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Central Humidifiers for Hot Water Radiator Systems
If you need a way to add moisture to your house without than having to routinely refill and clean a portable humidifier, you should consider installing a central humidifying system. If your heating system uses hot water radiators, a central humidifying system will be independent of the heating system (unlike homes with forced air heating systems). This article discusses systems for homes that have hot water radiator systems.

Central humidifiers work by causing dry air to evaporate a stream of water that has been drawn from the house’s ordinary water system, much like your refrigerator taps into the water system to feed water to its ice maker. A fan in the humidifying unit blows dry air past the incoming water so that it picks up moisture on the way to being released into the house. Usually, the humidifier does not evaporate all of the water that flows into the unit, so some arrangement has to be made to drain away the excess water. Although excess water usage is wasteful, an extra flow of water can be used to carry away mineral deposits and potential mold accumulations, thus helping to keep the humidifier clean.

A central humidifier for a hot water radiator system relies on either finding a central location through from which the house's air naturally circulates because of convection or installing ductwork; otherwise, the unit merely humidifiers one area of the house. The selected location must accommodates both a connection to the incoming water and access to a drain.

As with all humidifying systems, the humidity level is controlled by a humidistat, which turns the humidifier on and off an internal fan according to the humidity in the air.

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