If my grandparents' house was any indication, households that had a wringer washer didn't have separate hot and cold water connections. (Grandma's double laundry tubs a single faucet. It was similar to most kitchen faucets, except that it was stationary. You could adjust the hot and cold water as desired, but you couldn't move the faucet from side of the sink to the other. The hose that was used to fill the wringer was used to direct water to each tub. If my practical grandmother had gotten an automatic washer (she used a wringer until the day she died), she would not have hired a plumber to install the hot and cold water connections. She just would have connected one hose to the faucet and adjusted the temperature as needed. That's exactly what my mother did when we lived in an apartment. A single hose was connected to the faucet in our kitchen sink via a connector was that was similar to the ones used for a portable washer.(My parents paid for a full size Maytag that had a water temperature control. It was set to "warm" until the day it was sent to the crusher.) This type of machine would have been perfect for them.
Mike