Shelly H&T Gen3 Wi-Fi temperature and humidity sensor with e-paper display, white

Product detailed description

This wireless sensor is designed for installation in residential and commercial buildings where continuous monitoring of indoor climate conditions is required. It is commonly used in heating, ventilation and air conditioning (HVAC) systems to provide real-time data for system optimisation. The device is suitable for installation in living areas, utility rooms and other interior spaces where temperature and humidity levels need to be tracked for comfort and safety. It is particularly useful in spaces where condensation or excessive humidity could lead to long-term structural issues.

The sensor operates independently of a central gateway, connecting directly to the local Wi-Fi network. This makes it ideal for retrofitting in existing buildings with established network infrastructure. The device is designed for use with smart home platforms and can be integrated into larger building automation systems via MQTT and webhook interfaces. It is not intended for outdoor use and should be installed in locations with stable environmental conditions within the specified operating range.

Technical parameters

Brand	Shelly
Manufacturer code	FG3800235261538
EAN	3800235261538
Product type	Wi-Fi temperature and humidity sensor
Model	H&T Gen3
Colour	white
Display	e-paper
Power supply	4× AA battery (LR6) 1.5 V or USB-C (not included)
Battery life	approximately 1 year
Connectivity	Wi-Fi 802.11 b/g/n, Bluetooth 4.2
Wi-Fi range	indoors up to 30 m, outdoors up to 50 m (depending on conditions)
Integrations	Amazon Alexa, Google Home, Samsung SmartThings, MQTT, webhooks
Operating temperature	0 to 40 °C
Ambient humidity	30 to 70 % RH
Dimensions	70 × 70 × 26 mm (with stand 70 × 70 × 45 mm)
Weight	47 g
Warranty	2 years
Code	SHE_FG3800235261538
Brand	SHELLY

The operating temperature range of 0 to 40 °C and humidity range of 30 to 70 % RH define the environmental conditions in which the sensor can be reliably used. The Wi-Fi range of up to 30 m indoors and 50 m outdoors (depending on conditions) determines the placement flexibility. The battery life of approximately one year is influenced by the type of batteries used, frequency of data transmission and signal strength. These parameters are essential for determining the suitability of the device for a given installation and for planning maintenance intervals.

Installation and connection

The sensor can be mounted on a flat surface or attached to a wall using screws or double-sided foam tape. It is important to ensure the device is placed in a location that is representative of the room's overall climate and not near heat sources or direct sunlight. The device does not require a power cable for permanent installation, as it can be powered by four AA batteries or via a USB-C connection. However, the battery compartment does not support charging, so replacement batteries must be used when the power is depleted.

During installation, it is important to verify that the Wi-Fi signal strength is sufficient for reliable communication. The device should be positioned within the recommended range of the router and away from physical obstructions that could interfere with the signal. Common installation mistakes include placing the device too close to metal objects or in areas with high electromagnetic interference, which can reduce signal quality and affect data transmission.

Compatibility and accessories

The sensor is compatible with a range of smart home platforms including Amazon Alexa, Google Home and Samsung SmartThings. It can also be integrated into more advanced automation systems using MQTT and webhook interfaces. For users requiring control based on sensor data, it can be used in conjunction with Shelly relays to trigger heating or ventilation systems when predefined thresholds are exceeded. Additional accessories such as batteries and a USB-C power supply are required for continuous operation but are not included in the standard package.

Technical background for designers

The sensor operates by measuring ambient temperature and relative humidity using internal sensors and transmitting the data wirelessly via Wi-Fi. The e-paper display consumes minimal power, allowing the device to operate for extended periods on battery power. The use of AA batteries provides flexibility in power supply options, making it suitable for both temporary and permanent installations. The device is designed to integrate with existing Wi-Fi networks and does not require additional hardware for communication. The operating life is influenced by the frequency of data transmission, battery type and environmental conditions.

The device's compact dimensions (70 × 70 × 26 mm) and lightweight (47 g) make it suitable for installation in a variety of locations without requiring extensive structural modifications. The use of Wi-Fi 802.11 b/g/n and Bluetooth 4.2 ensures compatibility with a wide range of network infrastructures. The integration with smart home platforms allows for remote monitoring and control, making it a valuable component in modern building automation systems.

Service and operation

The device requires minimal maintenance during normal operation. It is important to monitor the battery level and replace the batteries when the power is low. The device does not require regular calibration, but it should be checked periodically to ensure it is functioning correctly. If the display becomes unresponsive or the Wi-Fi connection is lost, the device should be reset and reconnected to the network. No scheduled service intervals are required, as the device is designed for long-term, low-maintenance use.

Frequently asked questions

Can the sensor control a boiler directly?
No, the device does not have a switching output. It can only monitor and transmit data, and control functions must be implemented using an external device such as a Shelly relay.

Is a hub required for operation?
No, the device connects directly to the local Wi-Fi network and does not require a separate hub or gateway for communication.

Can it be used outdoors?
No, the device is designed for indoor use only and is not suitable for outdoor environments. It must be installed in locations with stable temperature and humidity conditions.

Can it be powered continuously?
Yes, the device can be powered via a USB-C connection for continuous operation. However, the battery compartment does not support charging, so batteries must be replaced when they are depleted.