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  • Large easy to read backlit display
  • Soft-touch key operation
  • Auto change from heat to cool
  • Precise temperature control of +/-1 degrees Fahrenheit
  • Set point retained in memory (in the event of power outage)
  • Digital Heat and Cool
  • Easy-access battery replacement
  • DIY Installation
  • This model does not work with electric baseboard heat (120-240 V) and heat pump systems (w/ Auxiliary Heat)

The Honeywell RTH5100B Deluxe Non-Programmable Thermostat incorporates a highly responsive and easily readable display screen. The accompanying screen has been extended in length and features a green backlit display that makes dialing in your heating and cooling preferences an absolute breeze. This non-programmable thermostat will readily monitor your home's temperature in an effort to minimize drops and swings to ensure absolute comfort. The design of the RTH5100B also allows users to select their preferred temperature in a precise fashion with a +/-1 degrees Fahrenheit option.

  • Single-Stage Heating and Cooling: Yes
  • Multi-Stage Heating and Cooling: Yes
  • Heating Only: Yes
  • Cooling Only: Yes
  • Compatible with Warm Air Furnace: Yes
  • Compatible with Central Air Conditioning: Yes
  • Compatible with Heat Pump (No Aux./EM): Yes
  • Compatible with Heat Pump (With Aux./EM): No
  • Compatible with Hot Water: No
  • Compatible with Steam or Gravity: No
  • Use with Floor/Wall Furnace 24V or 750mV: Yes
  • Use with Volt Gas Fireplace 24V or 750mV: No
  • Use with Pellet Stove for mV Thermostats: No
  • Use with Electric Baseboard 120V-240V: No
Product Details
Product Specs
Product Manuals
Honeywell RTH5100B Deluxe Non-programmable Thermostat Video

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RTH5100B1025/U customer reviews

Overall Rating

15 Reviews
15 customers recommend this product
Honeywell RTH5100B Deluxe Non-programmable Thermostat Reviews
Brian Cross
January 3, 2020
Verified Purchase
Replacement thermostat

This was a replacement for a similar unit. Worked immediately.. Have always used Honeywell products

Joseph Liberty
November 29, 2019
Verified Purchase

Excellent product, works great. Will soon order another.

Sterling Saulsberry
July 25, 2019
Verified Purchase

Easy to use!!!!

Beverly Humphrey
July 17, 2019
Verified Purchase
programmable thermostat

Working very well

thomas waleska
March 28, 2019
Verified Purchase
Honeywell RTH5100B

Easy to install, worked 1st time and works great...tom

Richard Walicki
March 12, 2019
Verified Purchase

Easiest change over, get much better and consistent heat and cool. Simple changeover from present. Old mercury round one. Keeps a closer ratio for heat.

Anton Schanke
January 30, 2019
Verified Purchase
Why did I wait so long to replace

These thermostats are replacing my old Honeywell round ones, so far see a big distance. Just got a new oil delivery will see if it helps in burning less. Hope so

Carl Steiner
January 5, 2017
Verified Purchase

Have not had any problems. The installation was easy. I ordered online because I could not find this one in stores. Smooth transaction

Derek Boyd
June 8, 2016
Verified Purchase
Telling it like it is.

Easy to install and it is working fine.

Plunket Debora
February 17, 2016
Verified Purchase

This keeps the house nice and toasty, never wavers 1 degree. I would recommend this to everyone!

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