Water is the preferred media for heating coils.
Provide hot water heating coils with copper tubing and copper or aluminum fins. If steam is selected, provide distributing type coils. Take particular care with the piping, trap and control installation details to prevent flooding of the coils with condensate. Heating coils shall have a maximum of 12 fins per inch. Use of this spacing reduces early coating with airborne dust, eventual plugging and facilitates cleaning when necessary.