Plate cooler is a compact and light-weight oil-water cooler with high cooling capacity despite its small dimensions. It consists of corrugated channel plates enclosed by a back and front cover plate. The channel plates are pressed and vacuum-welded in an automatic procedure subject to very strict quality controls. The unique plate design provides highly turbulent flow conditions throughout the cooler, the key to efficient cooling. Turbulences prevent deposits from forming to such an extent, that the plate cooler is virtually maintenance free.