Steam Coil

Top quality steam coils built to your exact specifications for new equipment or replacement in commercial and industrial applications.

Steam Coil Information

Steam coils are used in a wide variety of air heating applications. Steam moves from the boiler to the point of use and releases energy at a constant temperature when it condenses. Because it is simple and economical, steam is a preferred medium for heat transfer in HVAC systems.

There are two types of steam coils – standard steam (single-tube coils) and steam distributing (dual-tube coils). Steam coils are typically used in applications where air temperature is very low at the point of entry. Tube and connection size are assessed to ensure even distribution of steam throughout the coil to eliminate possible pooling of condensate in the coil.

We see a lot of steam coils that need replaced due to freeze damage, since any steam coil can freeze when exposed to freezing temperatures if it lacks proper drainage of the condensate.

We build custom steam coils to match your existing coils, and have a wide range of capabilities to handle your unique situation.

Brands We Replace:
  • Armstrong
  • Heatcraft
  • Aerofin
  • Colmac
  • etc.

Simply give us the specs or let us help you figure out what you need, and we’ll get your steam coils to you as soon as possible.

Steam Coil Design

Steam coils are used to heat air streams. Air moves through the fin contact area, where it is heated by steam moving through the tubes. The fluid enters the coil as a gas and condenses in the tubes, and leaves the coil as a liquid.

Some typical applications for steam coils:

  • Comfort Heating
  • Preheat
  • Boosting Air Temperature in Long Duct Systems
  • Gas Heaters

Steam Coils come in a variety of shapes and sizes, but there are some properties that are common in most steam coils:

  • Rows

    Steam coils operate at the higher temperatures than any other coil type. As such, only 1-2 rows are usually required.

  • Tube Diameter

    Larger tube diameters are common for steam coils. Common sizes range from 5/8" to 1-1/8".

  • Connections

    Connections for Steam coils are typically MPT (Male Pipe Thread) and made from copper. The steam inlet diameter is larger than the outlet by at least 1 size.

Steam Coil Specifications


Constructed from UNS 12200 seamless copper while conforming with ASTM B75, ASTM B88 and ASTM B251d

  • 1" diameter
    • 0.035 or 0.049 wall
  • 5/8" diameter
    • 0.020", 0.025", 0.035", or 0.049" wall


All fins feature continuous die formed construction

  • 1" x 3.000" x 2.598" pattern
    • Waffle or flat corrugation
    • H1100 aluminum or C12200 copper
    • 0.0075" or 0.0100" thickness
    • 4-14 fins per inch
  • 5/8" x 1.500" x 1.299" pattern
    • Waffle or flat corrugation
    • H1100 aluminum or C12200 copper
    • 0.0060", 0.0075", or 0.0100" thickness
    • 4-14 fins per inch


Constructed from UNS 12200 seamless copper while conforming with ASTM B75, ASTM B88 and ASTM B251d

Headers range from 0.75" nominal diameter (0.875" outside diameter) to 5" nominal diameter (5.125" outside diameter)


  • MPT (Male Pipe Thread)
    • Copper (Type "L")
    • Steel (Schedule 40)
    • Red Brass
  • FPT (Female Pipe Thread)
    • Copper (Type "L")


  • 16 or 18 gauge
    • Galvanized Steel (G90)
    • Stainless Steel (304)
    • Stainless Steel (316)
    • Aluminum (H11)

Steam Coil Performance

Coil performance varies greatly from application to application. Flow rates and temperatures for both fin and tube sides will greatly influence the performance characteristics for any given coil.

We have state of the art software that we can use to quote performance. For a detailed performance run tailored to your situation, please email with as many of the following details as you have available:

  • Coil model number
  • Duct size
  • Air Flow Rate in CFM (cubic feet per minute)
  • Entering Air Dry Bulb Temperature in °F
  • Entering Air Wet Bulb Temperature in °F (cooling coils only)
  • Fluid flow rate in GPM (gallons per minute, for water coils only)
  • Entering fluid temperature in °F
  • Desired capacity in MBH or tons
  • Desired leaving air temperature in °F

Sizing Guidelines

Blank Drawings

Related Applications:

Replacement Coil