I too had problems trying to heat a Sterilite tub with a reptile heat pad. I ended up getting a 45 gallon Rubbermaid Roughneck tote and the heating pad heats it np. Its a 30-40 gallon Zoo Med one that I use a lamp dimmer from Home Depot and turn it down to lowest setting and I get around 100 degrees on the floor of the bin. Can use a smaller one but I had the big heat pad laying around. Weird thing is the feeder bin is the 18 gallon Sterilite now and I have it sitting on top of my boa cage which has a solid top and uses a Pro-Product radiant heat panel and that seems to heat the bottom of the bin to mid 80s np. Anyways, you could use a CHE to heat the roach bin. I tried it with a 250 watt CHE I had laying around with a 300 watt max lamp dimmer and it mad the CHE hum like crazy so I quit that. Might work better with the 150 watt since you aren't trying to restrict so much of the power. At the moment for my breeder bin, like I said, I use the 45 gallon Rubbermaid roughneck tote with a strip of packing tape around the bin 1-2 from the top cause the little ones can climb the sides of that bin. Then I use 30-40 gallon Zoo med reptile heat pad with a Home Depot 300 watt lamp dimmer turned all the way down to lowest setting and then a 25 watt red bulb in a dome on top. that combo heats it fine and I got babies all over the place. The red light doesn't really give off much heat but it does allow me to see inside there without bugging the roaches since I got the top on the bin and have a 24x9 inch rectangular hole cut in the center of the top so I can reach in and give the roaches food and water.