Then there's the servants' privy I've seen used in contemporaneous documents regarding the outdoor variety, even after the introduction of the flush toilet not just the pit. Also water closet - a politer term, and indoors too.
Reading of others' experiences of retrofitted bathrooms is quite interesting, and echoed by my various experiences. For years I lived in 1920s house complete with 1920s plumbing including a cream enamel gas water heater (very luxurious for its time) that had so many pipes it looked like something designed by Heath Robinson. The subsequent 1950s kitchen renovations have failed but the 1920s water heater is still going strong, 'plumbing ostentation' pipes'n'all.