Gas Dryer hookup
A washer/dryer combo requires electrical, plumbing and, possibly, gas hookups.
To install a washer and dryer, you need plumbing knowledge, some electrical know-how and a few carpentry skills. The washing machine needs an electrical outlet, a supply of hot and cold water and a drain. The dryer also needs electricity, but if it's an electric dryer, you must install a 240-volt outlet. A gas dryer, on the other hand, needs piping to supply it with gas. The dryer also needs an exhaust vent.
You may already have a 120-volt electrical outlet near the washer and dryer, and if you do, you should verify that the outlet has ground fault protection. If not, it isn't difficult to retrofit the existing outlet for a GFCI. You may also have to change the breaker to conform to the current specifications of the appliances. An electric dryer requires a 240-volt outlet controlled by a pair of dedicated 30- to 50-amp breakers, depending on the dryer specifications. Unless you're experienced working with electricity, installing a 240-volt dryer circuit is a job best left to an electrician.
The washing machine may be close enough to the water heater for you to tap into its inlet and outlet lines for the cold and hot water supply. If not, then use the nearest 3/4-inch main hot and cold lines. Tie in with 3/4-inch by 1/2-inch tees, and run the lines to the wall behind the washing machine. Each line terminates in a shutoff valve securely attached to the wall framing above the top of the washer for easy access. Plumbers often terminate the supply lines with a washing machine box. It contains the valves and also has an opening for the standpipe.
The drain for a washing machine is called a standpipe, usually constructed with 2-inch ABS pipe. The opening of the standpipe should be higher than the overflow level of the washing machine and a minimum of 34 inches above the ground. It empties into a P-trap which in turn empties into a convenient waste line. It's common for the washing machine to share a drain with a sink or toilet. The P-trap must be vented within 5 feet of the trap. Plumbers often run a vertical pipe from the horizontal trap outlet to a point where they can tie it into an existing vent.
Dryer Gas and Vent
Installing a 1/2-inch galvanized or black iron gas line to a gas dryer is another job for a professional because of the potential for a fire if you make a mistake. Installing the dryer vent, on the other hand, only takes a few carpentry skills. The vent should exit through the side of the house or the roof, so you need to cut a hole for it and seal the gap after installing the vent. Dryer manufacturers recommend smooth metal duct pipe, and the maximum length you can make the vent is included in the dryer specifications, although 25 feet is a standard maximum for a vent with no bends.
What does a gas dryer hookup look like?
I don't know. I'm trying to find out.