Profile: ACT, Inc., D'Mand Systems offers hot water distribution system. Our brands include Metlund D'Mand Systems™. Our Metlund® Hot Water D'MAND® system consists of an electronically controlled pump and valve assembly that allows for the rapid delivery of hot water to plumbing fixtures, without loss of cold water down the drain. Our D'MAND® system is activated when someone creates a demand for hot water by activating the pump with any one of a number of methods. The Metlund® hot water D'MAND® system delivers hot water without wasting cold water down the drain. Our manifold block hot water systems are designed to have the hot water enter a block near the water heater. The block, similar to a small holding tank, has many small lines going in various directions to each hot water fixture in the home. For example, bathroom sinks and showers would be on their own hot water line from the water heater.