Editor's Note: "Back to Basics" is a column that will run periodically in PME reviewing the basic principles of plumbing engineering.
As frequent business travelers know, there can be many frustrations to being on the road, including cancelled flights, long lines for rental cars, and indigestion from constantly being on the run, attending meeting after meeting. There is nothing more frustrating than jumping into the shower for a much-needed morning wake-up, only to discover that the water is ice cold--no hot water to be had anywhere!