First generation waterbeds had only one water chamber, hence they needed some time to stabilize it when you climb on to it. A partner already lying in bed will move significantly and wake up. Second generation had the water in chambers that are interconnected. That reduces the amount and speed of water when moving. Third generation waterbeds have a mixture of air and water chambers, usually interconnected. A typical heating pad consumes 150-400 Watts of power and uses a thermostat. Depending on insulation, temparature, use and other things, electricity usage may vary significantly. Please be aware, that the annual electricity cost may be USD 100-500. My waterbed has used a daily average of 3.7kWh in February in Hong Kong.

Waterbeds are usually constructed from rubber or similar material. They can be repaired with a bicycle repair kit or a dinghy repair kit.

Dr. William Hooper of Portsmouth, England, patented a waterbed in 1883. He devised it to relieve bed sore pains in his patients. Unable to contain the water and control its temperature, his invention was a market failure.

The modern waterbed was created by Charles Hall in 1968, while he was design student at San Francisco State University in California. Hall originally wanted to make an innovative chair. His first prototype was a vinyl bag with 300 pounds of cornstarch, but the result was uncomfortable. He next attempted to fill it with Jell-O, but this too was a failure. Ultimately, he abandoned working on a chair, and settled on perfecting a bed. He succeeded. His timing could not have been more perfect: the Sexual Revolution was under way, and Hall's waterbed became enormously popular, making it one of the most notable icons of the 1970s. However, because a waterbed is described in the novel Stranger in a Strange Land by Robert A. Heinlein, Hall was unable to obtain a patent on his creation.

Advantages of waterbeds:

• always heated, which is very comfortable in the winter time. As the body lowers the blood pressure in warmer environments, you are likely to fall asleep easier.
• excellent sleeping comfort, as the bed shapes exactly like the body. Pressure to the body is so minimized, especially around joints

• always requires heating, which is a high cost, especially in winter
• quality of sexual intercourse is reduced, as the energy of movement is absorbed by the water, instead of the partners clitoris