You are, of course, aware, that changing anything from the equipment provided and specified by the manufacturer voids the warrantee. The manufacturer hopes even the most idiotic judges will understand that the factory did not approve substitutions; so the responsibility of altering the design and any ensuing accidents are solely the responsibility of the repair company that takes on the roll of the dice. Surely any unwitting fixit can make the water heater achieve scalding temperatures. How to prevent EVERYONE from scalding themselves while getting barely hot water is the new trick of the millenium. Don’t J-walk.