Took me just under two hours and only had one minor issue. I was able to salvage the cold water connection, so it was a pretty smooth swap all together. First order of business was heating the house up to 75 as I had to shut off the gas to the furnace since the closest valve was inline above the water heater and furnace. I gathered up all the tools and parts. I ended up adding a second crescent wrench and it took some PB Blaster to get fittings loose.
After I turned off the gas and water, I drained the tank in to the shower, which really took longer than anything else. Once it was drained, I disconnected the hot water outlet, cold water inlet and the gas connection. Once the tank was empty and disconnected, it was time to make space for the new, bigger 50 gallon tank.
Thankfully I swiped an appliance dolly from my former employer because that tank was a beast! Once I slid the new tank in place, I checked the gas/water line situation and was pleased to see the cold water inlet would work, and that I could eliminate some of the old, steel gas line. I connected the cold water, cut the hot water off and connected the Sharkbite fitting, then turn on the water after opening the hot water on the faucet furthest from the tank. While the tank filled, I connected the gas and the vent pipe. Once water was flowing from the upstairs faucet, I turned the gas back one and checked for leaks. After I fired the furnace back up, I lit the pilot light. Once it was lit, it was time for the FUBAR since it went so well! While putting the cover back on, my hand slipped down the cover and slice the ever living hell out of my finger. Lost a bunch of blood, but I didn't lose water or gas, so all is good!!!
Next step down in the laundry room is to hook up my wash sink so I have a place to clean/butcher animals. Going to repaint the floor from where the constant popping of the PRV on the last tank ruined it too. Be nice to have a good usable space down here!