Will this unit operate on a 12 volt RV electrical system without the aaa batteries installed? Will the display be readable?

No, I tried this. You need the batteries. They last about a year. I does control the 12 Volt RV furnace properly when the batteries are installed. The temperature control is greatly improved versus the standard RV thermostat.

Can this be used for Gas Fireplace?

I use it for gas heating. You should be good to go for your gas fireplace.

I have several old circular Honeywell mercury thermostats which have two red wires only. Can I replace with this thermostat?

I have replaced about 25 1995-2000 model mercury t stats with this and the horizontal heat only model. Works great

I have an electic wall heater and electric baseboard heater on the same line, would this thermostat work in this case?

No, this thermostat is rated for 24 volt not 240 volt. This thermostat is not a line voltage thermostat. It would work on a gas furnace with 24 volt controls.

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🌡️ Stay warm, stay smart — the thermostat that works as hard as you do!

SLEEK MINIMALIST DESIGN - A clean white, wall-mounted thermostat that blends seamlessly into any modern workspace or home.
PRECISION COMFORT CONTROL - Set your ideal temperature effortlessly with a wide 40-90°F range tailored for heat-only systems.
HASSLE FREE BATTERY OPERATION - Enjoy cordless convenience powered by 2 AAA batteries—no wiring, no fuss.
ALWAYS VISIBLE AMBIENT DISPLAY - Stay informed with a constant, easy-to-read backlit LCD showing real-time room temperature.
BUILT IN COMPRESSOR PROTECTION - Safeguard your HVAC system with smart compressor protection for longer equipment life.

The Honeywell Nonprogrammable Heat Only Thermostat offers precise temperature control from 40 to 90°F with a clear backlit LCD display. Battery powered for easy installation, it features built-in compressor protection and continuously displays ambient temperature, making it a reliable, no-fuss heating solution for professional spaces and homes alike.

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The product quality is outstanding. Exactly what I needed for my work.

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Manufacturer	Honeywell
Part number	TH1100DV1000
Item Weight	207 g
Product Dimensions	11.91 x 7.32 x 2.87 cm; 207 g
Batteries	2 AAA batteries required.
Item model number	TH1100DV1000
Size	1 Pack
Color	White
Style	Traditional
Material	Plastic
Shape	Rectangular
Power source type	Battery Powered
Voltage	230 Volts
Item Package Quantity	1
Display Style	LCD
Plug Profile	Wall Mount
Special Features	Adjustable
Specific uses	Garage
Included components	thermostat
Batteries Included?	No
Batteries Required?	No
Battery Cell Type	Alkaline

HoneywellNonprogrammable Heat Only Thermostat, White, 1 Pack

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