Sigma horizontal and vertical propeller unit heaters feature a wide performance range for both hot water and steam applications. The performance range is consolidated to reduce the number of different models, simplifying the selection, ordering, and installation activities.
All single-phase models may be ordered with a low-cost speed-reducer permitting units to be field tuned. Side entry coil connections on model H units permit installation in clearance-critical low ceiling environments. Special coils, constructed with 0.032” wall Cu-Ni tubes or 0.049” wall copper, are available for more demanding applications. Furthermore, special explosion-proof motors may be ordered for any unit size.