It is a simple switch Belize. Do you even know how they work? More importantly, when they work? Here are a few quick comments from an internet search:
Here's how it may work in your house. Suppose a bare wire inside an appliance touches the metal case. The case is then charged with electricity. If you touch the appliance with one hand while the other hand is touching a grounded metal object, like a water faucet, you will receive a shock. If the appliance is plugged into an outlet protected by a GFCI, the power will be shut off before a fatal shock would occur.
A ground fault circuit interrupter is an inexpensive electrical device ....
Inside the GFI are two sensing coils which measure the current going out of the black wire and coming back through the white wire. If some of that current going out through the black wire doesn't come back through the white wire the circuit inside the GFI box senses that you are about to get fried (via the unbalance of the outgoing and returning current) and shuts the circuit off within about 10 milliseconds! You might just begin to feel a tingle if you are very sensitive to electricity, but it will not persist long enough to do any harm!! ....
A lot of manufacturers switched to plastic cases to avoid a ground fault. Most likley the WDRP heater will also be in a plastic housing. So yes, with the onboard controller, it is a simple switch with even simplier programming.