Zalman ZM-GWB1 VGA Water Block for Reserator 1 System The Zalman Reserator 1 is designed with an optimal heat dissipation area based on ZalmanTech's HCET (High Capacity Extrusion Technique) and high efficiency cooling technology. As a result, this product achieves excellent cooling performance even with natural convection, making it the world's first fanless, noiseless water-cooling system.