What is the difference between a forced air heating unit and a hydronic heating system. A forced air system has a burner compartment supplied by either natural or propane gas, transferring the heating through a heat exchanger with a flue vent. The warm air is forced through supply ducts by a blower distributing it out at a register or diffusers.
A hydro heat system uses a natural hot heater to provide space heating as well as domestic hot water in household usage.
Hydro heat is a very efficient form of heating. This type of system is similar to a forced air system, the difference is the burner in the furnace is replaced with a finned tube heat exchanger ( its look similar to a car radiator ). A simple loop circulates hot water through the heater exchanger in an air handler furnishing warmed air to the space.
Unlike a furnace, hydro heat air handler do not require a natural gas connection or a flue vent because it receives its heat from the water heater. Most of this units also include a circulating pump and controls.
One of the common problems with type of units it intermitted leaks and corrosion at the joints.