Systems and methods for continually measuring and calculating performance of a hot water or a system are described. A central monitor receives and processes information from hot water or steam field devices. A mobile device can communicate with the central monitor and display processed data from the central monitor regarding field devices associated with the mobile device. The central monitor can determine and send control parameters, maintenance reminders and other information to the mobile device or to a monitor at an enterprise location. Data is sent to the mobile device from the central monitor when there is a quality communication connection. If the mobile device is in the field with a poor or no communication connection, it stores updates and pushes the changes to the control monitor when a quality communication connection is reestablished.