Tekmar Thermostat 518 – One Stage Heat


The Thermostat 518 accurately controls the room temperature for a hydronic heating zone using Pulse Width Modulation (PWM) technology. Simple up and down buttons and a display with large type make this thermostat easy to read and use.

SKU: 518 Categories: , Tags: ,

The 518 automatically detects a single auxiliary sensor to measure either outdoor, floor or remote room temperature. This easy to install thermostat is a direct replacement for tekmar Thermostats 507 and 508. An optional Adaptor Plate 012 is available which allows the thermostat to be installed onto a single gang electrical box.


  • Auto Heating Cycle
  • Auxiliary Sensor Input
  • Backlight
  • Freeze Protection
  • Outdoor & Floor Temperature Display
  • Pulse Width Modulation
  • Radiant Floor Heating


518 Installation & Operation

518 Submittal sheet

518 Quick Setup Guide

518 User Manual

Product Website


Control Microprocessor control. This is not a safety (limit) control
Packaged weight 0.53 lb. (240 g)
Dimensions 3-11/16″ H x 3″ W x 15/16″ D (94 x 76 x 24 mm)
Enclosure White PVC plastic, NEMA type 1
Approvals 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 10 to 30 V (ac/dc), 50/60 Hz, 1.8 VA standby, 56 VA max fully loaded, Class 2
Relay 30 V (ac/dc) 2 A, Class 2 circuits
Sensor NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) ß=3892
-Included None
-Optional tekmar type #: 070072073076077079084
Warranty Limited 3 Year Warranty


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