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

3G Electric
RFQ CartGet a QuoteSign inSign up
Honeywell Line Volt Mechanical Tstat: Heat or Cool, Auto, 44° to 86°F, Exposed Dial - Analog Thermostats
HoneywellAnalog Thermostats

Honeywell Line Volt Mechanical Tstat: Heat or Cool, Auto, 44° to 86°F, Exposed Dial

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

Brand
Honeywell
Item
Line Volt Mechanical Tstat: Heat or Cool, Auto, 44° to 86°F, Exposed Dial
Category
Analog Thermostats
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineer
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

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
View Full Spec Sheet

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 →

Similar products

Matched by specification & description
HONEYWELL HOME Line Volt Mechanical Tstat: Heat Only, On, 50° to 80°F, Exposed Dial, 120 to 277V AC (MPN T4398A1021). Key specifications — Application: Heat Only; System Settings: On; Switch Type/Action: SPST, Open on Rise; Temperature Control Range: 50° to 80°F; Stages: 1H; Voltage: 120 to 277V AC; Brand: HONEYWELL HOME; Control Type: Exposed Dial.
HONEYWELL HOME
HONEYWELL HOME Line Volt Mechanical Tstat: Heat Only, On, 50° to 80°F, Exposed Dial, 120 to 277V AC (MPN T4398A1021). Key specifications — Application: Heat Only; System Settings: On; Switch Type/Action: SPST, Open on Rise; Temperature Control Range: 50° to 80°F; Stages: 1H; Voltage: 120 to 277V AC; Brand: HONEYWELL HOME; Control Type: Exposed Dial.
HONEYWELL HOME Low Voltage Thermostat: Heat and Cool, Auto, 7 Day, Horizontal, Rectangle, Horizontal (MPN TH8320R1003). Key specifications — Application: Heat and Cool; Stages: 2H/2C Conventional, 3H/2C Heat Pump; Programming Capability: 7 Day; Shape: Rectangle; Terminal Designations: A-L/A; Temperature Control Range: 40° to 99°F; Changeover Type: Automatic; Brand: HONEYWELL HOME.
HONEYWELL HOME
HONEYWELL HOME Low Voltage Thermostat: Heat and Cool, Auto, 7 Day, Horizontal, Rectangle, Horizontal (MPN TH8320R1003). Key specifications — Application: Heat and Cool; Stages: 2H/2C Conventional, 3H/2C Heat Pump; Programming Capability: 7 Day; Shape: Rectangle; Terminal Designations: A-L/A; Temperature Control Range: 40° to 99°F; Changeover Type: Automatic; Brand: HONEYWELL HOME.
HONEYWELL HOME Analog Thermostat: Heat Only, 40° to 80°F, Dial, 120V AC/ 208V AC/ 240V AC/ 277V AC (MPN T410A1013). Key specifications — Application: Heat Only; Key Features: One-Piece Cover with Vents; Switch Type/Action: SPST; Temperature Control Range: 40° to 80°F; Stages: 1H; Voltage: 120V AC/ 208V AC/ 240V AC/ 277V AC; Brand: HONEYWELL HOME; Control Type: Dial.
HONEYWELL HOME
HONEYWELL HOME Analog Thermostat: Heat Only, 40° to 80°F, Dial, 120V AC/ 208V AC/ 240V AC/ 277V AC (MPN T410A1013). Key specifications — Application: Heat Only; Key Features: One-Piece Cover with Vents; Switch Type/Action: SPST; Temperature Control Range: 40° to 80°F; Stages: 1H; Voltage: 120V AC/ 208V AC/ 240V AC/ 277V AC; Brand: HONEYWELL HOME; Control Type: Dial.
HONEYWELL VAV Thermostat: Heat and Cool, Auto and Manual, Heat-Cool-Off, Vertical, Rectangle, 24V AC (MPN TB7980B1005/U). Key specifications — Application: Heat and Cool; Voltage: 24V AC; Terminal Designations: T3; System Settings: Heat-Cool-Off; Temperature Control Range: 50° to 95°F; Changeover Type: Automatic and Manual; Shape: Rectangle; Brand: HONEYWELL.
Honeywell
HONEYWELL VAV Thermostat: Heat and Cool, Auto and Manual, Heat-Cool-Off, Vertical, Rectangle, 24V AC (MPN TB7980B1005/U). Key specifications — Application: Heat and Cool; Voltage: 24V AC; Terminal Designations: T3; System Settings: Heat-Cool-Off; Temperature Control Range: 50° to 95°F; Changeover Type: Automatic and Manual; Shape: Rectangle; Brand: HONEYWELL.
HONEYWELL Line Volt Mechanical Tstat: 0° to 100°F, Steel, Adj, 3° to 10°F, 120 to 240V AC Volt (MPN T675A1565). Key specifications — Switch Type/Action: SPDT, Open/Close on Rise; Temperature Control Range: 0° to 100°F; Temperature Differential: 3° to 10°F; Voltage: 120 to 240V AC; Capillary Length/Bulb Diameter: 20 ft Capillary, 4-3/16 in x 1/2 in Bulb; Brand: HONEYWELL; Differential Type: Adjustable; Enclosure Material: Steel.
Honeywell
HONEYWELL Line Volt Mechanical Tstat: 0° to 100°F, Steel, Adj, 3° to 10°F, 120 to 240V AC Volt (MPN T675A1565). Key specifications — Switch Type/Action: SPDT, Open/Close on Rise; Temperature Control Range: 0° to 100°F; Temperature Differential: 3° to 10°F; Voltage: 120 to 240V AC; Capillary Length/Bulb Diameter: 20 ft Capillary, 4-3/16 in x 1/2 in Bulb; Brand: HONEYWELL; Differential Type: Adjustable; Enclosure Material: Steel.
HONEYWELL Line Volt Mechanical Tstat: Heat or Cool, Steel, -30° to 100°F, 5°F, Hydraulic Air Coil (MPN T631C1103/U). Key specifications — attr400419: 24 to 277V AC; attr400424: SPDT, Open/Close on Rise; attr400415: -30° to 100°F; attr400417: 5°F; attr400418: Hydraulic Air Coil; attr400408: Heat or Cool; attr408361: HONEYWELL; attr400410: Steel.
Honeywell
HONEYWELL Line Volt Mechanical Tstat: Heat or Cool, Steel, -30° to 100°F, 5°F, Hydraulic Air Coil (MPN T631C1103/U). Key specifications — attr400419: 24 to 277V AC; attr400424: SPDT, Open/Close on Rise; attr400415: -30° to 100°F; attr400417: 5°F; attr400418: Hydraulic Air Coil; attr400408: Heat or Cool; attr408361: HONEYWELL; attr400410: Steel.

More from Honeywell

View all Honeywell parts →