-Stream oil-heater PPM-70 is designed to heat transformer oil while filling up, replacing or drying transformers. The unit is also designed to heat mineral, machinery, turbine and other oils as well as liquids that do not initiate corrosion of metals a heater is made of. The unit is used at enterprises that repair and service transformer units, power stations and other oil servicing. The unit is designed to be operated indoors as well as outdoors under a shelter.