The Energy Optimizer Max² is a heat exchanger designed to achieve highly heat recovery efficiency and handle highly contaminated water. It uses a series of rotating disks to maximise the heat exchanging surface and prevent the build-up of deposits from the dirty effluent. The fresh and dirty water is completely separated by stainless steel surfaces. The EOP max² distinguishes itself through its high efficiency tuned at 65-75%, its low maintenance costs and its high flexibility due to the possibility to replace single disks.