Arrived and drained existing 40 gal gas water heater. Pulled from closet and reworked water lines. Installed new ball valve, hammer arrestors, supply lines, and expansion tank. Set new heater and hooked up water. Turned on and bled air from lines inside home. Hooked up gas with sediment trap and new supply line. Lit water heater and informed customer they should have hot water in roughly 45-60 minutes.