Thanks for the kudos on the smoker, guys, I'm loving it! I did another Butt this weekend and the crowd was quite pleased.
To answer your question, NWBBQ, the hotplate I bought from Sears has a knob to control the heat output. I've found that for the cold weather we've been having lately, if I keep it at almost max temperature, it maintains something close to 225 degrees in the smoker - just about ideal. On a sunny and warm afternoon when I was still testing it, a setting of roughly medium-high produced a higher temperature, about 245 degrees, but there was no meat or wood in the smoker, which I'm sure affects the temp. The one thing that's a drag about this smoker is the difficulty in adjusting the temp. Thankfully, once you get to know your hotplate, and predict your conditions, you can set it before the cook, and forget it, since the ceramic helps to keep the heat pretty consistent.
This weekend, I started a 4lb boneless Butt at about 11pm on a cold, windy, and rainy night - a real shocker here in Seattle

The smoker's temp was about 220 degrees when the Butt went in before I went to bed, with plenty of smoke coming out. I checked the smoker's thermometer from my bedroom window a few times with binoculars during the night (I must have looked like a pervert), and it didn't drop below 200 degrees. When I checked the probe thermometer temp in the meat at about 8am, it read 165 degrees, and the smoker temp was 210 degrees on a chilly morning. By 11 am, the Butt was done, and moist as can be!

Thanks again, Stogie.
Regarding propane, Ronald, that's an intriguing idea, as you might be able to control the heat output from outside the cooker, depending on the stove. For long/slow cooks, though, I'd be concerned about running out of gas in the middle of the night. Also, regarding rusting, the burner that I bought from Sears (a Rival, I believe) was only 12 bucks. Even if it only lasts a few months, that's easy enough to replace.
I think I'll take some pics of my smoker, gather all the purchase details, and start a new thread like Ronald suggested. Now, it's time to plan how I'm going to smoke some Babyback Ribs!