10K NTC Insulated Floor Heating Thermostatic Sensor 15ft, Fit for SunStat Series Thermostats, Replacement Part FR-500110 81009178, Double Insulated 300V for Electric Underfloor Radiant Heating Systems

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• Core Specifications & Replacement Identification: This 10K NTC floor heating thermostat sensor is a direct replacement for part numbers FR-500110 and 81009178, with 15-foot (4.57m) double-insulated 300V jacketed gray wire. It has a low-profile design for easy installation, temperature measurement range of -40°F to 150°F (-40°C to 65°C), 10,000Ω resistance at 25°C (B-value 3435K), and weighs 0.85 pounds (385g), fitting electric underfloor radiant heating systems
• Full Compatibility with SunStat Thermostats: Fit for SunStat series thermostats, for SunStat Core (500670-SB, 500675-SB), for SunStat Command (500850-SB, 81020606), for SunStat Connect (120080WD-KIT-WIFI), for SunStat ConnectPlus (113901, 500900-SB), and for SunStat View (500750). It works with SunStat Relay II for expanded control, is SmartStart compatible, and not compatible with SunStat ConnectPlus Smart Sensor, ideal as a replacement sensor
• Widely Applicable Scenarios: Suitable for residential and commercial electric underfloor heating systems, such as bathrooms, kitchens, bedrooms, basements, hotel lobbies, offices and retail stores. It works with tile, ceramic, stone, wood, laminate, vinyl floors and low-pile carpet (≤1/4 inch), embedded in modified cement-based polymer mortar for optimal heat contact.Not for outdoor snow melting systems
• Precise Control & Safety Features: The 10K NTC thermistor provides precise floor temperature detection, compatible with SunStat SmartStart technology to auto-adjust heating cycles for consistent comfort. Its double-insulated design offers extra electrical safety, meeting residential and commercial standards. Prior to installation, measure resistance (close to 10KΩ) to ensure the insulated floor heating sensor is undamaged
• Easy Installation Guidelines: This 15 foot floor heating sensor is designed for embedded installation in mortar layers (1/2 inch deep), placed in the heating area center (≥12 inches from walls), avoiding furniture. For cable systems, place between two heating cables; for mat systems, place in mat center (≥6 inches from edges). Compatible with 120V/240V systems, ideal for new installations or replacement of lost/damaged sensors