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    SASWELL T21 Programmable Thermostat for Home, Digital Thermostat 1 Heat/1 Cool Compatible with Heat Pump and Single-Stage Systems, Dual Power Options Battery-Powered No C-Wire Required

    • [Wide Compatibility]This household thermostat supports single-stage heating and cooling systems, heat pumps without auxiliary heating, hydronic heating, boilers, gas fireplaces (24V), and 750 millivolt systems. Works seamlessly with gas, electric, and oil furnaces. Note: Before making a purchase, please ensure that the product description match your existing thermostat (verify that the base supports only 2 to 5 wires).
    • [Dual Power Options]It offers dual power options, operating via 24VAC or 2 size AA batteries, and requires no C-wire when battery-powered. For optimal performance and stability, it is highly recommended to connect the C-wire when using the productwhich also eliminates the need for frequent battery changes. Not Compatible: Heat pump with auxiliary or emergency heat, Dual fuel/hybrid heating, Electric baseboard heat (110-240 volts), Line voltage, Convectors, Radiant-ceiling heat, Mini split systems and 12V RV systems.
    • [User-Friendly Appearance Design]The cover cleverly conceals and protects some of the setting buttons and the battery slot, effectively preventing accidental program activation and related safety issues. It also features an easy-to-read backlight LCD screen with options to display temperatures in Fahrenheit or Celsius, making it simple and adaptable for all users.
    • [Memory Retention]This household thermostat preserves your custom settings during power outages, ensuring consistent comfort without the need for reprogramming.
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    Overview
    Specs
    Reviews
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    Any questions? Our AI beta will help you find out quickly.

    T21STK
    air conditioner

    1H/1C SYSTEM

    heat pump

    HEAT PUMP

    cooling only

    BOILER

    heating only

    COOLING ONLY SYSTEM

    T21STK

    Weekly Cycle Mode

    Personalized Programming

    Whether it’s the busy rhythm of weekdays or the leisurely weekend, T21 thermostat can accurately match your schedule, ensuring that the heating arrangement conforms to your living patterns. It is labor-saving.

    T21STK

    EASY DIY , Effortless Assembly

    Designed with user-friendliness in mind, T21 programmable thermostat is incredibly easy to assemble and use. Whether you’re a seasoned DIY enthusiast or a first-time installer, you’ll find the process straightforward and hassle-free.

    T21STK

    SASWELL's Selection

    https://m.media-amazon.com/images/I/31NCKvw50NL.__AC_SR200,225___.jpg

    T21STK 2H/1C Programmable

    https://m.media-amazon.com/images/I/31NCKvw50NL.__AC_SR200,225___.jpg

    T21HTW 1H/1C Programmable

    https://m.media-amazon.com/images/S/aplus-media-library-service-media/6a1f4f87-d9ac-4cb5-96bf-27a7d569b692.__CR192,91,1616,1818_PT0_SX200_V1___.jpg

    T18 3H/2C Programmable

    https://m.media-amazon.com/images/I/311oa4yNeLL.__AC_SR200,225___.jpg

    900STK 1H/1C Programmable

    Customer Reviews
    Price
    System Type
    1H/1C 2H/1C 3H/2C 1H/1C
    Power Source
    24VAC / Batteries 24VAC 24VAC 24VAC
    Display
    LCD LCD LED LCD
    WIFI
    ? ? ? ?
    Control Method
    Manual Manual APP Manual
    T21STK
    air conditioner

    1H/1C SYSTEM

    heat pump

    HEAT PUMP

    cooling only

    BOILER

    heating only

    COOLING ONLY SYSTEM

    T21STK
    Weekly Cycle Mode

    Personalized Programming

    Whether it’s the busy rhythm of weekdays or the leisurely weekend, T21 thermostat can accurately match your schedule, ensuring that the heating arrangement conforms to your living patterns. It is labor-saving.

    T21STK

    EASY DIY , Effortless Assembly

    Designed with user-friendliness in mind, T21 programmable thermostat is incredibly easy to assemble and use. Whether you’re a seasoned DIY enthusiast or a first-time installer, you’ll find the process straightforward and hassle-free.

    T21STK

    SASWELL's Selection

    https://m.media-amazon.com/images/I/31NCKvw50NL.__AC_SR200,225___.jpg

    T21STK 2H/1C Programmable

    https://m.media-amazon.com/images/I/31NCKvw50NL.__AC_SR200,225___.jpg

    T21HTW 1H/1C Programmable

    https://m.media-amazon.com/images/S/aplus-media-library-service-media/6a1f4f87-d9ac-4cb5-96bf-27a7d569b692.__CR192,91,1616,1818_PT0_SX200_V1___.jpg

    T18 3H/2C Programmable

    https://m.media-amazon.com/images/I/311oa4yNeLL.__AC_SR200,225___.jpg

    900STK 1H/1C Programmable

    Customer Reviews
    Price
    System Type
    1H/1C 2H/1C 3H/2C 1H/1C
    Power Source
    24VAC / Batteries 24VAC 24VAC 24VAC
    Display
    LCD LCD LED LCD
    WIFI
    ? ? ? ?
    Control Method
    Manual Manual APP Manual

    The SASWELL T21 Programmable Thermostat is designed to provide efficient and reliable temperature control for a variety of heating and cooling systems, including heat pumps and conventional single-stage systems. With its intuitive digital interface and user-friendly features, this thermostat offers a hassle-free way to manage your homes climate while maximizing comfort and energy savings.


    Product information

    Brand SASWELL
    Model Name T21STK-2
    Controller Type Push Button
    Color White
    Temperature Control Type programmable
    Included Components Temperature Sensor
    Power Source Battery Powered, Hardwired (24VAC)
    Voltage 24 Volts (AC)
    Display Type LCD
    Control Method App, Touch
    Mounting Type Wall Mount
    Style 1H/1C
    Manufacturer SASWELL
    Smart Home Compatibility Smart Home Compatible
    Package Dimensions 6.81 x 5.2 x 2.01 inches
    Item Weight 9.9 ounces
    Item model number T21STK-2
    Date First Available February 18, 2025

    Additional Features

    • [5+2 Programmable]Easily customize your weekly schedule with the 5+2 programming feature. Set different heating or cooling settings for weekdays and weekends to match your lifestyle and save energy effortlessly. Perfect for maintaining comfort and efficiency throughout the weeks.
    • [Easy DIY Installation]This digital thermostat is designed for quick, hassle-free setup. A detailed manual ensures smooth installation, making it perfect for DIY users upgrading the home system.

    Warranty & Returns

    Warranty, Returns, And Additional Information

    Warranty

    • Please contact the Seller directly for warranty information. Warranty information may also be found on the Manufacturer's website.
    • CONTACT

    Return Policies

    • Return for refund within: 30 days
    • Return for replacement within: non-replaceable
    • This item is covered by shiyishan Return Policy

    Manufacturer Contact Info

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