A hydro air system is a combination of a hot water and a hot air system. A hot water boiler, either oil or gas fired, generates heat. The water is then pumped through small diameter tubing to an air handler unit. This unit contains a hot water coil, an air conditioning coil, and a fan (blower) unit. This unit resembles an air conditioning air handler. As hot water heats up the coils, the blower then passes air over the coils. This air is then distributed throughout the home via a duct system. The same ductwork is also used to distribute cool air if an air conditioning unit is also attached.
This design concept has several advantages over straight hot air heating. The most prominent advantages are: 1) ease of zoning; 2) the proper sizing of zones; 3) increased comfort levels over straight hot air systems; and 4) the ability to easily expand the system and generate heat in other ways that a traditional hot water system cannot.All the advantages of hydro air would be difficult or impossible with a straight hot air system. Zoning is much easier because a flue pipe or exhaust is not needed for each unit, as with separate furnaces.
Hydro air is an excellent choice for use in conjunction with other systems. It is a cost-effective alternative to a complete hydronic (wet) system with separate air conditioning ducting, giving the homeowner great versatility at moderate cost, with the appealing, added ability for central air conditioning.
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