this post was submitted on 15 Jan 2026
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This doesn’t even make sense from a plumbing perspective
that's what I thought at first, but there is actually a way that it makes sense
you have hot water and cold water with a certain amount of pressure behind them feeding your apmt. if you turn the shower to full hot, the valve is still going to mix it with cold water. however if you take the cold water out at the sink prior to the shower feed, it's not going to be replaced by more cold water if the system doesn't have enough supply to keep up with it. so your shower water is being mixed with less cold water than before, resulting in a hotter mixed stream from the shower head
and like maybe there's other things going on and it's not the same in every situation and all that, but you can test this yourself and get this result, so..
I don't know what world you are from but my showers have also gone hot when the toilet is flushed