The two models of Johnson Fuel Demand Meters we're currently offering are the F-90 and the F-90H.

    The Johnson F-90 Fuel Demand Meter continuously monitors outside air temperature to provide accurate up to the minute heating degree day totals.   A reliable electronic design allows the F-90 to automatically include weather variables while calculating degree days.  Contemporary compact styling and an easy to read LCD display harmonizes with any office or computer station.  User selectable base temperature is pre-set at 65 degrees Fahrenheit.  The recorder comes complete with set-up instructions, operating instructions, and a one year limited warranty.  Extra cable length for the outside sensing unit and an extended five year limited warranty are also available.  Click HERE for a picture of the F-90 system.

    Specifically designed for fuel use applications, the new F-90H is the most advanced fuel demand meter available.  The HEAT counter utilizes the same rugged electronics and precision outside sensing unit as the Model F-90, while the HOT WATER counter automatically computes degree days plus fuel demand for domestic hot water heating.  Quality components and 100% testing of all Johnson Demand Meters ensures reliable and trouble free operation.  The F-90H is delivered complete with set-up instructions, operating instructions, 25 ft. of connecting cable, and a one year limited warranty.  The user selectable base temperature is pre-set to a standard 65 degrees Fahrenheit.  Extra cable for the outside sensing unit and an extended five year limited warranty are also available.  Click HERE for a picture of the F-90H system.