The Tekmarnet® 4 Setpoint Control 162 is Designed to Operate a Single Piece of Heating or Cooling Equipment in Order to Maintain a Setpoint Temperature. It Can be Used in Applications, Including Heating a Swimming Pool, Maintaining a Chilled Water Storage Tank, And Maintaining a Constant Slab Temperature in a Commercial Car Wash Bay. This Product Regulates a Constant Water Temperature For Heating or Cooling Using One of 6 Preset Modes (Setpoint On/Off, Hot Tub, Dhw, Setpoint Pwm, Floor, Pool). It Has 2 Relays (Rated at 24 V, 2 A) And Uses Relay #1 to Control The Heating/Cooling Device, While Relay #2 Can be Used For Devices Such as a Dhw Re-Circulation Pump. For Further Information And up to Date Literature Visit: Tekmar Documentation | Tekmar Controls | 162