Looks OK, does very little
It's a good idea, in principle, and practical; however I've researched room humidification, and the amount of water evaporated from these canisters-- I bought 4, one of them was rusted, dented, and leaked, and I had to supply photographs to prove-- against all but the hottest radiator is minimal. And when the room is hottest and when humidification is essential for more than respiratory requirements, i.e. for the preservation of wood furniture, musical instruments, etc., the only effective method is with an electric humidifier. My humidifier is kicking out pints of water every day to keep the room in a monitored 50-70 hygrometer thermal range; while the canisters are losing an inch at most of water every few days. A very good well designed electric humidifier runs about £40.
Verified purchase: YesCondition: New