Free Shipping & Free Returns*

FREE SHIPPING on Over 250,000 Products

Enjoy free shipping during the holidays! Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC and to all U.S. Military APO/FPO/DPO addresses.

Enjoy Our Extended FREE RETURNS

We want to ensure that making a return is as easy as possible! With our Hassle-Free, Extended Holiday Returns, eligible orders placed from November 12, 2025 on will benefit from an extended return deadline (January 13, 2026 or 30 days after receipt of your order - whichever is later). We'll even cover the cost of return shipping. Learn more about our Return Policy.

Shopping Cart

Code: 4FJ-H1A-NRS24221-518

MPN: 518

UPC: 779655051803

Product No Longer Available

Product Info for Tekmar 518 Thermostat 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. 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.image

Features of Tekmar 518 Thermostat One Stage Heat

  • Auto heating cycle, Auxiliary sensor input and backlight, Outdoor and floor temperature display; Freeze protection, Pulse width modulation, Radiant floor heating

Package Contents:

  • Tekmar 518 Thermostat One Stage Heat

Related Products to Tekmar 518 Thermostat One Stage Heat

Tekmar 518 Thermostat One Stage Heat Unavailable & Discontinued Models

List of Unorderable Models

  • Tekmar Thermostat One Stage Heat, 518 , MPN: 518 , UPC: 779655051803 , Code: 4FJ-H1A-NRS24221-518
Compare (0)