In planning a new HVAC project, one of the main criteria after determining your specific heating requirements is determining your heat source. The two most common sources are direct and indirect fired heaters.
Direct fired heaters are both more efficient and less expensive than indirect fired heaters. However, there are some cases where an indirect fired heater is the better choice. Having a thorough understanding of all of the differences between these two heater types will ensure you choose the optimal solution for each project.