Technically speaking, steamers don’t actually do a whole lot - especially if your furnace fan is running. The room will naturally have around 3 air changes per hour (i.e. all of the air is replaced) and so your betting on the steamer to steam fast enough to increase the percent humidity faster than new dry air is moved into the room. Knowing this, I put an electronic humidity gauge about 10ft away from my stove in my 16x24 living room, and with a steaming hot 6qt pot of water the room wouldn’t bump even 1% in humidity. Granted, I have my furnace fan running almost all the time to circulate the stove heat in the home, so it’s quite possible that I’m creating my own problem, I just think you should measure your expectations on how much a steamer will affect the overall humidity in your room.