Yes because at 100C you can use phase change to transport water, which means you've built a primitive heat pipe. At 95C H transport is slow so heat will accumu

Yes because at 100C you can use phase change to transport water, which means you've built a primitive heat pipe. At 95C H transport is slow so heat will accumulate until it reaches 100. But then you have boiling and, w/out good seals water loss.