Water mattress or a waterbed water bed is a bed or mattress filled with water. Water beds for medical use are reported several times in the nineteenth century. The modern version was invented in San Francisco in 1967 and patented in 1971, became extremely popular in the United States in the 1970s, in keeping with the spirit of this hedonistic period.
Pros and cons:
+ Shape fits exactly to the body, which limits the pressure, especially at the joints. They limit the pressure on the spine, allowing muscles to relax completely posture. This can be useful in the treatment of some pain. In paralytic or handicapped, they can reduce the risk of bedsores.
+ Grime and dead skin particles cannot penetrate into the mattress, less risk of allergies.
- Their heating is expensive, but less than a blanket. A waterbed consumes between 300 and 1500 kW-h/an, depending on climate, bed size and other factors. This consumption can be 60% lower for soft-side models
- Move a waterbed is more difficult than traditional bed: it must be drained of water and the frame disassembled. After reassembling and filling the water must be heated for several hours (or days) for it to resume the correct temperature.
- Sometimes there are leaks. Plastic envelopes reduce the damage, but it must be emptied, repair, fill and warm the bed.
- the weight of water beds can strain the floor (bed 160 x 200 x 20 cm weighs 640 kg)
Water beds are equipped with multiple layers of fibers, or synthetic foam for maximum stabilization.