IIRC, the large Miele series also had a gas dryer option. I believe the washer ran on 110V, so one could operate the washer and gas dryer with just a 110V outlet and a gas pipe. This was a selling point, since with most Miele and Bosch one needed a 220V plug. The 4800 series featured US-style hot and cold fill valves, which would have allowed use of an integral heater at only 110V, since most of the heat would come via the hot water in the hot water pipe.
Where I live, the city in the mid-1990s banned the installation of 220V outlets in laundry areas of newly-built homes, to conserve generating capacity and to force people to use more abundant--and cheaper--natural gas; I don't know if they still have the restriction, since solar panels have changed the game. One could of course install a 220 after purchasing the house, but the company that built the houses could not install one as part of the original design. My home was built a few years before the "220 ban" and does have a 220v plug in the laundry area, though I've always owned gas dryers and the 220V plug has never been used. There is no 220V in the kitchen, because a gas range was part of the original design when new and the architect likely assumed the owner would simply upgrade to a better gas range when ready, which is what I eventually did: a free standing gas convection range. There was also a capped-off outside 220V outlet for an air conditioner (outside condenser unit), which went unused until two years ago, when I finally installed central A/C.
