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Quote: LOL! They don't get that hot, and heat slowly. I have slate tiles on the radiators and they are fine after years of hot-cold cycles. I was going to use a round river rock, but we do have some big lava rock chunks around. What kind of rock was it?

We use big, 55-60 gallon food storage drums. They hold about 300 pounds feed. We also use them as rain barrels. For water this year I am trying the hot rock in the steel waterer. We have radiators, so my plan is to heat a rock on one, pop it in with the water, and see how long it takes to...