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
EMERSON Low Voltage Thermostat: Heat Only, RH/W, No Fan Setting, On, On/No Fan Setting - Analog Thermostats
EMERSONAnalog Thermostats

EMERSON Low Voltage Thermostat: Heat Only, RH/W, No Fan Setting, On, On/No Fan Setting

The EMERSON Low Voltage Thermostat: Heat Only is an analog thermostat in a rectangular shape, designed for vertical mounting. It operates on 30V AC with a temperature control range of 50° to 90°F and a temperature…

SKU 3G-OTH-70847

Brand
EMERSON
Item
Low Voltage Thermostat: Heat Only, RH/W, No Fan Setting, On, On/No Fan Setting
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

EMERSON
Manufacturer Part Number
01C20 102S1
Type
RH/W, No Fan Setting, On, On/No Fan Setting, Vertical
Shape
Rectangle
Voltage
30V AC
Digit Size
Standard
Application
Heat Only
Control Type
Slide Switch
Fan Settings
No Fan Setting
System Settings
On
Mounting Direction
Vertical
Terminal Designations
W
Temperature Differential
2°F Heating, 4°F Cooling
Temperature Control Range
50° to 90°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

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

Product Description

The EMERSON Low Voltage Thermostat: Heat Only is an analog thermostat in a rectangular shape, designed for vertical mounting. It operates on 30V AC with a temperature control range of 50° to 90°F and a temperature differential of 2°F for heating and 4°F for cooling. This heat-only unit features a slide switch control, no fan setting, and a single terminal designation of W for system settings set to On.

Frequently Asked Questions

What is the EMERSON Low Voltage Thermostat 01C20 102S1 used for?

The EMERSON Low Voltage Thermostat 01C20 102S1 is used for heat-only applications in residential or light commercial HVAC systems. It controls a single-stage heating system via a slide switch, with no fan setting, and operates on 30V AC. Typical installations include baseboard heaters, gas furnaces, or electric heat systems.

What are the specifications of the EMERSON 01C20 102S1 thermostat?

The EMERSON 01C20 102S1 is an analog, heat-only thermostat with a rectangular shape for vertical mounting. It operates at 30V AC, has a temperature control range of 50° to 90°F, and a temperature differential of 2°F for heating and 4°F for cooling. It features a slide switch, terminal designation W, and no fan setting.

Where to buy the EMERSON 01C20 102S1 thermostat worldwide?

You can source the EMERSON 01C20 102S1 thermostat worldwide through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time; we provide reliable sourcing for this EMERSON analog thermostat.

How to install the EMERSON Low Voltage Thermostat 01C20 102S1?

To install the EMERSON 01C20 102S1, first turn off power to the heating system. Mount the thermostat vertically on a wall away from drafts. Connect the 30V AC supply to terminal W per the wiring diagram. Set the slide switch to On and adjust the temperature dial. Always follow local electrical codes and the manufacturer's instructions.

Used in

Common applications for EMERSON
Commercial refrigeration — Emerson single-stage electronic control (SKU 44R204) for walk-in coolers and freezers
HVAC system retrofits — Emerson low-voltage digital thermostat (SKU 3MY10) for heat or cool control in office buildings
Industrial process temperature — Emerson line-voltage mechanical thermostat (SKU 2E399) for equipment heating in manufacturing
Residential heating — Emerson analog heat-only thermostat (SKU 3MU96) for baseboard or radiant systems
Heat pump installations — Emerson standard thermostat (SKU 42PD14) for 1H/1C heat pump systems in commercial spaces
Cooling-only applications — Emerson mechanical cool-only thermostat (SKU 3MU97) for server rooms or storage areas

EMERSON Products

3G Electric supplies EMERSON 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
EMERSON Low Voltage Thermostat: Heat Only, RH/W, Auto, On-Off, On-Off/Auto, Vertical, Rectangle (MPN 1E78-140). Key specifications — Application: Heat Only; Key Features: Selectable Celsius or Fahrenheit Temperature Display; Temperature Differential: 0.8° to 1.5°F; Voltage: 20V AC; Terminal Designations: RH; System Settings: On-Off; Temperature Control Range: 45° to 99°F; Shape: Rectangle.
EMERSON
EMERSON Low Voltage Thermostat: Heat Only, RH/W, Auto, On-Off, On-Off/Auto, Vertical, Rectangle (MPN 1E78-140). Key specifications — Application: Heat Only; Key Features: Selectable Celsius or Fahrenheit Temperature Display; Temperature Differential: 0.8° to 1.5°F; Voltage: 20V AC; Terminal Designations: RH; System Settings: On-Off; Temperature Control Range: 45° to 99°F; Shape: Rectangle.
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, C/G/L/O/B/R/W2/Terminal Designations, Auto-On (MPN 1F89EZ-0251). Key specifications — Application: Heat or Cool; Key Features: Home-Sleep-Away Preset Buttons; Temperature Differential: 0.6° to 1.7°F; Voltage: 20V AC; Terminal Designations: G; System Settings: Cool-Heat-Off; Temperature Control Range: 45° to 99°F; Changeover Type: Manual.
EMERSON
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, C/G/L/O/B/R/W2/Terminal Designations, Auto-On (MPN 1F89EZ-0251). Key specifications — Application: Heat or Cool; Key Features: Home-Sleep-Away Preset Buttons; Temperature Differential: 0.6° to 1.7°F; Voltage: 20V AC; Terminal Designations: G; System Settings: Cool-Heat-Off; Temperature Control Range: 45° to 99°F; Changeover Type: Manual.
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, C/E/G/L/O/B/R/W2/Terminal Designations, 20V AC (MPN 1F79-111). Key specifications — Application: Heat or Cool; Key Features: Selectable Celsius or Fahrenheit Temperature Display; Temperature Differential: 0.8° to 1.5°F; Voltage: 20V AC; Terminal Designations: Y; System Settings: Cool-Emergency Heat-Heat-Off; Temperature Control Range: 45° to 99°F; Changeover Type: Manual.
EMERSON
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, C/E/G/L/O/B/R/W2/Terminal Designations, 20V AC (MPN 1F79-111). Key specifications — Application: Heat or Cool; Key Features: Selectable Celsius or Fahrenheit Temperature Display; Temperature Differential: 0.8° to 1.5°F; Voltage: 20V AC; Terminal Designations: Y; System Settings: Cool-Emergency Heat-Heat-Off; Temperature Control Range: 45° to 99°F; Changeover Type: Manual.
EMERSON Line Volt Mechanical Tstat: Heat Only, On, 55° to 85°F, Exposed Dial, 120 to 240V AC, 1H (MPN 01 52 009S1). Key specifications — Application: Heat Only; Key Features: Dustproof Case; System Settings: On; Switch Type/Action: SPST, Open on Rise; Temperature Control Range: 55° to 85°F; Stages: 1H; Voltage: 120 to 240V AC; Brand: EMERSON.
EMERSON
EMERSON Line Volt Mechanical Tstat: Heat Only, On, 55° to 85°F, Exposed Dial, 120 to 240V AC, 1H (MPN 01 52 009S1). Key specifications — Application: Heat Only; Key Features: Dustproof Case; System Settings: On; Switch Type/Action: SPST, Open on Rise; Temperature Control Range: 55° to 85°F; Stages: 1H; Voltage: 120 to 240V AC; Brand: EMERSON.
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, B/G/O/RC/RH/W/Terminal Designations, Auto-On (MPN 01E78 144). Key specifications — Application: Heat or Cool; Key Features: Selectable Celsius or Fahrenheit Temperature Display; Temperature Differential: 0.8° to 1.5°F; Voltage: 20V AC; Terminal Designations: W; System Settings: Cool-Heat-Off; Temperature Control Range: 45° to 99°F; Changeover Type: Manual.
EMERSON
EMERSON Low Voltage Thermostat: Heat or Cool, Manual, B/G/O/RC/RH/W/Terminal Designations, Auto-On (MPN 01E78 144). Key specifications — Application: Heat or Cool; Key Features: Selectable Celsius or Fahrenheit Temperature Display; Temperature Differential: 0.8° to 1.5°F; Voltage: 20V AC; Terminal Designations: W; System Settings: Cool-Heat-Off; Temperature Control Range: 45° to 99°F; Changeover Type: Manual.

More from EMERSON

View all EMERSON parts →
EMERSON Low Voltage Thermostat: Heat Only, R/W, No Fan Setting, On, On/No Fan Setting, Vertical (MPN 1E30N-910). Key specifications — Application: Heat Only; Key Features: Vibration Resistant; Temperature Differential: 1°F Heating, 1.5°F Cooling; Voltage: 20 to 30V AC; Terminal Designations: R; System Settings: On; Temperature Control Range: 50° to 90°F; Shape: Rectangle.
EMERSON
EMERSON Low Voltage Thermostat: Heat Only, R/W, No Fan Setting, On, On/No Fan Setting, Vertical (MPN 1E30N-910). Key specifications — Application: Heat Only; Key Features: Vibration Resistant; Temperature Differential: 1°F Heating, 1.5°F Cooling; Voltage: 20 to 30V AC; Terminal Designations: R; System Settings: On; Temperature Control Range: 50° to 90°F; Shape: Rectangle.
EMERSON Line Volt Mechanical Tstat: Heat Only, On, 40° to 90°F, Concealed Dial, 120 to 240V AC, 1H (MPN 01 52 010S1). Key specifications — Application: Heat Only; Key Features: Dustproof Case; System Settings: On; Switch Type/Action: SPST, Open on Rise; Temperature Control Range: 40° to 90°F; Stages: 1H; Voltage: 120 to 240V AC; Brand: EMERSON.
EMERSON
EMERSON Line Volt Mechanical Tstat: Heat Only, On, 40° to 90°F, Concealed Dial, 120 to 240V AC, 1H (MPN 01 52 010S1). Key specifications — Application: Heat Only; Key Features: Dustproof Case; System Settings: On; Switch Type/Action: SPST, Open on Rise; Temperature Control Range: 40° to 90°F; Stages: 1H; Voltage: 120 to 240V AC; Brand: EMERSON.
EMERSON Low Voltage Thermostat: Heat and Cool, Manual, A/B/G/O/RC/RH/W/Terminal Designations (MPN 1F56N-444). Key specifications — Application: Heat and Cool; Key Features: Vibration Resistant; Temperature Differential: 1°F Heating, 1.5°F Cooling; Voltage: 20 to 30V AC; Terminal Designations: Y; System Settings: Cool-Heat-Off; Temperature Control Range: 50° to 90°F; Changeover Type: Manual.
EMERSON
EMERSON Low Voltage Thermostat: Heat and Cool, Manual, A/B/G/O/RC/RH/W/Terminal Designations (MPN 1F56N-444). Key specifications — Application: Heat and Cool; Key Features: Vibration Resistant; Temperature Differential: 1°F Heating, 1.5°F Cooling; Voltage: 20 to 30V AC; Terminal Designations: Y; System Settings: Cool-Heat-Off; Temperature Control Range: 50° to 90°F; Changeover Type: Manual.
EMERSON Low Voltage Thermostat: Heat and Cool, Manual, A/B/G/O/RC/RH/W/Terminal Designations, 30V AC (MPN 01C26 101S1). Key specifications — Application: Heat and Cool; Temperature Differential: 2°F Heating, 4°F Cooling; Voltage: 30V AC; Terminal Designations: Y; System Settings: Cool-Heat-Off; Temperature Control Range: 50° to 90°F; Changeover Type: Manual; Shape: Rectangle.
EMERSON
EMERSON Low Voltage Thermostat: Heat and Cool, Manual, A/B/G/O/RC/RH/W/Terminal Designations, 30V AC (MPN 01C26 101S1). Key specifications — Application: Heat and Cool; Temperature Differential: 2°F Heating, 4°F Cooling; Voltage: 30V AC; Terminal Designations: Y; System Settings: Cool-Heat-Off; Temperature Control Range: 50° to 90°F; Changeover Type: Manual; Shape: Rectangle.
EMERSON Low Voltage Thermostat: Heat and Cool, Manual, A/B/G/O/RC/RH/W/Terminal Designations (MPN 1E56N-444). Key specifications — Application: Heat and Cool; Key Features: Vibration Resistant; Temperature Differential: 1°F Heating, 1.5°F Cooling; Voltage: 20 to 30V AC; Terminal Designations: Y; System Settings: Cool-Heat-Off; Temperature Control Range: 50° to 90°F; Changeover Type: Manual.
EMERSON
EMERSON Low Voltage Thermostat: Heat and Cool, Manual, A/B/G/O/RC/RH/W/Terminal Designations (MPN 1E56N-444). Key specifications — Application: Heat and Cool; Key Features: Vibration Resistant; Temperature Differential: 1°F Heating, 1.5°F Cooling; Voltage: 20 to 30V AC; Terminal Designations: Y; System Settings: Cool-Heat-Off; Temperature Control Range: 50° to 90°F; Changeover Type: Manual.
EMERSON Mechanical Cool Only Thermostat: Cool Only, R/Terminal Designations, No Fan Setting, On (MPN 01C21 101S1). Key specifications — Application: Cool Only; Temperature Differential: 2°F Heating, 4°F Cooling; Voltage: 30V AC; Terminal Designations: Y; System Settings: On; Temperature Control Range: 50° to 90°F; Shape: Rectangle; Brand: EMERSON.
EMERSON
EMERSON Mechanical Cool Only Thermostat: Cool Only, R/Terminal Designations, No Fan Setting, On (MPN 01C21 101S1). Key specifications — Application: Cool Only; Temperature Differential: 2°F Heating, 4°F Cooling; Voltage: 30V AC; Terminal Designations: Y; System Settings: On; Temperature Control Range: 50° to 90°F; Shape: Rectangle; Brand: EMERSON.
EMERSON Low Voltage Thermostat: Heat Only, RH/W, No Fan Setting, On-Off, On-Off/No Fan Setting (MPN 01C20 101S1). Key specifications — Application: Heat Only; Temperature Differential: 2°F Heating, 4°F Cooling; Voltage: 30V AC; Terminal Designations: RH; System Settings: On-Off; Temperature Control Range: 50° to 90°F; Shape: Rectangle; Brand: EMERSON.
EMERSON
EMERSON Low Voltage Thermostat: Heat Only, RH/W, No Fan Setting, On-Off, On-Off/No Fan Setting (MPN 01C20 101S1). Key specifications — Application: Heat Only; Temperature Differential: 2°F Heating, 4°F Cooling; Voltage: 30V AC; Terminal Designations: RH; System Settings: On-Off; Temperature Control Range: 50° to 90°F; Shape: Rectangle; Brand: EMERSON.
EMERSON Low Voltage Thermostat: Heat Only, RH/W, Auto-On, On-Off, On-Off/Auto-On, Vertical (MPN 1E50N-301). Key specifications — Application: Heat Only; Key Features: Vibration Resistant; Temperature Differential: 1°F Heating, 1.5°F Cooling; Voltage: 20 to 30V AC; Terminal Designations: W; System Settings: On-Off; Temperature Control Range: 50° to 90°F; Shape: Rectangle.
EMERSON
EMERSON Low Voltage Thermostat: Heat Only, RH/W, Auto-On, On-Off, On-Off/Auto-On, Vertical (MPN 1E50N-301). Key specifications — Application: Heat Only; Key Features: Vibration Resistant; Temperature Differential: 1°F Heating, 1.5°F Cooling; Voltage: 20 to 30V AC; Terminal Designations: W; System Settings: On-Off; Temperature Control Range: 50° to 90°F; Shape: Rectangle.