These pumps allow for the collection of condensed liquid within a steam system to be returned to the boiler room by either the use of electricity or steam. Motor driven pumps contain centrifugal designed pumps which include controls which can de-activate the pump upon low water levels in the receiver.  Motor driven units contain 3/16th thick, welded steel or a cast iron receiver with an electric motor that is similar to a bronze fitted, centrifugal pump. Simplex and duplex designs are available which come with or without mounted, pre-wired control panels.  Steam driven units are generally used in areas where electricity is non- existent or in hazardous type areas.