I use a SWK Scuttle everyday and love it, the first pass the lather/brush is really not that warm but pass 2/3 is great, as far as using on just full the outside/inside with pretty hot water then you can soak your brush and safety razor while you shower then just dump all the water and refill the outside with hot water and buid you lather in the bowl or use it to keep the latherd brush warm.

Here's mine that my son gifted me:

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