How much electricity does a water bed heater use?

A water bed heater typically uses between 100 to 400 watts, depending on the model and settings. If left on continuously, this can translate to approximately 1 to 6 kilowatt-hours (kWh) per day. However, actual usage may vary based on the heater's efficiency and the ambient temperature of the room. Keeping the heater on a lower setting or using it only as needed can help reduce electricity consumption.