November 27, 2025
When we design radiant floor heating, radiant cooling, or snow-melt systems, one device silently does the job of protecting comfort, flooring, and system performance
The Slab Temperature SensorUnlike a wall thermostat that measures air temperature, a slab sensor measures the actual temperature inside the concrete floor.This matters because the floor itself is the thermal mass - it heats and cools slowly, stores energy, and directly affects comfort.Why Do We Use a Slab Sensor?1. Prevents Floors from Overheating (especially wood/vinyl)2. Improves Comfort by maintaining consistent radiant temperature3. Enhances Energy Efficiency – no over-heating or over-cooling4. Protects the System with freeze protection (snow-melt)5. Ensures Safe Radiant Cooling by preventing condensation (dew point)Where Is It Installed?1. Embedded within the concrete slabUsually inside a protective conduit for serviceability Installed near radiant PEX pipingUsed in:▪ Bathrooms▪ Living rooms▪ Outdoor ramps▪ Parking areas with snow-meltHow Does BMS Use Slab Sensor Feedback?The controller uses slab temperature to:1. Limit floor temperature (prevent too hot/cold floors)2. Maintain stable comfort even after thermostat is satisfied3. Activate freeze protection in snow-melt4. Control radiant cooling with dew-point lockout logicThis avoids common issues like “cold floors in winter” or “sweating floors in cooling.”Sensor Type (Common)1. 10k NTC thermistor, Waterproof, epoxy-coated, Simple 2-wire connectionWhy Consultants Specify ItBecause room temperature alone can mislead the controller, especially with high thermal mass floors. A slab sensor gives the BMS the true thermal picture.SummaryA slab sensor may look like a small component, but in radiant systems it is a mission-critical feedback device for safety, comfort, and energy savings.
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