Here’s the wiring diagram for the HERMS. It’s actually pretty simple. I got a heavy duty outdoor extension cord cut in half, with a length removed to use as extra wire. We go from the outlet to the Love TS controller, which measures the temperature of the wort as it reenters the mash-tun. When that is fired, it powers the Love TCS controller, which has a thermocouple going up to the pilot light. If the temp is 350 degrees or warmer (arbitrary temp that indicates there’s a flame), the TCS fires the ASCO solenoid (on the other end of the extension cord), which then lights the main burner.
The short jumpers between 8&10 and 9&10 can be tricky to get two wires into a single terminal, but it saves from having to do another splice. To me, that just complicates the whole works and creates a point of failure. I say this because this isn’t the first time I wired it. 
At the splices, I used a copper crimp and taped it up. With the neutral wires, there are four coming together, and using a simple twist thingy is pretty tough.
Here, we see the HERMS heating the mash from a protein rest, and is currently at 133. The top controller is the pilot controller, and it’s currently reading 409 degrees. That means there’s a pilot flame, and we’re good to go!
UPDATE: 03/06/08 - It looks like there is a new wiring layout for the Love TS controller. Here’s a post with the updated wiring.
And the disclaimer… I’m just a dude on the Interweb, so if you don’t know what you’re doing, find someone who does. I so far have managed to not kill or seriously injure myself with this information, but that doesn’t guarantee you will find similar mileage.
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That I don't know. I've called them before and they were very helpful. That's probably your best option. I know it's metal, and metal probes seem to be waterproof. If you need to use a thermowell, a simple sealed corny dip tube should get the job done. Crimp it shut and fold over with pliers, and then use some food-grade silicone sealer. Good Luck!
On this post, I've got a shot of my HERMS return. I'll do a full out post on this part when I get the time. This is kind of a key point of my system. It's basically a T-fitting with a 1/2-inch thermowell.