Sonoff TH20 Elite Temp and Humidity Switch

Product Introduction

The Sonoff TH20 Elite Temp and Humidity Switch is a high-capacity smart environmental controller designed to automate devices based on real-time temperature and humidity conditions. Equipped with WiFi connectivity and a built-in LCD display, the TH20 Elite allows users to monitor environmental readings and automatically control connected appliances through intelligent automation.

Operating through the eWeLink smart home platform, the device enables remote monitoring, automation schedules, and sensor-based triggers to maintain optimal environmental conditions. With a powerful 20A switching capacity, the TH20 Elite is suitable for controlling higher-power appliances such as heaters, ventilation systems, humidifiers, and water heating equipment.

Key Features

Real-Time Temperature & Humidity Monitoring

Displays live environmental readings on the integrated LCD screen and within the mobile app for instant visibility.

20A High-Load Switching

Supports appliances up to 20A (approximately 4400W), making it suitable for heaters, geysers, ventilation fans, and climate control systems.

Smart Automation Based on Sensor Data

Automatically turn devices on or off when temperature or humidity reaches preset thresholds.

6-Month Environmental Data History

Track historical temperature and humidity data with hourly accuracy through the eWeLink app for deeper analysis.

Dry Contact Output

Supports low-voltage control systems such as boilers, HVAC relays, and automation controllers.

External Sensor Compatibility

Supports multiple sensors including:

• THS01 Temperature & Humidity Sensor
• DS18B20 Waterproof Temperature Probe
• MS01 Soil Moisture Sensor

Sensors connect via an RJ9 port for quick installation.

Smart Scheduling & Automation

Create automation programs and scheduled routines to maintain optimal environmental conditions automatically.

Smart Home Integration

The Sonoff TH20 Elite integrates with the eWeLink smart home ecosystem, allowing centralized device monitoring and automation control.

It also supports voice assistant integration with:

• Amazon Alexa
• Google Assistant

Automation scenes can trigger devices based on environmental readings, enabling intelligent climate control within smart home systems.

Technical Specifications

Product Type: Temperature & Humidity Smart Switch
Model: THR320D (TH20 Elite)
Connectivity: WiFi 2.4 GHz (IEEE 802.11 b/g/n)
Input Voltage: 100–240V AC, 50/60Hz
Maximum Load: 20A
Power Capacity: Up to approx. 4400W
Display: Built-in LCD screen
Processor: ESP32
Dry Contact Output: 5–30V, 1A
Supported Sensors: THS01, DS18B20, MS01
Data Storage: Up to 6 months of temperature & humidity history
Material: Flame-retardant PC V0 housing
Operating Temperature: −10 °C to 40 °C
Dimensions: 98 × 54 × 31 mm

What’s in the Box

Sonoff TH20 Elite Temp and Humidity Switch
User manual / quick start guide

Note: Temperature or humidity sensors are sold separately.