I just use a. Old pot of Water putting it on top of wood stove next to the mostly aesthetic but cool functional heat powered fan. Went from 10% humidity in my cabin to a more comfortable 40% just have to remember to fill the old pot and the larger pot you use the more moisture it puts out.
Works pretty well on any stove without a convection top, but many modern stoves won’t allow it due to convection tops running too cool. I can actually sit my hand on top of my stoves when they’re running with the blowers.
The amount of humidity you need to generate, and the ability to get it done solely with a pot on the stove, is going to depend on size of the house and where you’re drawing your make-up air. Those with an outside air kit (OAK) on their stove will have better success with this than those drawing make-up air from the house, which must be replaced with outside air.
Most over at hearth.com who’ve tried this on their radiant (non-convective) stoves over the years report that the pot on the stove rarely generates as much humidity as they need, but these are also likely folks not running OAKs on their stoves, or with larger spaces requiring more heat and thus more total air volume up the flue.
We run 3 humidifiers, which consume roughly 30 gallons of water per week trying to hold near RH = 50%, but I’m running two large stoves without OAKs in a very large and inefficient house. I could make the pot on stove trick work if I removed the convection decks from my stoves, but I think I’d still have trouble evaporating that volume of water from two or four pots of water.
We have to pull humidity out of the air. Dehumidifier runs frequently just to keep it down to 50% indoors. A little less in 'winter'.
It’s a problem unique to heating climates, especially those running combustion sources (oil or coal furnaces and boilers, or wood stoves) from air taken out of the home. The combustion plant draws air from the house, so the house has to draw new cold air in from outside. But then you have to heat that outside air, which drives its relative humidity toward zero.
Our house runs 17% - 19% without humidifiers running 24/7 during heating season, and it’s supposedly a “damp old mud-stacked stone” house.

My barn and music studio both hold closer to 30%, as their heat pump heating sources don’t draw combustion make-up air from the heated envelope.
Winters in my experience it's the opposite. The cold winter air is dry.
