Shop by Product Line
Underfloor Heating Mats
Tekmar Controls
Mixing Controls
Mixing Valves
Setpoint and Pump Controls
Snow Melting Controls
tekmarNet Controls
Heating System Controls
Tubing Fittings
Watts Onix Tubing
Watts Radiant RadiantPERT Coil
Coil Watts Radiant BarrierPEX+
Nibco Barrier PEX
Nibco Dura Pex
Tubing Clips & Ties
  Tekmar Boiler Control-One tN4, Four Modulating Boiler & DHW/ Setpoint
Tekmar Boiler Control-One tN4, Four Modulating Boiler & DHW/ Setpoint
Click to enlarge

Tekmar Boiler Control-One tN4, Four Modulating Boiler & DHW/ Setpoint

The Boiler Control 275 is designed to stage up to four condensing or non-condensing, modulating or on-off boilers using P.I.D. staging to accurately maintain temperature. Water temperature is controlled by Outdoor Temperature Reset for space heating applications or a fixed setpoint for Domestic Hot Water (DHW) tank heating or industrial process heating applications. The control will also accept an analog 0-10 V (dc) signal from an Energy Management System (EMS) to control the water temperature. Boiler Equal Run Time Rotation, pump exercising and stand-by system pump operation increase boiler plant reliability. The control is tekmarNet® communication compatible allowing for internet connectivity using an optional Gateway 483.


  • Access levels
  • Alerts
  • Automatic Boiler Differential
  • Boiler pump(s) operation (optional)
  • Control up to 4 modulating or on/off boilers
  • DHW Priority (optional)
  • DHW pump operation
  • Equal Runtime Rotation
  • Exercising
  • Outdoor Temperature Reset
  • Powered boiler pump output
  • Primary pump sequencing
  • Programmable Schedule
  • Test sequence to ensure proper component operation
  • User comfort adjustment to increase or decrease building space temperature
  • Warm Weather Shut Down
  • tekmarNet® 4 Compatible


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 ≤90% Non-condensing
Power supply 115 V (ac) ±10%, 60 Hz, 7 VA, 1150 VA max
Relay capacity 230 V (ac) 5 A, 1/3 hp
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, 2 of Universal Sensor 082, and 500Ω Resistor
-Optional tekmar type #:071,078,082
Warranty Limited 3 Year Warranty

Current Literature

Product Submittal

Jan 2011 - Present


Installation & Operation Manual

Nov 2010 - Present


Application Brochure

Nov 2002 - Nov 2003


RF Noise Interference

May 2009 - Present


Energy Savings with Outdoor Reset Brochure


Part Number: 275

2 +$1,119.57

Tell a Friend