Hydrolevel 48-3000 Hydrostat

24Vac Temperature Limit and Boiler Reset Fuel Smart Hydrostat for Gas Boilers with 100-200 degrees F Adjustable High Limit, Automatic Differential, Adjustable Economy Settings, Wire Harness for transformer type control centers and common Integrated Ignition Boards, and Optional Low Water Cut-Off Operation with addon Electro-Well (not included) (Model Number 3000)