Originally Posted by Pennglock
2. Hot water heaters in those days didnt use a pump. Ive seen shots of turn-of-the-century houses where the water heater was in the attic and operated by gravity. This would produce much less pressure than the main water line, so a convenient way to get around balancing that pressure to get enough hot water is 2 faucets.
Any plumbers on board have a real explanation?
I am an amateur plumber but I believe this explanation is accurate. Many times in ye oldern days the cold and the hot water had different pressure. It stuck around because that's what many people's old sinks had installed so you couldn't replace just the faucet you would have to replace the whole sink.
Also we had one of these in the house I lived in during elementary school.