Okay I get it now. If your pipes are cold, the hot water wait time is not set by the time is takes for hot water to flow from the heater to the shower. The first hot water to reach the shower is not hot anymore because the thermal energy is used up heating up the pipes. So not until the pipes warm up is the water at the shower actually hot. This process is quickened by increasing the initial temperature of the water.
Interesting, I may need to increase my temperature a little more. I have it at 125 right now.
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