Not the prettiest installation but pretty good for me.
The only real challenge was trying to sweat the Ts into the feed and hot water line. Water kept seeping back and I could not get the joint hot enough. Mari Lin at Pettit's Hardware suggested that I consider SharkBite fittings (Part number U370LF) and they worked like a champ. A HUGE shout-out to Mari Lin.
I opted for a couple, 1/4 valves on each line so I can replace the water heater without dropping water pressure next time.
One thing that was baffling to me is that the box advised 40 Amp service. I used 10 gauge copper and the existing 30 Amp breaker. I suspect that the manufacturer based that advisement on the home-owner replacing the smaller heating element with the most powerful one that will fit into the hole.
So far the 30 amp breaker has been "holding" just fine.
Appliances replaced in the last six months include the water softener (only recharged with salt once in six months), dishwasher and water heater.
I am ready for a break. So is my budget.