518 (Tekmar) | Thermostat 1 Stage HeatThe 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
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