HOT WATER COIL

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Hot Water Coils, commonly called Booster Coils are typically smaller and made without headers, which saves on manufacturing costs.  Hot Water Coils are a common inventory item that is more likely to be held in stock than other types of coils.  

Hot Water Coils usually have  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.

In a central air system, Hot Water 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 non-heating residential devices.

Sunco Hot Water Coils most commonly have copper tubes.  Most tubes are 1/2" to 5/8” O.D.  However, low capacity coils can be designed with 3/8” tubes. 

Aluminum fins are most commonly used because of  the good heat transfer characteristics and low cost. 

Casings on Hot Water Coils are generally galvanized steel, with stainless options available upon request.  

Lastly, connections are either copper, brass, or steel.