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  Tekmar Boiler Control - Two Stage / Modulating Boiler, DHW & SP
Tekmar Boiler Control - Two Stage / Modulating Boiler, DHW & SP
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Tekmar Boiler Control - Two Stage / Modulating Boiler, DHW & SP

The Boiler Control 263 is designed to stage multiple boilers or operate a modulating boiler using Outdoor Temperature Reset. It can be used in applications ranging from a single zone of baseboard, multiple baseboard and fan coil zones, to dedicated Domestic Hot Water heating in commercial buildings. This control regulates a single heating water temperature through Outdoor Temperature Reset, setpoint, and DHW target control. It is capable of controlling (stage and rotate) up to 2 on/off boilers, a single 2 stage boiler, or 1 modulating boiler as well as the system pump.


  • 1 modulating or 2 stage boiler control
  • Advanced settings to fine-tune building requirements
  • Automatic Boiler Differential
  • DHW Priority (optional)
  • DHW pump or valve operation
  • Equal Runtime Rotation
  • Exercising
  • Outdoor Temperature Reset
  • Powered boiler pump output
  • Quick setup for easy installation and programming of control
  • Setback input for energy savings
  • Test sequence to ensure proper component operation
  • User comfort adjustment to increase or decrease building space temperature
  • Warm Weather Shut Down


Control Microprocessor control. This is not a safety (limit) control
Packaged weight 3.3 lb. (1550 g)
Dimensions 6-5/8" H x 7-9/16" W x 2-13/16" D (170 x 193 x 72 mm)
Enclosure Blue PVC plastic, NEMA type 1
Approvals CSA C US, meets class B: ICES & FCC Part 15
Ambient conditions Indoor use only, 32 to 122°F (0 to 50°C), RH ≤80% to 88°F (31°C), down to 50% above 104°F (40°C), Altitude <6560 ft. (2000 m), Installation Category II, Pollution Degree
Power supply 115 V (ac) ±10%, 50/60 Hz, 600 VA
Relay capacity 230 V (ac) 5 A, 1/3 hp, pilot duty 240 VA
Demands 20 to 260 V (ac) 2 VA
Sensors NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) ß=3892
-Included Outdoor Sensor 070, Universal Sensor 082, 500&#8486; Resistor
-Optional tekmar type #: 071, 076, 077, 078, 082, 084
Warranty Limited 3 Year Warranty

Current Literature

Product Submittal

Jan 2012 - Present


Installation & Operation Manual

Mar 2009 - Present


Application Brochure

Mar 2009 - Current


RF Noise Interference

May 2009 - Present


Energy Savings with Outdoor Reset Brochure


Part Number: 263

2 +$768.87

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