"A boiler can be used to turn a liquid into vapour. A boiler can contain one or more vessel for the separation of vapour and liquid. Where the liquid is water, such a vessel is called a 'steam drum'." . "Qualified" . "BOILER" . "BOILER" . "RDS14058190" . "A 'fluid treatment device' that is intended to heat a liquid." . "u20683" . "2005.12.15" . .