How many gallons of water are required? What is the weight?

A King size hardside waterbed mattress requires only about 235 gallons of water, a Queen size waterbed mattress about 196 gallons. A King size can weigh up to 2000. pounds. All floors built to minimum building codes will support the weight of a waterbed. The softside waterbeds can weigh up to 1/4 th that of a hardside style.