Energy/BTU meters are a key tool for reducing & optimizing energy usage and reducing greenhouse gas emissions. These instruments, which are typically used for sub-metering applications in large residential or institutional buildings,  provide a number of benefits to their users including lowering utility costs, the ability to capture energy usage that is not recorded by residential electrical meters, and increased property value. Ultrasonic BTU/Energy meters combine all of these benefits with the additional advantages provided by the non-invasive ultrasonic flow measurement technique.