Sears.com says installation is not available for this item, only delivery is available: sears.com/ge-appliances-ge40t08bam-ge-water-heat-40-galll/p-A088743812?redirectType=SKIP_LEVEL
The reason being that many states now require a plumber to install a water heater. You can get it delivered to your home, then find a local handyman (or plumber if required by codes) to install it.
In my area, codes require plumbers to install water heaters now. It should be cheaper to order the water heater on your own from Sears and get someone to install it, than to order it from somewhere that finds plumber to install and buy it for you. Places that do that charge a mark-up on installation from a third-party. (I hope that makes sense.)
Installation is available on all other appliances from Sears.