temperature.

Our professional team has made all things related to heat treatment and airflow our expertise, and we are proud to provide a wide variety of portable heaters. Our staff has completed thousands of treatments, and personally use this equipment in the field. Rest assured, you’re not just purchasing equipment, you’re getting the support of experienced professionals in the industry! Regardless of what kind of portable heater you need, we offer top quality models with all of the accessories needed for optimal performance.

How Can Thermal Flow Assist You? 

Do you have additional questions about our direct- and indirect-fired industrial heaters? Let us know! We’re happy to list the pros and cons and give you industry insights as we help you choose the best machinery for your business. 


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20" to 16" Dual Duct Adaptor

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