I have a crowded 2 car garage and the main wall is where my washer, dryer, hot water tank, and A/C unit are. I am trying to figure out a way to hide or disguise them. Maybe even just dress them up a little!
There are many newer model homes with washer and dryer cabinets built in. If you properly vent the dryer you will have no problem there. The water heater and A/c are another matter as your particular units will need sufficient space to breathe properly ie.. You would have to check with the manufacturer or a plumber to allow for sufficient space. That being said, my water heater and house heater are in a closet in the hallway. There is about 12" of space between them and they are about 6" from any wall. Find out what you require and build a cabinet around them as well.
They also have blankets that go over water heaters to make them more efficient, however that would not hide the pipes at all.
