Heated Desiccant Dryers (also known as Regenerative Desiccant Dryers) provide more consistent dew point than heatless desiccant dryers and lower dew points than refrigerated dryers. Instead of injecting processed purge air into the regeneration tower, heated dryers pre-heat the purge air before it is used for regeneration. In a heated desiccant dryer, typically 3-5% of process air is used for purge as opposed to the 15% or more used in heatless. Heating the regenerating purge air also extends the dryer cycle time to several hours, preventing dewpoint spikes.

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