The Therm Products C2550-0021 heater assembly can be found in Cal Spas hot tub systems (but not all) made between the years of 1990 through 1992.
The Therm Products C2550-0021 flo-thru heater assembly has the following features and specifications.
Series: Swadged (but not limited to, unless specified otherwise above).
Manifold Length: 15.75"
Manifold Diameter: 1.5"
Stainless Steel: Yes
Heating Element Included: Yes
Kilowatt Rating: 5.5KW / 1.375KW
Voltage Rating: 240V / 120V
Mounting Studs: Yes
Number of Mounting Studs: 3
Clip for Sensor: Yes
Temperature Sensor Included: No
Hi-Limit Sensor Included: No
Tail Pieces Included: Yes (removable)
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