Putting an open container of water on a heat source will help increase the humidity in your room but not as quickly as a humidifier would.

You can increase the rate of evaporation by using a shallow bowl or tray rather than a glass to maximize the surface area. You could also use multiple bowls at the same time.

Please make sure you use bowls that are designed to be heated as others may break, creating dangerously sharp fragments. This risk is greatly increased if your heater operates at a high temperature which tends to be the case for older, smaller models.
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