Sorry, poorly worded.

The one setup doesn't really "loose" the cold, it just uses an electrical pump to pump from the hot side into the cold. When you use water the system shuts down, but the cold side will have a lot of residual hot, so it will never be that cold, I would think.

This setup also requires electricity under the sink, which I don't have there.

Her sink is on an outer wall, all the plumbing is in the crawl and well insulated.
It is the farthest from the water heater so it takes a while in the morning, especially on these cold Chicago nights.

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1990 500SL

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