The heater is 12 watts, which I was assuming was enough since it gets hot! Many reptiles like it really hot, which is why I was thinking it would be enough to maintain the temperature. I wasn't planning to use it to heat up the bath, just to maintain its temp. It has no built-in temp regulation. Just plug it into the wall. Which is why I mentioned using the dimmer switch.
Thanks for the heads-up on the FAQ. I wasn't aware of blix's inherent short shelf life. I guess the next time I order a set of chemicals, I'll think about one that has a separate bleach and fixer. If I can find one. The selection is getting mighty thin on the ground anymore these days.