Pride Plumbing came out and installed a new customer-supplied A.O. Smith Signature 100 commercial gas water heater. This required us to install the new water heater, bore a hole in the wall and run a new black iron gas supply line from outside to inside the building and add a gas regulator; install new water and gas ball shut-off valves, water and electrical connectors, a brass drain valve, an atmospheric vent, and thermal expansion tank; ensure that the unit was properly vented; and once the gas line passed its pressure test and was approved by the gas company, light its pilot, set it to its appropriate operating temperature, and check for leaks and proper operation.