The CL-100 and TC-202A are both bipolar temperature controllers, but they are targeted towards different product lines. 

The CL-100 can control all Warner bipolar (Peltier driven) devices.  It can also provide temperature control for the SH-828 eight line solution heater in which 8 separate lines are heated to the same temperature.  These devices require fairly fast responses which the CL-100 provides.  

The TC-202A provides heating/cooling for all Medical Systems Peltier driven products. This device is not compatible with Warner products.