The system is used for thermal vacuum dehydration and degasification of electrical insulating and lubricating oils in order to withdraw free and soluble water, gas and to remove particulates. UVM can provide the systems with flow rate between 0.16 m3/hr and 8.0 m3/hr. An explosion proof design of the systems is possible for working in an environment with potential risk of explosion. Full automated operation of the systems can be accommodated. Each system can be mounted on castors or a trailer.