--- product_id: 461581801 title: "SunTouch Sunstat Relay R4" brand: "suntouch" price: "$293.17" currency: USD in_stock: true reviews_count: 2 category: "Sun Touch" url: https://www.desertcart.us/products/461581801-suntouch-sunstat-relay-r4 store_origin: US region: United States of America --- # 15A dual voltage power Wi-Fi & app control 915MHz wireless tech SunTouch Sunstat Relay R4 **Brand:** suntouch **Price:** $293.17 **Availability:** βœ… In Stock ## Summary > πŸ”₯ Elevate your space with smart warmth β€” control comfort at your fingertips! ## Quick Answers - **What is this?** SunTouch Sunstat Relay R4 by suntouch - **How much does it cost?** $293.17 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/461581801-suntouch-sunstat-relay-r4) ## Best For - suntouch enthusiasts ## Why This Product - Trusted suntouch brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Expand Your Warmth:** Daisy-chain up to 10 relays for heating coverage up to 3,000 sq. ft.β€”perfect for large spaces. - β€’ **Safety First, Always:** Built-in GFCI and status indicators ensure reliable, worry-free operation every time. - β€’ **Control From Anywhere:** Free Watts Home app lets you monitor and adjust your floor heating remotely on iOS & Android. - β€’ **Power Meets Precision:** Dual-voltage 120V/240V relay supports up to 15 amps for robust floor heating control. - β€’ **Seamless Smart Integration:** Wirelessly connects via 915MHz to SunStat thermostats with Alexa & Google voice compatibility. ## Overview The SunTouch SunStat Relay R4 is a high-capacity, dual-voltage (120V/240V) relay designed to extend SunTouch floor heating systems requiring over 15 amps. Featuring built-in GFCI safety, 915MHz wireless communication, and compatibility with SunStat Connect thermostats, it enables smart, scalable control of up to 3,000 sq. ft. via app and voice commands. Ideal for modern, large-scale residential or commercial radiant heating installations. ## Description The SunTouch SunStat Relay R4 is an advanced 120V/240V dual-voltage device designed specifically to control the voltage for SunTouch electric floor heating systems that require more than 15 amps. It is equipped with built-in GFCI and status indicators, ensuring safe and reliable operation.Capable of direct wired connections to SunStat thermostats, including Connect Plus, Connect, and Command, this relay provides simple and efficient control of larger heating systems. Please note that it should not be used with older model thermostats or relays and each relay requires an additional 20-amp circuit and individual circuit breaker to function properly.Utilizing 915MHz wireless technology, the Relay R4 supports Wi-Fi connectivity and can connect wirelessly to the SunStat ConnectPlus Thermostat, enabling seamless interaction with mobile apps available for both Android and iOS devices. This connectivity extends to voice control functionality, as the system is compatible with Alexa and Hey Google. With the free Watts Home app, users can conveniently monitor and control their floor warming system from anywhere at any time, adding a layer of modern convenience.Additionally, the SunStat Relay R4 is highly capable, managing up to 150 square feet of heating at 120V or 300 square feet at 240V. For larger installations, the relay allows for the daisy-chaining of up to ten relays, enabling expansive control of up to 1,500 square feet at 120V or 3,000 square feet at 240V. This scalability makes the Relay R4 an ideal solution for both residential and commercial applications. Review: Perfect replacement for SunTouch C3 - Perfect replacement for our SunTouch Relay C3 that had failed after 6.5 years. They redesigned the communication wire block, making it much harder to get the wires set. That was annoying for thr install, but functionality is perfect Review: Avoid this item - no mechanism to control temperature - This thermostat did not have any control or mechanism to set the temperature of the heated floor system. I assumed that was basic functionality for a thermostat, but apparently I should have researched more before purchasing. ## Features - VOLTAGE CONTROL: The SunTouch SunStat Relay R4 is not a thermostat. This device is designed to extend the area controlled by a Sunstat thermostat. The SunStat Relay R4 is a dual-voltage 120V/240V device that controls the voltage to SunTouch electric floor heating systems that require more than 15 amps; it should not be used with older model thermostats or relays. Includes built-in GFCI and status indicators to ensure safe operation. - ENHANCED COMPATIBILITY: This relay device wires directly to SunStat thermostats - Connect Plus, Connect, and Command - for simple control of larger systems. Each relay requires an additional 20-amp circuit and individual circuit breaker. Please refer to User Manual below for step-by-step installation. - WIRELESS COMMUNICATION: Utilizing advanced 915MHz wireless technology, the SunStat Relay R4 can also communicate wirelessly with the SunStat ConnectPlus Thermostat, which supports Wi-Fi connectivity with apps for Android and iOS mobile devices and works with Alexa and Hey Google for voice control of your floor warming system. The free Watts Home app enables convenient monitoring and control of your system from anywhere and any time. - HIGH-CAPACITY COVERAGE: This relay device can control up to 150 sq. ft. at 120V or 300 sq. ft. at 240V. Additionally, it allows daisy-chaining of up to ten relays for expansive control of up to 1,500 sq. ft. at 120V or 3,000 sq. ft. at 240V, making it ideal for large-scale installations. - FEEL THE SUN: SunTouch provides a wide range of electric floor heating and snow melting systems that are widely used in residential, commercial, and institutional projects to create comfortable, warm, safe, inviting spaces. With more than 30 years of experience in electric radiant heating, we are proud to deliver quality products, simple-design services, and world-class support. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B09TRXV6L5 | | Best Sellers Rank | #42,966 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #661 in Heaters & Heater Accessories | | Brand | SunTouch | | Brand Name | SunTouch | | Coil Resistance | 15 | | Coil Voltage | 240 volts_of_alternating_current | | Connector Type | Plug-in Or Quick Connect | | Contact Current Rating | 15 A | | Contact Material | Brass | | Contact Type | Normally Open | | Current Rating | 15 A | | Customer Reviews | 3.9 out of 5 stars 8 Reviews | | Included Components | Relay SunTouch Controller | | Item Type Name | Relay R4 for 15 Amps Heating Systems for 120V and 240V | | Manufacturer | Watts | | Maximum Switching Current | 15 A | | Maximum Switching Voltage | 240 volts | | Minimum Switching Voltage | 120 volts_of_alternating_current | | Model | 500980 | | Mounting Type | Panel Mount or DIN Rail Mount | | Number of Terminals | 2 | | Operation Mode | Automatic | | Part Number | 81020608 | | Specification Met | 4-ul Certified | | UPC | 840213021542 | | Unit Count | 1 Count | | Wattage | 4800 watts | ## Product Details - **Connector Type:** Plug-in Or Quick Connect - **Contact Material:** Brass - **Contact Type:** Normally Open - **Current Rating:** 15 Amps - **Mounting Type:** Panel Mount or DIN Rail Mount ## Images ![SunTouch Sunstat Relay R4 - Image 1](https://m.media-amazon.com/images/I/51M7Ew+VddL.jpg) ![SunTouch Sunstat Relay R4 - Image 2](https://m.media-amazon.com/images/I/415TxH+K6ZL.jpg) ![SunTouch Sunstat Relay R4 - Image 3](https://m.media-amazon.com/images/I/41OhZqsNBtL.jpg) ![SunTouch Sunstat Relay R4 - Image 4](https://m.media-amazon.com/images/I/61mawYSQrfL.jpg) ![SunTouch Sunstat Relay R4 - Image 5](https://m.media-amazon.com/images/I/6186J4EENxL.jpg) ## Available Options This product comes in different **Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Perfect replacement for SunTouch C3 *by T***M on April 2, 2026* Perfect replacement for our SunTouch Relay C3 that had failed after 6.5 years. They redesigned the communication wire block, making it much harder to get the wires set. That was annoying for thr install, but functionality is perfect ### ⭐ Avoid this item - no mechanism to control temperature *by B***O on March 29, 2026* This thermostat did not have any control or mechanism to set the temperature of the heated floor system. I assumed that was basic functionality for a thermostat, but apparently I should have researched more before purchasing. --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/461581801-suntouch-sunstat-relay-r4](https://www.desertcart.us/products/461581801-suntouch-sunstat-relay-r4) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-08-23*