518 1 Stage Heat Thermostat Zoom

518 1 Stage Heat Thermostat


Brand: Tekmar

Qty Price
/ each
$291.80 / box (4 units x $72.95)
In Stock! Ships in 24-48 Hours
(28 Available)



Application: Heat Only
1 Heat
Programmability: Non-Programmable
User Interface: Push Button
Mount: Vertical
Options: Large Display
Enclosure Type: NEMA 1 Enclosure
Power Method: Hardwired
Low voltage
Color: White
Wiring: C
Control: Microprocessor PID control
Floor Sensor Compatible: Yes

Description for Tekmar 518


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. 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.


  • Radiant Floor Heating
  • Pulse Width Modulation
  • Auxiliary Sensor Input
  • Outdoor & Floor Temperature Display
  • Backlight
  • Freeze Protection
  • Limited 3 Year Warranty

  • Control: Microprocessor control. This is not a safety (limit) control
  • Packaged Weight: 0.53 lb
  • Dimensions: 3-11/16" H x 3" W x 15/16" D
  • 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
  • Sensors: NTC thermistor, 10 k Ω @ 77°F (25°C ±0.2°C) ß=3892
    • Included: None
    • Optional: Tekmar type # 070, 072, 073, 076, 077, 079, 084

518 1 Stage Heat Thermostat


by PowerReviews

(based on 2 reviews)

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Good Product

By Ted

from Raynham, MA

Verified Buyer



      Best Uses

        Good documentation for repacement of current thermostst. Functions well - controling floor temperature to +/- 1 degree F. Display viewable at distance in lighed room.

        • Was this a gift?:
        • No

        Tekmar 518

        By The wrong button pusher

        from Ocean Shores, WA

        Verified Buyer



            Best Uses

              This item was purchased to replace an older model that quit functioning properly. It was installed by a professional individual and was up and working in no time. This new model has fewer buttons so that temperature changes are made easier without changing other settings. As it controls about half of the temperature in the house it was a needed fix.

              • Was this a gift?:
              • No

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              1 Question | 1 Answer
              Displaying question 1
              • Q:

                does this thermostat display actual room temperature or just setpoint?
                Asked on 10/8/2014 by jon

                1 answer

                • CUSTOMER CARE


                  This thermostat displays setpoint and either outdoor or floor temperature for radiant heat.

                  Answered on 10/9/2014 by SupplyHouse Staff from New York
              Displaying question 1

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