Is this a double pole thermostat?

It can be used as a single pole. My old thermostat had only 2 wires. Used the 2 black wires and not use the red. Works fine. I am not sure if it will turn off completely in this wiring sequence, but I never need to shut off.

How is this supposed to mount? It's described as if it is a replacement for a thermostat. That's not my situation.

Its a line-voltage thermostat. Typically it would take the place of a wall switch to control a switched plug. If you are looking for something to replace a 24 VAC furnace thermostat, this is not it.

What is the size? 9 X 7 X 4 appears to be very large?

4 1/2" tall and 2 7/8" wide. Depth is 1 1/2" outside of box (measured from the lip of the box. I used a full-depth box but can't tell how deep the switch extends into the box without taking it apart...

How accurate is it? I would be using it for a convection electric heater.

These can be calibrated. I have six of these to control 240V baseboard heaters. First, set them to the temperature that you want the room to be and let the temperature of the room stabilize for several hours. Note where on the dial where the pointer should be. Remove the cover, and then carefully remove the knob without disturbing its position. It snaps off. Then, place the knob back on so it points to the temperature of the room and push it so it snaps on. Replace the cover. If the control was turned when pushing the knob back on, remove it again and correct its position. I have done this with all six of my thermostats and they are all accurate now.

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Description

🔥 Dial into comfort with power and precision!

BUILT TO LAST - Durable mechanical design with UL certification and backed by Honeywell’s trusted 1-year warranty
POWERHOUSE PERFORMANCE - Handles up to 5280W for multiple heaters without breaking a sweat
UNIVERSAL COMPATIBILITY - Works seamlessly with electric baseboards, convectors, and fan-forced heaters—your all-in-one heating solution
SAFE SIMPLE INSTALLATION - 4-wire double-line break ensures positive OFF and hassle-free setup
PRECISION TEMPERATURE CONTROL - Manual dial lets you fine-tune comfort from 40°F to 80°F with bimetal sensor reliability

The Honeywell Home CT410B is a premium manual 4-wire line voltage thermostat designed for electric baseboard and fan-forced heaters. It supports up to 5280W, features a reliable bimetal temperature sensor, and offers precise manual temperature control from 40°F to 80°F. Its 4-wire double-line break design ensures safe, easy installation, making it a durable, UL-certified heating control solution trusted by professionals.

Specifications

Brand	Honeywell Home
Model Name	CT410B1017
Product Dimensions	1.5"D x 2.75"W x 4.5"H
Controller Type	Mechanical knob
Special Feature	Programmable
Color	White
Specific Uses For Product	Electric Baseboard Heater
Temperature Control Type	Heating
Connectivity Technology	Wi-Fi
Included Components	Install Guide, Mounting Hardware, Thermostat
Power Source	Corded Electric
Item Weight	5.6 ounces
Voltage	120 Volts
Material	Plastic
Shape	Rectangular
Display Type	Manual
Control Type	Dial Control
Control Method	Touch
Connectivity Protocol	BACnet MS/TP
Mounting Type	Wall Mount
Style	Thermostat
Backlight	Yes
Specification Met	UL
Wattage	5263 watts
UPC	085267276603
Global Trade Identification Number	00085267276603
Manufacturer	Honeywell Home
Part Number	CT410B1017
Item model number	CT410B
Is Discontinued By Manufacturer	No
Size	Inquiries - by email
Item Package Quantity	1
Type of Bulb	LED
Special Features	Programmable
Batteries Included?	No
Batteries Required?	No
Warranty Description	1 year warranty.

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