The Universal Reset Control 374 is Designed to Operate All of The Mechanical Equipment in a Residential Hydronic Heating System. It Can be Used in Applications Ranging From a Single Zone of Baseboard With an On/Off Boiler to Multiple Fan Coils, Low Temperature Staple up Zones, Low Temperature In-Slab Radiant Zones, Domestic Hot Water, And 2 On/Off Boilers. It Regulates up to Three Space Heating Water Temperatures Through Outdoor Temperature Reset. It is Capable of Controlling up to 2 On/Off Boilers, up to 2 Mixing Devices (Either Variable Speed Pumps or Floating Action Mixing Valves), And Domestic Hot Water or Setpoint Loads. For Further Information And up to Date Literature Visit: Tekmar Documentation | Tekmar Controls | 374