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My experience is a little different. I've had the same feeling about the hot lather at the barbers. It didn't take 30 seconds at all to cool down, it was almost instant.

However, I do find that...

My method:

Before starting a shower, I take the mug and fill it with hot water and put the ramikin (smaller bowl-type object in the picture) into the mug ( thin O-ring is just there to provide a...

Scuttle - works great. You can either by an older one or a Moss scuttle or do what I did, make you own.