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I don't put the scuttle in the microwave, I should have been clear about that. I fill it first with hot tap water, while water is heating up in the microwave. While that's going on, I'm doing a hot...

I've found that the scuttles that hold 4 cups of water really keep the lather warm/hot.
4 cups of water in the microwave for 3 mins is about right, ymmv.

I had similar heat loss problems with...

It's nice to see Georgetown Pottery made a scuttle that holds enough water for it to stay hot long enough to shave. I have an older model that did not stay hot. I tested them with a digital...