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” or “booster” coil.
Materials: 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.
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.