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Both heaters boost the temperature of AC as it flows through them. The horizontal unit has finned pipes heated by hot oil that flows through them. The hot oil must be provided by an external source, such as a thermal fluid heater. The vertical unit is a helical coil heater which has a burner and requires no other heat source. It heats the AC as it flows through the helical coil. Both are used to boost the temperature of AC when it is lower than required for making mix. This may happen when making HMA that includes rubber or polymers. Used at AC terminals and HMA plants.
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