BTU Meter for Solar Water Heating Applications receives flow data from the field mounted flow meter, along with signal from two PT 100 sensors mounted one on the supply line and the other on the return line. BTU Meter is a thermal energy measuring equipment for solar water heating applications. BTU Meter has an isolated RS 485 communication link with MODBUS protocol and the data from this unit can be collected by data concentrator or PC user interface. BTU Meter for Solar Water Heating Applications can be availed in different specifications to cater to specific requirement.