I wonder if there is a way to better insulate the pipes so they don't lose their heat so much. That's pretty unusual. Five minutes is a long time for water to

I wonder if there is a way to better insulate the pipes so they don't lose their heat so much. That's pretty unusual. Five minutes is a long time for water to run down a pipe- you must be running 75ft or so of pipe- so insulation is the other answer (the first being the on-demand water heater in the shower- I used one once and had no problem with it, and it may be more efficient anyway).