Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

Honeywell T651A3018/U Analog Line-Voltage Thermostat - Analog Thermostats
HoneywellAnalog Thermostats

Honeywell T651A3018/U Analog Line-Voltage Thermostat

The HONEYWELL T651A3018/U is an analog thermostat for heat or cool applications, featuring an exposed dial control and a 1H/1C stage configuration. It operates on 120 to 277V AC with SPDT switch action (open/close on…

SKU 3G-OTH-70358

Also listed as: T651A3018U · T651A3018 U · T651A3018-U

Brand
Honeywell
Item
T651A3018/U Analog Line-Voltage Thermostat
Category
Analog Thermostats
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 — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

Honeywell
Manufacturer Part Number
T651A3018/U
Type
Auto, 44° to 86°F, Exposed Dial
AC
120 to 277V
Stages
1H/1C
Voltage
120 to 277V AC
Application
Heat or Cool
Control Type
Exposed Dial
Fan Settings
No Fan Setting
System Settings
Auto
Switch Type/Action
SPDT, Open/Close on Rise
Temperature Control Range
44° to 86°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 Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The HONEYWELL T651A3018/U is an analog thermostat for heat or cool applications, featuring an exposed dial control and a 1H/1C stage configuration. It operates on 120 to 277V AC with SPDT switch action (open/close on rise) and a temperature control range of 44° to 86°F. The system setting is Auto, and it has no fan setting.

Frequently Asked Questions

What is the HONEYWELL T651A3018/U thermostat used for?

The HONEYWELL T651A3018/U is an analog line-voltage thermostat used for heat or cool applications in commercial or industrial spaces. It controls 1H/1C stages with an exposed dial and auto system setting, operating on 120 to 277V AC. It is suitable for baseboard heaters, fan-coil units, or similar HVAC equipment requiring SPDT switching.

What are the specifications of the HONEYWELL T651A3018/U thermostat?

The HONEYWELL T651A3018/U is a line-voltage analog thermostat with SPDT switch action (open/close on rise). It has a temperature control range of 44° to 86°F, operates on 120 to 277V AC, and supports 1H/1C stages. The system setting is Auto, with no fan setting. Control type is exposed dial.

Where to buy the HONEYWELL T651A3018/U thermostat worldwide?

You can source the HONEYWELL T651A3018/U thermostat 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; we provide competitive pricing and reliable sourcing for this analog thermostat.

How to install the HONEYWELL T651A3018/U line-voltage thermostat?

Install the HONEYWELL T651A3018/U by first turning off power at the circuit breaker. Mount the thermostat to a standard junction box, connect line and load wires per the SPDT wiring diagram (open/close on rise), and secure the exposed dial cover. Ensure voltage matches 120 to 277V AC. Test operation after power is restored.

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 analog 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

Cross-referenced by specification & description
Single-stage heat-only analog thermostat with exposed dial control. SPST switch opens on temperature rise. Operates on 120 to 277V AC. Temperature range 50° to 80°F. No fan setting. For line-voltage heating systems
HONEYWELL HOME
Single-stage heat-only analog thermostat with exposed dial control. SPST switch opens on temperature rise. Operates on 120 to 277V AC. Temperature range 50° to 80°F. No fan setting. For line-voltage heating systems
Wireless thermostat for heat and cool applications with automatic changeover. Features a touch screen, 7-day programming, and supports 2H/2C conventional or 3H/2C heat pump systems. Temperature control range 40° to 99°F. Rectangle shape, horizontal mounting. Terminal designations A-L/A
HONEYWELL HOME
Wireless thermostat for heat and cool applications with automatic changeover. Features a touch screen, 7-day programming, and supports 2H/2C conventional or 3H/2C heat pump systems. Temperature control range 40° to 99°F. Rectangle shape, horizontal mounting. Terminal designations A-L/A
Analog thermostat for heat-only control of single-stage heating systems. Features a dial control with a one-piece vented cover and SPST switch action. Operates at 120, 208, 240, or 277 volts AC. Temperature range 40 to 80 degrees Fahrenheit
HONEYWELL HOME
Analog thermostat for heat-only control of single-stage heating systems. Features a dial control with a one-piece vented cover and SPST switch action. Operates at 120, 208, 240, or 277 volts AC. Temperature range 40 to 80 degrees Fahrenheit
Digital proportional thermostat for heat and cool applications in VAV systems. Operates on 24V AC with a 0–10V DC output signal. Features push-button controls, automatic and manual changeover, and system settings of Heat-Cool-Off. Vertical mounting, rectangular shape, standard digit size, terminal designations T3, temperature control range 50° to 95°F
Honeywell
Digital proportional thermostat for heat and cool applications in VAV systems. Operates on 24V AC with a 0–10V DC output signal. Features push-button controls, automatic and manual changeover, and system settings of Heat-Cool-Off. Vertical mounting, rectangular shape, standard digit size, terminal designations T3, temperature control range 50° to 95°F
Indoor single-stage line-voltage mechanical thermostat with a temperature control range of 0° to 100°F and adjustable differential from 3° to 10°F. Features a steel enclosure, SPDT switch action (open/close on rise), and operates on 120 to 240V AC. Includes a 20 ft capillary with a 4-3/16 in x 1/2 in bulb. Suitable for HVAC temperature control in commercial or industrial settings
Honeywell
Indoor single-stage line-voltage mechanical thermostat with a temperature control range of 0° to 100°F and adjustable differential from 3° to 10°F. Features a steel enclosure, SPDT switch action (open/close on rise), and operates on 120 to 240V AC. Includes a 20 ft capillary with a 4-3/16 in x 1/2 in bulb. Suitable for HVAC temperature control in commercial or industrial settings
Indoor single-stage line voltage thermostat for heat or cool applications. Steel enclosure houses a hydraulic air coil sensing element with a -30° to 100°F range and 5°F differential. SPDT switch operates open/close on rise. Accepts 24 to 277V AC supply
Honeywell
Indoor single-stage line voltage thermostat for heat or cool applications. Steel enclosure houses a hydraulic air coil sensing element with a -30° to 100°F range and 5°F differential. SPDT switch operates open/close on rise. Accepts 24 to 277V AC supply

More from Honeywell

View all Honeywell parts