Hydro-Therm Heating Systems:
A hydro-therm heating system is simply a combination of a forced hot water system with a forced hot air heating system. The way it's set up is, the boiler heats the water and sends it through pipes. These pipes carry the heated water through the inside of the air duct for a forced air system. The benefit of this type of system is that usually there is no need to install a humidifier on the system. A humidifier isn't needed because the warm air that's circulated isn't as dry as the air from a typical forced hot air heating system.