Honeywell Round Heat Only Thermostat (CT87K1004/E1)

Item no: 4212403 | 085267263672
300  Estimated 

20% off your purchase and free store pickup at your local Ace! (details)
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Ship to home is available. Leaves warehouse in 1 to 2 bus. days. (details)
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  • Product Type: Heat Only Thermostat
  • Voltage Rating: 15 volts
  • Control Type: Manual
  • Shape: Round
  • Vacation Mode: No
  • Batteries Included: No
  • Built In WiFi: No
  • Baseboard Heater Thermostat: No

This item can be shipped to your home. Or pickup this item at your local Ace Store for FREE*.

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What people are saying

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by PowerReviews
Honeywell Round Heat Only Thermostat (CT87K1004/E1)

(based on 4 reviews)

Ratings Distribution

  • 5 Stars



  • 4 Stars



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  • 2 Stars



  • 1 Stars




of respondents would recommend this to a friend.

Reviewed by 4 customers

Displaying reviews 1-4

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Quit working in less than 2 years

By Paul

from Hamilton MT

Verified Reviewer

Comments about Honeywell Round Heat Only Thermostat (CT87K1004/E1):

Unit failed after 20 months use--replaced with an old mercury thermostat I had on hand. Not a reliable product.

(5 of 5 customers found this review helpful)


Don't buy this one!

By Bob

from Chicago

About Me Handyman

Comments about Honeywell Round Heat Only Thermostat (CT87K1004/E1):

Tried 3 of these --- none worked. Contacted Honeywell help line. They said I must be getting thermostats from a "bad batch" - told me to go to a different store for one. I did get a different one - a different brand - & it worked immediately!!!! So much for Honeywell quality!

(3 of 3 customers found this review helpful)


Poor controlliing

By denny

from rose city, MI

About Me Homeowner, Motel owneroperator


  • Easy To Adjust
  • Easy To Install
  • Intuitive Controls
  • Look of old mercury stats


  • Some quit after 1-2yr use
  • Temp bandwidth 12 degrees
  • Temperature Doesn't Hold

Best Uses

    Comments about Honeywell Round Heat Only Thermostat (CT87K1004/E1):

    Honeywell's old "heat only" mercury tstats tracked better and lasted for decades. This electronic replacement version is pricey and doesn't perform or last anywhere as well. I have purchased several of these units and some track well and some don't. Some have quit working after 2 years of use. Honeywell is not that repair or replacement friendly either.

    (4 of 5 customers found this review helpful)


    works but not accurately

    By Jerry

    from Hamilton, MT

    About Me Homeowner

    Verified Buyer


    • Easy To Adjust
    • Easy To Install
    • Precise Controls


    • Room temp dial inaccurate

    Best Uses

      Comments about Honeywell Round Heat Only Thermostat (CT87K1004/E1):

      The thermostat was installed to control a pellet stove supplying heat to the second story of a cabin. It works but the lower dial that tracks room temperature reads low. I checked it against a separate thermometer.

      Displaying reviews 1-4

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