Specializing in Superior Quality Coils - Made in the USA

1683 Rock Hill Hwy.
Lancaster SC 29720

Hot Water Booster Coil

Hot Water and Booster Coils


Booster coils are typically just smaller-sized hot water coils. Generally booster coils are made without headers, which saves on manufacturing costs. Many people also note that these coils are a common inventory item that is more likely to be held in stock than other types of coils.Otherwise, there is no difference between a "hot water coil" or "booster coil".

Materials: Booster coil and Hot water coil may use copper, the most commonly used material for tubes, may come in a variety of tube wall thicknesses to handle different applications. Most tubes are designed with either ½ to 5/8” O.D. tubes, increasingly however, low capacity coils are being designed with 3/8” tubes.

capacity coils are being designed with 3/8” tubes.

Even though there are many choices for coil materials and features, unless there is a significant design reason to specify something unique, most coils can be purchased based on cost alone, giving the buyer an opportunity to use “standard” coil materials to save money.

Aluminum is commonly used for the fins because of its good heat transfer characteristics and low cost. There are a variety of fin designs available that may offer enhanced heat transfer or air pressure reduction.

Coil frames (also called casings or flanges) are normally galvanized. Connections are typically copper, steel or brass

Hot Water Coils

Coils are designated as hot water when they are one or two rows deep. Most of the time a hot water coil has 60° F entering air and a hot water temperature of anywhere from 140° F to 200° F. The spread between the entering water and the entering air is often 100° F to 140° F, so you just don't need very many rows deep to do the required load. Just about every hot water coil that you run across will be one or two rows. Is it possible to have a three or four row hot water coil? Sure it is, depending on your entering conditions! There are heat recovery or low temperature hot water situations when a coil has to have more rows to do the job, sometimes three or four rows.

In a central air system, heating coils are connected to air handlers as a means of providing forced-air heating. This type of setup enables the combination of heating and cooling systems for the purposes of saving space, as well as reducing energy and installation costs. A complete system includes the hot water coil, an air handler/direct expansion coil assembly, a condenser and/or furnace, and a water heater or boiler. The coil may also contain a pump to keep water circulating for space heating, leaving the pump in the water heater to be used to provide usable hot water for taps and nonheating residential devices.

Types Of Heating Coils

There are many variables to consider when recognizing what to replace your existing heating coil with. Among them are:

  • Casings: Available in 16-gauge galvanized or stainless steel, aluminum or copper
  • Connections: DX, Condenser & Heat Reclaim connections are copper sweated, while DX distributor connections are either standard or hot gas. In addition, certain optional steel connections are threaded--either in MPT or FPT variety. Supply connections are set on both ends of steam distributing coils, while copper MPT connections are used for the water and steam coils.
  • Fins: Made of either 6- or 10-gauge aluminum or 6-gauge copper, and spaced using three-eighths, one -half inch or five-eighths inch OD tubing, which provide, respectively 10 to 22 fins per inch, 10 to 16 fins per inch or 4 to 16 fins per inch.

    In addition, all joints are hand-brazed. Brazing is a bonding method by which a filler material or alloy is melted and distributed between parts via capillary action. Special coatings and intertwined circuitry are among other variable options, depending on the hot water coil setup.

Replacing A Hot Water Coil

Remove the access panel from both sides of the cabinet. Then take out the knockouts for the coil's stubouts. Remove two galvanized strips from the package, and install an angle strip with notches resting in the drain pan and the half-inch flange pointing toward the blower. Install the other angle strip at the top of the coil, with the half-inch flange resting atop the cooling coil, pointing to the rear of the unit. Place the clip as high as possible on this strip, securing it to the end plate of the cooling coil. These strips are used to prevent air from bypassing the heating coil and also serve as support. Then install the coil through the access door on the opposite side of the connections. The coil should be raised slightly in the drain pan, letting the stubouts align with the cabinet's knockout holes. The hot water coil may now be secured to the cooling coil by fastening two clips over the cooling coil and hot water coil end plates.

Booster Coils

Booster coils are duct-mounted reheat coils designed for air heating applications using hot water. Used in general heating applications, booster coils are provided with a variety of casing configurations including fully flanged, slip and drive or end plates only.

  • Low pressure steam
  • Shipments in 24 hours
  • Surefin matches existing dimensions and performance for coils you're already using.

Hot Water Coils

Ideal for a wide variety of basic, custom, and heavy-duty industrial applications, heating coils are designed to meet a variety of heating applications. In addition, we can also produce coils that are perfect for accommodating the rigors of higher temperature applications such as preheating, drying, heat treatment, heat recovery and/or removal.

  • Applications include booster heat, reheat, and waste heat reclamation, pre-heat, fluid process heat & more.
  • All sizes, shapes, capacities, circuit patterns, fin/tube configurations.
  • Duplication of obsolete designs; custom design for new application.
  • We match existing dimensions and performance criteria for coils presently in use.




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