Watts Tekmar Boiler Control 284

Boiler Control 284

The Boiler Control 284 is engineered to manage up to four boilers efficiently, ensuring precise maintenance of a target water temperature. It effectively operates both condensing and non-condensing boilers, accommodating modulating, single-stage, or two-stage configurations. This provides a versatile and cost-effective solution for mixed boiler plants, enhancing system performance. The target water temperature can be regulated based on outdoor temperature reset or a fixed setpoint for various heating applications, including space and process heating. Additionally, the 284 supports additional loads such as domestic hot water and fixed setpoint heating.


  • Outdoor temperature reset and programmable schedules for optimized operation
  • Compatible with tekmarNet® 4, enabling control of up to four boilers
  • Supports both condensing and non-condensing boiler groups with modulating capabilities
  • Communication via BACnet® or Modbus® for seamless integration with Building Automation Systems (BAS)
  • Primary pump sequencing ensures efficient boiler operation
  • Includes DHW priority and setpoint operation for enhanced functionality
  • Controls combustion air dampers for precise regulation
  • Offers energy, flow, and pressure monitoring for system optimization
  • Equipped with boiler isolation valves for added convenience and safety

Moreover, the addition of tekmarNet® Thermostats or a tN4 Gateway 485 further enhances system performance and enables remote monitoring capabilities, ensuring optimal operation and efficiency.


Agency Approvals CSA C US, meets class B: ICES & FCC Part 15, BTL Listed
Ambient Conditions Indoor use only, 32 to 122 degrees F (0 to 50 degrees C), less than 90 percent RH Non-condensing
Calls 24 V (ac) or Short
Control Type Microprocessor control, this is not a safety (limit) control
Dimensions 8 1/16 IN H x 11 1/8 IN W x 2 15/16 IN D (204 x 282 x 74 MM)
Enclosure Material Blue PC+ABS plastic with metal top & bottom conduit connection walls
Enclosure NEMA Rating NEMA 1
Hydronic – HVAC Control Type Boiler Control
Modulating Output 4 x 0-10 V (dc) 500 ohms minimum load impedance / 4-20 mA 1 k ohms max load impedance
Power Supply 115 V (ac) plus / minus 10 percent, 60 Hz, 18 VA
Pump Relay 230 V (ac) 5 A, 1/3 hp
Relay Boiler pump,Valve, IDHW pump 230 V (ac) 5 A, 1/3 hp, primary pump 230 V (ac) 10 A, 1/2 hp, Alert relay 230 V (ac) 5 A, 1/6 hp
Sensor NTC thermistor, 10 k ohms at 77 degrees F (25 degrees C plus / minus 0.2 degrees C) Beta=3892