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They pull in outside air and push it over an open flame. This hot air is then blown straight into a space that needs to be heated. These heaters can generate warmth for a well-ventilated area. A distinct kind of direct fired heater called a makeup air heater has baffling to cover the flame and is often used in the construction industry when the building envelope is somewhat loose. Because these heaters pull 100% outside air, they will help pressurize a space and deter air from entering the space.

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They blow air over a series of electric coils and into the space they’re heating. Depending on their size, they could require a 240-volt or 480-volt power source. They’re great for providing quiet, emissions-free temporary heat for manufacturing facilities, event tents and building additions.

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They draw air from inside a space, pull it over a stainless steel heating element and then blow the heated air back into the space. Typically, they are placed outside a building and pull return air through ductwork. However, they also can be used inside a space as long as the flues are ducted out of the building.

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Central heating units (CHUs) are portable hot water heaters. They tie into a building’s existing boiler system to heat and circulate nonpotable water to heat the building. Hydro heat pros (HHPs) are similar, but they have two heat exchangers on the back so they can connect with potable or nonpotable water systems — or both at the same time. CHUs and HHPs temporarily replace a failed hot water heater.

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They include a diesel engine, which powers two friction plates that rub together to create heat. A key feature of flameless heaters is a butterfly valve that shuts down the engine if it starts to take in combustible air. Flameless heaters are the right option for warming people and equipment in the petroleum industry.

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