Send a part number, a photo, or a whole BOM — we supply it and stand behind it. EXW Singapore — collect from our office.

3G Electric
HONEYWELL HOME Wireless Thermostat - Wireless Thermostats
HONEYWELL HOMEWireless Thermostats

HONEYWELL HOME Wireless Thermostat

The HONEYWELL HOME Wireless Thermostat Kit (SKU YTHX9421R5101WW/U, MPN YTHX9421R5101WW/U) is a touch-screen wireless thermostat for heat and cool applications. It supports 3H/2C conventional and 4H/2C heat pump…

SKU 3G-OTH-70334

Also listed as: YTHX9421R5101WWU · YTHX9421R5101WW U · YTHX9421R5101WW-U

Brand
HONEYWELL HOME
Item
Wireless Thermostat
Part Number
YTHX9421R5101WW/U
Category
Wireless Thermostats
Available to Order
Also known as:YTHX9421R5101WW/UHONEYWELL HOME
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.
EXW Singapore
Collect or forward from our office
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.

Technical Specifications

HONEYWELL HOME
Manufacturer Part Number
YTHX9421R5101WW/U
Type
Auto and Manual, Horizontal, Rectangle
Day
7
Shape
Rectangle
Stages
3H/2C Conventional, 4H/2C Heat Pump
Application
Heat and Cool
Control Type
Touch Screen
Changeover Type
Automatic and Manual
Mounting Direction
Horizontal
Terminal Designations
A
Humidification Control
Yes
Programming Capability
7 Day
Temperature Control Range
40° to 99°F

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

Product Description

The HONEYWELL HOME Wireless Thermostat Kit (SKU YTHX9421R5101WW/U, MPN YTHX9421R5101WW/U) is a touch-screen wireless thermostat for heat and cool applications. It supports 3H/2C conventional and 4H/2C heat pump stages, with automatic and manual changeover, 7-day programming, and a temperature control range of 40° to 99°F. This rectangle-shaped unit mounts horizontally and includes humidification control and terminal designation A.

Frequently Asked Questions

What is the HONEYWELL HOME Wireless Thermostat Kit used for?

The HONEYWELL HOME Wireless Thermostat Kit controls heating and cooling in residential or light commercial HVAC systems. It supports 3H/2C conventional and 4H/2C heat pump stages, with automatic or manual changeover, 7-day programming, and humidification control for comfort management.

What are the specifications of the HONEYWELL HOME Wireless Thermostat Kit?

This thermostat supports 3H/2C conventional and 4H/2C heat pump stages, with a temperature control range of 40° to 99°F. It features a touch screen, automatic and manual changeover, horizontal mounting, 7-day programming, terminal designation A, and humidification control. The shape is rectangle.

Where to buy the HONEYWELL HOME Wireless Thermostat Kit worldwide?

3G Electric supplies the HONEYWELL HOME Wireless Thermostat Kit (MPN YTHX9421R5101WW/U) worldwide. As a global industrial equipment distributor, we handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time.

How to install the HONEYWELL HOME Wireless Thermostat Kit?

Installation requires mounting the thermostat horizontally on a wall, connecting wires per terminal designation A, and pairing it wirelessly with the receiver. Follow the manufacturer's manual for wiring and setup. For best results, ensure the system is powered off during installation and test operation after completion.

Used in

Common applications for HONEYWELL HOME
Commercial rooftop units — Honeywell Home VR8345K4809 dual-stage gas valve for direct spark ignition
Industrial boilers — Honeywell Home L6006A1145 immersion controller for high-limit and circulator control
Hydronic heating systems — Honeywell Home L4081B1047 circulator/high-limit controller with millivolt switching
Radiant floor heating — Honeywell Home L7224U1002 dual-function controller for high and low limit protection
Gas-fired furnaces — Honeywell Home VR8345M4302 single-stage gas valve for intermittent pilot ignition
Steam boilers — Honeywell Home L6081A1036 high/low limit controller with fixed differential
Not sure this is the right part? Photo-identify it→

HONEYWELL HOME Products

3G Electric supplies HONEYWELL HOME wireless thermostats. 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

More from HONEYWELL HOME

View all HONEYWELL HOME parts →

Customer reviews

No reviews yet — be the first

Questions & answers

No questions yet — ask us the first