Can this be used on a 12v system?

Yes. I am using one on a 12 volt system and 5 on 500 milivolt systems. It should also work on a 24 volt system. It should be noted that this thermostat receives power to run the display and electronics from 2 AAA batteries that last a long time. These are required on a 500 milivolt system. The batteries can be omitted on a 12 or 24 volt system if (and only if) you have a 3 wire connection to the thermostat. The 3rd wire is the common terminal (which is not required for a mechanical thermostat with no clock, light, or electronics). You may use the batteries with a 3 wire system that doesn't need them. I believe this will cause it to hold its setting if the power goes out and comes back on. I believe (but am not sure) that the setting will be lost on a 3 wire system without batteries if the power goes out. On a 500 milivolt system the batteries are required.

Does this work on a gas fireplace with a 2 wire setup?

I am using this thermostat on a 2 wire setup. It works fine. Boba

How do you program this thermostat? (honeywell pro 1000)

There is no programming of this thermostat. It is for heat only.

Does this work for 12v DC furnace for camper/travel trailers?

Yes. I replaced the OEM thermostat that failed the first night in my 2017 Airstream with this exact model TH11000-1000 three years ago and it's worked great ever since. And I had the same model in my little camping trailer as well. Both were 12v propane fired forced air, although that makes no difference since the electronics in this thermostat are separately powered by two AAA batteries and all it has to do is make and break the two-wire heater connection.

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TH1100DV1000/U Pro 1000 Vertical Non-Programmable Thermostat

Product ID: 53880020

Details

Brand
Honeywell
Controller Type
Push Button
Model Name
Product Dimensions
1.3"D x 1.8"W
Special Feature
Temperature

📏Compact 4.7x2.9x1.1 in size

🔋Runs on 2 AAA batteries

🖥️Clear LCD temperature display

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Description

🔥 Elevate your comfort game with classic control! 🔥

SLEEK VERTICAL DESIGN - Fits seamlessly on any wall with a modern, glossy white finish.
CLEAR BACKLIT LCD DISPLAY - Easy-to-read temperature display even in low light, keeping comfort visible at all times.
ENERGY EFFICIENT OPERATION - Powered by 2 AAA batteries, combining convenience with low energy consumption.
EFFORTLESS TEMPERATURE CONTROL - Intuitive push-button interface for precise heating adjustments without programming hassle.
RELIABLE AMERICAN CRAFTSMANSHIP - Proudly made in the USA, ensuring quality and durability you can trust.

The Honeywell TH1100DV1000/U Pro 1000 is a compact, non-programmable vertical thermostat featuring a sleek white design and a clear backlit LCD display. Designed for simple, reliable heating control, it operates on 2 AAA batteries and is proudly made in the USA. Perfect for professionals seeking straightforward, energy-efficient temperature management without smart home complexity.

Specifications

ASIN	B071X9DGHY
Additional Features	Temperature Display
Backlight	Yes
Best Sellers Rank	#37,669 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #53 in Home Programmable Thermostats
Brand Name	Honeywell
Color	White
Connectivity Protocol	Wi-Fi
Connectivity Technology	Wi-Fi
Control Method	Touch
Control Type	Button Control
Controller Type	Push Button
Customer Reviews	4.6 4.6 out of 5 stars (1,375)
Display Type	LCD
Finish Types	Glossy
Included Components	Thermostat
Item Dimensions D x W x H	1.3"D x 1.8"W x 6.2"H
Item Weight	0.05 Kilograms
Manufacturer	Honeywell
Manufacturer Part Number	TH1100DV1000/U
Material Type	Plastic
Model Name	TH1100DV1000/U
Model Number	TH1100DV1000/U
Mounting Type	Wall Mount
Number of Batteries	2 AAA batteries required.
Power Source	Corded Electric
Product Style	Modern
Screen Size	8 Inches
Shape	Rectangular
Smart Home Compatibility	Not Smart Home Compatible
Specific Uses For Product	Air Conditioner
Temperature Control Type	Heating
Unit Count	1.0 Count
Voltage	24 Volts

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