honestly, I didn't know how to answer, I use a Cambro only for holding, if I am not careful, I can get food to continue cooking in a cambro, I wouldn't add any heat to the device at all.
trust me, you will never have a problem of holding heat, ever. (disclaimer,,, I only held meat, longest, 8 hours, still pipping hot!)
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UDS (Snail barrel)
Traeger 124 (older american made model)
WSM, one touch kettle
gasser from costco,