Duct Heater aplication

[newmep]

Hi,
What are some common situations when a duct heater is used and why. Doesn't the supply air provide required heating?
Thanks,

 

[imok2]

You may have a situation where a room is a long distance from the source of heat and is always cold. To mediate the problem you would consider installing an electric duct heater with its own thermostat.

 

[MintJulep]

When you have cold air in a duct and want warm air in a space.

 

[newmep]

Thank you and merry christmass.

 

[trashcanman]

It depends on where the thermostat is for the main air handler. The space could have higher heat loss/sq.ft. than other spaces (corner room, lots of glass, poor insulation, etc.) If the other spaces controlled by the main thermostat are satisfied and the problem space is still cold ==> Duct Heater required.

 

[walkes]

It may just be for zone control. Using electric duct heaters in lieu of hydronic reheat coils where the electric system may be appropriate.