HX-Series liquid-to-air Heat Xchangers can turn a conventional Ground Heater unit into an effective air heater. The heat exchangers receive hot Heat Transfer Fluid from the hydronic heater, which heats individual coils. A built-in fan draws cooler air from the workspace and pushes it across the coils. The result is hot, dry, clean air. Three Heat Xchanger models range in capacity from 50,000 to 200,000 Btu/hour, and in maximum airflows of 710 to 2,400 cubic fpm.