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

💡Backlit LCD display

📏Compact 4.7x2.9x1.1 in

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50978 Ft

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Description

🔥 Stay cool, stay in control — the Pro 1000 means business!

BRIGHT CLEAR - Backlit LCD screen ensures easy reading day or night—never miss a setting
EFFORTLESS CONTROL - Manual push-button interface for intuitive, no-fuss temperature adjustments
SLEEK SPACE SAVVY - Fits perfectly in tight spots with a slim 4.7x2.9x1.1 inch profile
PLUG PLAY SIMPLICITY - Corded electric power with quick installation—upgrade your comfort in minutes
RELIABLE AMERICAN CRAFTSMANSHIP - Proudly made in the USA for trusted quality and durability

The Honeywell TH1100DV1000/U Pro 1000 is a compact, non-programmable thermostat featuring a bright backlit LCD display and manual push-button controls. Designed for easy wall mounting and powered by 24V corded electric supply, it offers reliable temperature management with American-made quality. Perfect for professionals seeking straightforward, efficient HVAC control without the complexity of programming.

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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50978 Ft

Duties & taxes included

In stock

Sold byAmazon HungaryDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hungary.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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