Below is a list of Process Heaters manufacturers from Mt. Airy, Maryland. Process heaters describe a broad grouping of enclosed devices used to transfer heat indirectly to a process material. These mechanisms are seen predominantly in industrial and commercial settings and while sizes are variable, most process heaters are very large. Typical applications include the processing of crude oil, emulsions, edible oils, water, steam, air, nitrogen, reaction heaters, asphalt, natural gas, catalyst reduction, reactivation burning and many other manufacturing applications that require elevated temperatures.