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: 276996472

Details

Brand
Honeywell
Controller type
Push Button
Model name
Pro 1000
Product dimensions
2.9D x 7.3W x
Special features
Auto

⚡24V Corded Power

📏Compact 4.7x2.9x1.1 in

🔆Backlit LCD Display

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NZ$232

Duties & taxes included

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Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌡️ Elevate your workspace comfort with precision and style!

SLEEK VERTICAL DESIGN - Fits seamlessly on any wall with a premier white finish for a modern, professional look.
RELIABLE AUTO CHANGEOVER - Automatically switches between heating and cooling modes to maintain your ideal comfort zone.
EFFORTLESS MANUAL CONTROL - Intuitive push-button interface ensures precise temperature adjustments without the fuss.
TRUSTED AMERICAN CRAFTSMANSHIP - Proudly made in the USA, combining quality and durability you can count on.
ENERGY SMART WIRED CONNECTIVITY - Stable wired connection with 24V power ensures consistent performance and peace of mind.

The Honeywell TH1100DV1000/U Pro 1000 is a compact, wall-mounted vertical thermostat featuring a backlit LCD display and manual push-button controls. Powered by 24V corded electric supply and requiring 2 AAA batteries, it offers reliable auto changeover between heating and cooling. Made in the USA, this wired thermostat combines durability with a sleek premier white design, perfect for professional environments seeking straightforward, dependable temperature control.

Specifications

ASIN	B071X9DGHY
Additional Features	Auto Changeover
Backlight	Yes
Brand Name	Honeywell
Color	white
Connectivity Protocol	Wi-Fi
Connectivity Technology	Wired
Control Method	Remote
Control Type	Button Control
Controller Type	Push Button
Customer Reviews	4.6 4.6 out of 5 stars (1,292)
Display Type	lcd or led
Included Components	thermostat
Item Dimensions D x W x H	2.9D x 7.3W x 11.7H centimeters
Item Weight	0.05 Kilograms
Manufacturer Part Number	TH1100DV1000/U
Model Name	Pro 1000
Model Number	TH1100DV1000/U
Mounting Type	Wall Mount
Number of Batteries	2 AAA batteries required.
Power Source	Corded Electric
Screen Size	8 Inches
Shape	Rectangular
Specific Uses For Product	Air Conditioner
Temperature Control Type	Manual
Voltage	24 Volts

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