The Jacuzzi 20138-001 flo-thru heater assembly has the following features and specifications.
Series: J-400 (but not limited to, unless specified otherwise above).
Manifold Length: 15"
Manifold Diameter: 2"
Stainless Steel: Yes
Heating Element Included: Yes
Kilowatt Rating: 5.5KW / 1.375KW
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