Installed new 50 gallon 6 year gas water heater in the garage. Modified all water, gas, exhaust, and relief lines to accomodate the new water heater. Unit was installed in a code required drip pan. Installed and mounted new thermal expansion tank to the structure. Expansion tank set to 70 psi and water temp set to 120°F per manufacturer instructions. Tested system for leaks and proper function and hauled away old equipment for disposal.