Can this be used for a gas insert fireplace?

Yes, it is a millivolt thermostat. It takes two wires from the gas fireplace. There is a safety strip you have to remove to activate the thermostat.

Is this setup to handle AUX heat?

Hi Gilbert, this is a millivolt thermostat that can control a single stage heat only system. You can contact our tech support team at (800) 468-1502 or through social media and we will be happy to recommend you a thermostat compatible with Aux heat. - Maria

Is the off position really off, or just the lowest setting?

Hi Chris, thank you for reaching out! The Off system setting at the thermostat will ask the HVAC system to go off. If you need further assistance, contact us at 1-800-468-1502, or through Facebook and Twitter under Honeywell Home.- Charlie

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CT33A1009 Economy Non-Programmable Thermostat - Millivolt Heat Only | CT33A1009/E1

Product ID: 24004661

Details

Brand
Honeywell Home
Controller Type
Hand Control
Model Name
CT33A Economy
Product Dimensions
0.88"D x x
Special Feature
Low Voltage

⚡750 mV power source

🌡️Dual Fahrenheit/Celsius scale

🛠️Easy wall-mount installation

Description

🔥 Keep it simple, stay cozy — the thermostat that just works! 🏡

PLUG PLAY INSTALLATION - Comes with all mounting hardware and decorative wall plate for a sleek, professional look.
CLASSIC MANUAL DIAL SIMPLICITY - Intuitive lever control lets you fine-tune your comfort with a satisfying tactile feel.
EFFORTLESS TEMPERATURE CONTROL - Bimetal sensor ensures simple, reliable heating adjustments without tech headaches.
MERCURY FREE SNAP ACTION SWITCH - Eco-friendly magnetic switch delivers precise on/off control—no leveling needed.
UNIVERSAL MILLIVOLT COMPATIBILITY - Seamlessly works with 750 mV heating systems like gas fireplaces and steam setups.

The Honeywell Home CT33A1009/E1 CT33A Economy Millivolt Thermostat is a non-programmable, wired heating controller designed for 750 mV systems. Featuring a mercury-free snap-action switch and dual temperature scales, it offers straightforward manual temperature adjustments with easy wall-mount installation. Ideal for gas fireplaces, steam, and gravity heating systems, this compact, durable thermostat combines classic design with reliable performance.

Specifications

ASIN	B000FPCERM
Additional Features	Low Voltage
Backlight	Yes
Best Sellers Rank	#70,476 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #35 in Home Nonprogrammable Thermostats
Brand Name	Honeywell Home
Color	White
Connectivity Protocol	Wired
Connectivity Technology	Wired
Control Method	Touch
Control Type	Dial Control
Controller Type	Hand Control
Customer Reviews	4.3 4.3 out of 5 stars (618)
Display Type	Digital
Finish Types	Matte
Global Trade Identification Number	00085267262439
Included Components	Mounting Hardware, Thermostat, User Manual, Wall coverplate, Wire Labels
Item Dimensions D x W x H	0.88"D x 3.12"W x 3.12"H
Item Type Name	Non-Programmable Thermostat
Item Weight	0.15 Pounds
Manufacturer	Honeywell Home
Manufacturer Part Number	CT33A1009
Material Type	Plastic
Model Name	CT33A Economy Millivolt
Model Number	CT33A1009/N
Mounting Type	Wall Mount
Power Source	750 mV
Product Style	Traditional
Screen Size	7.3 Centimeters
Shape	Square
Specific Uses For Product	Millivolt Heating
Temperature Control Type	Heating
UPC	085267262439
Unit Count	1.0 Count
Voltage	750 Millivolts

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