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What does it cost to heat a 4D-Comfort water mattress?

cost of heating a waterbedA softside waterbed is a well-insulated system because of its foam borders, its cover and its closed plinth. 4D-Comfort mattresses usually have an additional insulation pad, called Isopad.  The power used, is about 1 kWh/h per day, the average of a tiny light bulb. The exact quantity is determined by the size of the bed, the bedroom temperature, the insulation value of the quilt etc.