Is the SBHT-203C the same as the Shelly BLU H&T ZB?

Yes. SBHT-203C is the model number of the Shelly BLU H&T ZB. On a Zigbee network it identifies itself as BLU H&T ZB from Shelly.

Does it need a Shelly gateway or the cloud to work with Edge?

No. In Zigbee mode it is a standard Home Automation temperature sensor, so it pairs with the Zigbee radio on an EpiSensor Gateway and Edge reads it directly. The Shelly app is only needed for firmware updates and calibration over Bluetooth.

Can it be used outdoors or in a bathroom?

It is rated IP54 and for -20 to 60 °C, so it handles steam and splashes in a bathroom. Shelly suggests sheltered outdoor spots such as a patio or balcony, and advises against direct exposure to heavy rain.

How long does the battery last?

Shelly rates the CR2032 coin cell for three years. Edge reports the battery percentage so the cell can be changed before the readings stop.

How do I update its firmware?

Over Bluetooth with the Shelly app. Zigbee firmware updates are not yet supported for Shelly devices, so update it before pairing it with the Gateway.

Shelly BLU H&T ZB

Temperature and humidity sensor

Model SBHT-203C: a 37 mm square coin-cell sensor with an SHT40 element, rated IP54 and for -20 to 60 °C. It talks both Bluetooth and Zigbee; five quick presses of its button put it on a Zigbee network, where it reports temperature, humidity and battery.

Zigbee

Temperature and humidity sensor

Compatibility

Compatible with EpiSensor Edge over Zigbee.

Pair it with the Zigbee radio on an EpiSensor Gateway. Edge reads it locally on the Gateway.

Edge reads 4 values from it, listed under Interface.

Connect it with

Gateway ZGW-20
From €899 ex VAT Configure Gateway

Specifications

The BLU H&T ZB, model SBHT-203C, is Shelly's small battery temperature and humidity sensor with both Bluetooth LE and Zigbee radios. It uses a Sensirion SHT40 sensing element and measures across -20 to 60 °C and 0 to 100 % RH. Shelly sells it in black, mocha and ivory.^1, 2

Power: Battery. One CR2032 3 V coin cell, included, rated for three years.¹
Sensing element: Sensirion SHT40²
Operating temperature: -20 to 60 °C¹
Humidity: 0 to 100 % RH¹
Ingress protection: IP54¹
Zigbee radio: IEEE 802.15.4, 2405 to 2480 MHz, below 8 dBm¹
Bluetooth radio: Bluetooth 5 LE, 2402 to 2480 MHz¹
Range: Up to 10 m indoors, 30 m outdoors³
Dimensions: 37 × 37 × 10 mm¹
Weight: 13 g¹
Mounting: On a flat surface¹
Interface: One push button, one red LED¹

Where it is used

Room temperature and humidity in offices, meeting rooms and homes, for comfort, ventilation and heating control.
Indoor environmental monitoring
Server rooms and comms cupboards, where a small IP54 sensor can sit near the equipment without cabling.
Server room and rack temperature monitoring
Bathrooms, basements and storage rooms, watching humidity to prevent mould and to switch extraction or dehumidifiers.

Interface

Readings and settings, with units and ranges where Shelly publishes them. readable, writable only.

Download

Reading	Unit	Range or values	Access
Measurements 2
Temperature	°C	-	Read only
Humidity	%	-	Read only
Settings 1
Identify	-	`identify`	Write only
Diagnostics 1
Battery	%	0 to 100 %	Read only

Profile 0x0104 (Home Automation), device type 0x0302, endpoint 1. Temperature is in cluster 0x0402, humidity in 0x0405 and battery percentage remaining in 0x0001, each reportable.²

It reports its Zigbee model as BLU H&T ZB with manufacturer Shelly. The display version, BLU H&T Display ZB (SBHT-103C), is a separate device that also reports light level.⁵

The sensor sleeps between reports, so an identify command may need the sensor awake before it takes effect. A single press of the button sends the current readings at once.^1, 4

Temperature and humidity offsets are Bluetooth settings, in 0.1 °C and 1 % RH steps, set from the Shelly app rather than over Zigbee.²

Setup

Update the firmware first
Insert the battery and update the sensor over Bluetooth with the Shelly Smart Control app. Its firmware cannot yet be updated over Zigbee.⁴
Open pairing in Edge
In Edge, open pairing on the Gateway's Zigbee network. The Gateway accepts new devices while pairing is open.
Press the button five times
Five quick presses start Zigbee pairing. The red LED flashes twice every 2 seconds for up to 1 minute while it searches.¹
Confirm the join
Check that Edge identifies it as Shelly BLU H&T ZB. Press the button once to send a reading straight away; the LED flashes once as it transmits.¹
Reset it if needed
To clear it for another network, remove and refit the battery, then hold the button for 30 seconds. One long flash confirms the factory reset. The reset only works shortly after the battery goes in.³

Common questions

Is the SBHT-203C the same as the Shelly BLU H&T ZB?: Yes. SBHT-203C is the model number of the Shelly BLU H&T ZB. On a Zigbee network it identifies itself as BLU H&T ZB from Shelly.^1, 5
Does it need a Shelly gateway or the cloud to work with Edge?: No. In Zigbee mode it is a standard Home Automation temperature sensor, so it pairs with the Zigbee radio on an EpiSensor Gateway and Edge reads it directly. The Shelly app is only needed for firmware updates and calibration over Bluetooth.^2, 4
Can it be used outdoors or in a bathroom?: It is rated IP54 and for -20 to 60 °C, so it handles steam and splashes in a bathroom. Shelly suggests sheltered outdoor spots such as a patio or balcony, and advises against direct exposure to heavy rain.¹
How long does the battery last?: Shelly rates the CR2032 coin cell for three years. Edge reports the battery percentage so the cell can be changed before the readings stop.¹
How do I update its firmware?: Over Bluetooth with the Shelly app. Zigbee firmware updates are not yet supported for Shelly devices, so update it before pairing it with the Gateway.⁴