White Rodgers 1A66-641 Line Voltage Thermostat: Four wire Model for 240V/22A Applications

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White Rodgers 1A66-641 Thermostat
Availability: Out of Stock
List Price: $48.27
Price Break: -$11.14
Our Price:
Out of Stock
Unbeatable Guarantee


The 1A66/1A66W by White Rodgers is designed for use on all types of electrical heating installations such as cable heat, baseboards, wall insert heaters, etc. Its narrow operating differential and the ability of its fully exposed knob to sense both radiant heat and room air temperature make this control ideal for use on such installations.

Guaranteed Satisfaction.

  1. 1 year limited manufacturer's warranty
  2. Up to 30 days to return your purchase
  3. Money back guaranteed
  4. Free return shipping
  5. No restocking fees


  • Model: 1A66-641
  • UPC: 786710414336
  • Product Type: Thermostat
  • Product Dimensions: L: 1.25" x W: 2.75" x H: 4.50"
  • Product Weight: 0.60 lbs.
  • Product Color: Beige
  • Application: Ideal thermostat for controlling baseboards, cable heat and glass panels
  • Voltage: 277 volts
  • Watts: 5000 watts
  • Amps: 22 amps
  • Certifications: UL
  • Heating/Cooling System Type: Electric Heat & Cooling
  • Voltage Type: Line Voltage
  • Programmable: No
  • Control Type: Dial
  • Digital Display: No
  • Temperature Displayed: Setpoint Only
  • Cooling Only: No
  • Heating Only: Yes
  • Single Stage: Yes
  • Program Type: Non -Programmable
  • Heat Current: 22 amps
  • Mounting: Vertical
  • Automatic Service Reminders: No
  • Power Method: Hardwired
  • System Switch Positions: Open on rise
  • Heating Temperature Range (F): 85
  • Accuracy: +/-1
  • Wireless: No


  • Current Rating for Higher Wattage Applications
  • Easy to Use!
  • Designed for use on 240V line voltage heating applications

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Ratings Summary
4.8 Star Rating: Good
4 out of 4 customers recommend this product.
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from Covington, WA
5.0 Star Rating: Outstanding
This product is built like they used to make in the 70's. I would highly recommend your products to those who want to own something that will last a life time.
Yes, I recommend this product.

from Covingtom, WA
5.0 Star Rating: Outstanding
I wanted quality, its hard to find! THX.
Yes, I recommend this product.

from Sewell, NJ
4.0 Star Rating: Good
Good value and quality.
Yes, I recommend this product.

from Reno, NV
5.0 Star Rating: Outstanding
I purchased three of these to replace ones that were nearly 40 years old. The installation was easy and straight forward. I just needed to add some wire nuts which did not come with the thermostat. (The original one had screw on terminals.) The thermostats work great, and I was very thankful to find they are still being manufactured.
Yes, I recommend this product.