Modine POR is an oil fired unit heater 

Modine POR oil-fired unit heaters, available in three sizes from 119 to 231 MBH and offering an efficient and reliable way of heating a space, particularly in regions where supplies of other fuels, such as natural gas, may be unavailable, undependable, or interruptible. The units are direct driven propeller fan-type units designed for overhead suspension and horizontal delivery of heated air. Time-tested and field-proven components are engineered into the design of these compact units, which produce comfort heating at the lowest cost through their highly efficient operation.

Models are UL-listed and require fuel oil grade No. 1 or 2, as specified by ASTM (American Society for Testing and Materials) D396-73 Standard Specifications for Fuel Oils or Canadian Government Specification Board, 3-GP-28.