.DisHeatLib.Substations.BaseClasses.Bypass .DisHeatLib.Substations.BaseClasses.BypassThis is a model for a generic by-pass that can be used, e.g., in a district heating substation. By-passes are used to avoid waiting times in heat supply and to avoid freezing of return lines in the district heating network. However, their use increases the return temperature and, thus, the losses of the network. The by-pass can be controlled by a thermostat or it can allow a constant flow.