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One trick to keep the water a bit hotter before it reaches the shower head is to spray expanding insulation foam into the wall behind the shower through a tine hole. Will keep the water in the pipe, concealed by the wall, much warmer. Made a noticeable difference in my un-insulated interior wall behind the shower. Only wish I had thought of the idea sooner. Now I may also try insulating the pipe from the wall to the shower head.
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