The Sundance 6500-057 heater assembly can be found in Suntub hot tub models from 1994 to1996.
The Sundance Spas 6500-057 flo-thru heater assembly has the following features and specifications.
Manifold Length: 12"
Manifold Diameter: 2"
Stainless Steel: Yes
Heating Element Included: Yes
Kilowatt Rating: 4.0KW / 1.0KW
Voltage Rating: 240V / 120V
Clip for Sensor: Yes
Temperature Sensor Included: No
Hi-Limit Sensor Included: No
Pressure Switch Included (A.K.A. Flow Switch): No
Number of Threaded Taps: 1
Threaded Tap Location(s): Pressure switch tap 3 O'Clock.
Tail Pieces Included: Yes (removable)
Tail Piece Size: 2" x 2" (removable)