We ship to the Philippines — door-to-door, customs and logistics handled by 3G Electric

Honeywell Temperature Sensor: Wall Mount, Conduit Box - Room Temperature Sensors
HoneywellRoom Temperature Sensors

Honeywell Temperature Sensor: Wall Mount, Conduit Box

The Honeywell TR21-H/U is a wall-mount room temperature sensor in a conduit-box housing with wireless transmission. It offers a temperature accuracy of ±1 °F (12 °C to 30 °C) and is compatible with building…

SKU 3G-OTH-69517

Also listed as: TR21HU · TR21 H U · TR21-H-U

Brand
Honeywell
Item
Temperature Sensor: Wall Mount, Conduit Box
Category
Room Temperature Sensors
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support — the Philippines

Delivery
5–8 business days door-to-door; Bureau of Customs clearance typically 2–4 business days.
Payment
Invoicing in PHP or USD. Bank transfer and corporate PO accepted.
Ships to
Manila, Quezon City, Cebu, Davao, Batangas

Technical Specifications

Honeywell
Manufacturer Part Number
TR21-H/U
Display
No Display
Housing Type
Conduit Box
Product Type
Temperature Sensor
Mounting Location
Wall Mount
Temperature Signal
Wireless Transmission
Temperature Accuracy
±1 °F (12 °C to 30 °C)
Temperature Signal Output
Wireless Transmission
For Use With Building Automation Systems
Building Automation System Compatible

Technical Documents

No technical documents available for this product.
Request documentation
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

Honeywell Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The Honeywell TR21-H/U is a wall-mount room temperature sensor in a conduit-box housing with wireless transmission. It offers a temperature accuracy of ±1 °F (12 °C to 30 °C) and is compatible with building automation systems.

Supplied to the Philippines — compatible with 60 Hz installations. DHL Express delivery to Manila, Quezon City, Cebu, customs and duties handled door-to-door.

Frequently Asked Questions

What is the Honeywell TR21-H/U temperature sensor used for?

The Honeywell TR21-H/U is a wall-mount room temperature sensor designed for building automation systems. It provides wireless temperature transmission to HVAC controllers, enabling energy-efficient climate monitoring in commercial facilities, offices, and industrial spaces.

What are the specifications of the Honeywell TR21-H/U?

The Honeywell TR21-H/U is a wall-mount temperature sensor with a conduit-box housing. It features wireless transmission output, a temperature accuracy of ±1 °F (12 °C to 30 °C), and is compatible with building automation systems. It has no display and carries MPN TR21-H/U.

Where to buy the Honeywell TR21-H/U worldwide?

You can source the Honeywell TR21-H/U through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time.

How to install the Honeywell TR21-H/U temperature sensor?

Mount the Honeywell TR21-H/U on a wall using the conduit-box housing. Ensure the sensor is away from direct heat sources and drafts. Pair it with your building automation system following the manufacturer's wireless pairing instructions. Verify temperature accuracy after installation.

Used in

Common applications for Honeywell
Commercial kitchen and inflight-catering steam boilers — RM7890 / RM7895 flame relays with UV detection
Food-processing ramp-and-dwell ovens — DBC2000E / DBC2100E controllers
Hotel and hospital boiler plants — VR8205 combination gas controls
Petrochemical tank-farm heating — V4xxx gas-valve bodies with ML7420 actuators
Retrofit swap-outs from legacy Fireye / Satronic — Honeywell replacement kits

Honeywell Products

3G Electric supplies Honeywell room temperature sensors. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion Pumps & Compressors Spare Parts All Products

Compatible alternatives & equivalents

Cross-referenced by specification & description
Temperature Sensor: Wall Mount, Conduit Box, Wireless Transmission (MPN TR21-WK/U)
Honeywell
Temperature Sensor: Wall Mount, Conduit Box, Wireless Transmission (MPN TR21-WK/U)
Wall Module: Wall Mount, Conduit Box, 2-Wire Sylk Comm, Polycarbonate, Plastic (MPN TR40-H)
Honeywell
Wall Module: Wall Mount, Conduit Box, 2-Wire Sylk Comm, Polycarbonate, Plastic (MPN TR40-H)
Temperature and Humidity Sensor: Wall Mount, Digital, 32°F to 122°F (MPN TR100-TH-G)
Honeywell
Temperature and Humidity Sensor: Wall Mount, Digital, 32°F to 122°F (MPN TR100-TH-G)
HONEYWELL Remote Sensor: Temp, Indoor, Honeywell, Junction Box, Hardwired, 45° to 99°F (MPN TR21-A/U)
Honeywell
HONEYWELL Remote Sensor: Temp, Indoor, Honeywell, Junction Box, Hardwired, 45° to 99°F (MPN TR21-A/U)
HONEYWELL Remote Sensor: Temp, Indoor, Honeywell, Junction Box, Hardwired, 45° to 99°F (MPN TR21/U)
Honeywell
HONEYWELL Remote Sensor: Temp, Indoor, Honeywell, Junction Box, Hardwired, 45° to 99°F (MPN TR21/U)
Temperature/Humidity/CO2 Sensor: Wall Mount, Digital, 32°F to 122°F (MPN TR100-THC-G)
Honeywell
Temperature/Humidity/CO2 Sensor: Wall Mount, Digital, 32°F to 122°F (MPN TR100-THC-G)

More from Honeywell

View all Honeywell parts
Temperature Sensor: Wall Mount, Conduit Box, Analog, Wireless Transmission (MPN TR23/U)
Honeywell
Temperature Sensor: Wall Mount, Conduit Box, Analog, Wireless Transmission (MPN TR23/U)
Wall Module: Wall Mount, Conduit Box, 2-Wire Sylk Comm, Polycarbonate, Plastic (MPN TR40)
Honeywell
Wall Module: Wall Mount, Conduit Box, 2-Wire Sylk Comm, Polycarbonate, Plastic (MPN TR40)