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Emerson Thermostats 1E78-140 Non-Programmable Heat Only Thermostat for Single-Stage Systems

4.5 4.5 out of 5 stars 3,842 ratings

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Brand Emerson Thermostats
Model Name 1E78-140
Product Dimensions 1.13"D x 3.19"W x 5.31"H
Controller Type Hand Control
Color White

About this item

  • Easy-to-read digital display with backlight
  • Non-programmable thermostat
  • Compatible with single stage heat only systems
  • Precision control of plus/minus 1 degree F
  • Vertical profile. Thermostat Compatibility-Baseboard Heater
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Emerson Thermostats 1E78-140 Non-Programmable Heat Only Thermostat for Single-Stage Systems
Emerson Thermostats 1E78-140 Non-Programmable Heat Only Thermostat for Single-Stage Systems
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Price$26.18$34.95$74.99-12% $30.80
List:$34.99
-40% $19.19
List:$31.99
Delivery
Get it as soon as Tuesday, Mar 26
Get it Mar 28 - Apr 2
Get it Mar 26 - 28
Get it as soon as Tuesday, Mar 26
Get it as soon as Tuesday, Mar 26
Customer Ratings
Easy to install
4.7
4.3
4.6
4.3
Accuracy
4.5
4.5
4.2
4.2
Temperature Control
4.3
4.4
3.6
4.1
Easy to read
4.6
4.6
4.7
Sold By
Amazon.com
Maintak
FCRVM Parts
Amazon.com
Amazon.com
controller type
Hand Control
Hand Control
Hand Control
Hand Control
material
Plastic
Plastic
Plastic
shape
Curved
Rectangular
Rectangular
Rectangular
has backlight
weight
0.1 pounds
0.2 pounds
0.25 pounds

Product Description

The Emerson 1E78-140 Single Stage Thermostat Has An Easy To Read Digital Display. This Non-Programmable Thermostat Works With Most Single Stage Heat Only Systems. Is For Use On 24 Volt And Millivolt Systems. Not Compatible With Electric Baseboard Heat And Some Other Systems.

Product information

Technical Details

Additional Information

Warranty & Support

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Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Emerson Thermostats 1E78-140 Non-Programmable Heat Only Thermostat for Single-Stage Systems


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What's in the box

  • White-Rodgers 1E78-140 Thermostat Wall Dig Heat Only
  • Product guides and documents

    Looking for specific info?

    Customer reviews

    4.5 out of 5 stars
    4.5 out of 5
    3,842 global ratings

    Customers say

    Customers like the performance, ease of use, and quality of the tools. For example, they mention that it works well, is simple to install, and is an excellent unit for simple 2 wire controlled heaters. Customers also like the value, and accuracy. That said, opinions are mixed on temperature control, backlight, and battery life.

    AI-generated from the text of customer reviews

    407 customers mention340 positive67 negative

    Customers like the performance of the tool. They say it works well, is easy to use, and is a great replacement thermostat. Some appreciate the simplicity and quality of the product.

    "...all, those are passive, no batteries required, and they work on physics principles. What could go wrong?The answer is plenty!..." Read more

    "...I saw this one on Amazon and thought I would give it a try. It works great and it keeps my room at the temperature set on the thermostat...." Read more

    "This is easy to install and works perfect. With this thermostat the heat is very accurate." Read more

    "...This thermostat has worked flawlessly from day one." Read more

    342 customers mention315 positive27 negative

    Customers find the product easy to use. They mention that it's simple to install, use, and set the temperature exactly where they want it to be. They also appreciate the valid instructions and the large, easy-to-read display.

    "This is easy to install and works perfect. With this thermostat the heat is very accurate." Read more

    "Great heat controller was super simple to install. Now I can set the temp exactly where I want it to be...." Read more

    "...This thermostat was extremely easy to install for my two wire Keystoker coal stove. This thermostat has worked flawlessly from day one." Read more

    "...Even when the display is not illuminated the display is large and easy to read even for me with bad eyes...." Read more

    70 customers mention68 positive2 negative

    Customers are satisfied with the quality of the digital thermostat. They mention it's an excellent unit for simple 2 wire controlled heaters, a great replacement for the old style thermostats, and a perfect upgrade for an RV. Some say that it works fine for 12 volt RV furnaces and is a nice little upgrade from their original thermostat.

    "...This inexpensive digital thermostat is an excellent upgrade for an RV and it has changed my opinion of digital thermostats in general...." Read more

    "...Not a pretty solution, but quite acceptable for a basement wall...." Read more

    "Great replacement for the old style thermostats, simple installation, the unit is lite you have to set it to heat, hold both up and down, press up,..." Read more

    "Nice digital upgrade for the old mercury switch thermostats. Easy to install, accurate, decent cost." Read more

    68 customers mention68 positive0 negative

    Customers appreciate the value of the product. They say it's an affordable, super inexpensive upgrade that works perfectly for an RV heater. Customers also mention that it saves them money.

    "...This is saving propane, which saves me money. Plus, I love the backlight...." Read more

    "Exactly what I needed for my horse barn heaters at a great price. Will buy again for another barn." Read more

    "...It is inexpensive, quick and easy to install. most importantly, it works perfectly." Read more

    "Very good value. Easy to install. Does exactly what it says" Read more

    51 customers mention46 positive5 negative

    Customers are satisfied with the accuracy of the product. They mention that it is extremely accurate, provides a more accurate setting, and is easy to set up. Some say that the product is accurate for on and off heat. Overall, most are happy with their purchase and recommend it to others.

    "...The variance is only plus or minus about 1 degree. I am thrilled with this precise control. This is saving propane, which saves me money...." Read more

    "...Easy to install, accurate, decent cost." Read more

    "Simple and easy to install. This thermostat shows accurate reading.Any more options only confuse me." Read more

    "...No lag time and no inaccuracy as with the old spring loaded model...." Read more

    172 customers mention114 positive58 negative

    Customers are mixed about the temperature control of the tool. Some mention it has excellent temperature control, holds the room temperature exactly at the degree setting they input, and the temperature reading seems to be accurate. Others say that it does not keep the temperature, refuses to change the set temperature, and that the temperature setting became frozen.

    "...I can select whatever temperature I want and the thermostat will control the furnace precisely. The variance is only plus or minus about 1 degree...." Read more

    "...It works great and it keeps my room at the temperature set on the thermostat. The instructions looked more like hieroglyphics!..." Read more

    "...trailer that came with functional thermostat, but was very hard to read the temperature even with good eye sight...." Read more

    "...With this thermostat the heat is very accurate." Read more

    71 customers mention24 positive47 negative

    Customers are mixed about the backlight of the tool. Some mention that it's easy to operate and appreciate the back light not being constant. They also say that the amber backlit display is a nice feature. However, others say that it doesn't work.

    "...I was bummed at first the back light didn’t work just like many reviews. Most review showed back light working so I took a chance...." Read more

    "...This is saving propane, which saves me money. Plus, I love the backlight...." Read more

    "Backlight does not work! Called customer support, my call was transferred. After 3 min. of listening to the phone ring I was disconnected...." Read more

    "...has a back light what you get is a dark digital display with NO black light and a 2 degree variation to the actual temp...." Read more

    35 customers mention16 positive19 negative

    Customers are mixed about the battery life of the tool. Some mention that it takes regular batteries, while others say that it eats through batteries like crazy.

    "...Lol.Only negative I had was the batteries shipped with it were dead as a doornail, but I won’t dock a star for that." Read more

    "...After all, those are passive, no batteries required, and they work on physics principles. What could go wrong?The answer is plenty!..." Read more

    "...It is an inexpensive item and it shows." Read more

    "...Works using two AAA batteries, and the two wires to the heater. Wush it was available in black though." Read more

    Installation is very easy and it works!
    5 Stars
    Installation is very easy and it works!
    I have 22FB Sport Airstream trailer that came with functional thermostat, but was very hard to read the temperature even with good eye sight. Tried to replace with round Honeywell Thermostat. Purchased three units and none of them worked. I read the reviews about the Emerson Thermostat and how easy it was to install. Purchased the heat-only Emerson Thermostat from Amazon. The installation, including removal of the old thermostat, took only 10 minutes. Turned it on and it worked flawlessly. If you only have a gas furnace heater in your trailer, and you have a hard time reading the temperature on the stock unit that comes with the trailer, I highly recommend this Emerson model. It is inexpensive, quick and easy to install. most importantly, it works perfectly.
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    Top reviews from the United States

    Reviewed in the United States on November 29, 2023
    4 people found this helpful
    Report
    Reviewed in the United States on March 4, 2024
    Reviewed in the United States on March 1, 2024
    One person found this helpful
    Report
    Reviewed in the United States on February 11, 2024
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    jay
    4.0 out of 5 stars Great heat controller for my RV trailer
    Reviewed in the United States on February 11, 2024
    Great heat controller was super simple to install. Now I can set the temp exactly where I want it to be.

    I was bummed at first the back light didn’t work just like many reviews. Most review showed back light working so I took a chance. You would think it would be set to on as default setting. That’s why I give it 4 stars.

    I seen some reviews saying the lcd screen back light doesn’t work. Mine at first did not but that’s why they include instructions 🤔. All you have to do is read them 😂. All you have to do is turn the heat switch to heat. Hold up and down button for a few seconds. Then use up or down button to switch to on. Boom back light works. People need to read instructions instead of leaving bad reviews 😳.
    Images in this review
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    6 people found this helpful
    Report
    Reviewed in the United States on March 13, 2024
    Reviewed in the United States on December 18, 2023
    One person found this helpful
    Report
    Reviewed in the United States on February 15, 2024
    One person found this helpful
    Report
    Reviewed in the United States on March 11, 2021
    Customer image
    5.0 out of 5 stars Accurate temperature control
    Reviewed in the United States on March 11, 2021
    This thermostat was bought to replace a brand new Honeywell bimetal thermostat that failed to work in my application. The application is the sanctuary portion of a former church, so a large (30'x60'), open room with a vaulted ceiling. The building has a single stage forced hot air furnace with supply ducts at the front of the building only and a stairwell to the basement at the rear that acts as the cold air return. There is a ceiling fan that I keep on all winter to keep the hot air from stagnating at the ceiling level. The thermostat placement is at the rear of the building near the stairwell.
    The bimetal Honeywell was allowing a temperature variation of as much as 6 degrees between cycles and was causing a stuttering of the burner during the cycle (obviously very bad for the furnace!). I've had the Emerson in place for about three weeks now, and it has worked flawlessly from the start. The temperature variation is now about 3 degrees as measured by an independent thermometer placed in the center of the room. I would call that very good considering the size of the room. The burner runs smoothly throughout the cycle as well.
    Now for the installation issues that other people have addressed. My install is a simple two-wire (red and white) single-stage, heat only application, so I just followed the RH and W markings on the thermostat. Here's the catch: the Honeywell controller on the furnace does not indicate which of the two thermostat terminals is red or white. Well, you say, it's just a "temperature-controlled switch", so what difference does it make? But it does! If you look at a circuit diagram of the typical controller, one screw is connected to the center tap of the transformer (neutral or white), and the other (positive or red) is in circuit with the burner feed. Why the controllers aren't marked this way, I don't know, and until I ran into problems with the bimetal thermostat's operation, I was unaware of the issue as well. The thermostat connections are marked to show polarization, so it must make a difference, and it certainly did in my application.
    Obviously, if you're system is different from mine you may have to look deeper into the installation procedure, but for a simple, non-programmable heat-only thermostat that has digital accuracy, I would highly recommend this Emerson.
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    2 people found this helpful
    Report

    Top reviews from other countries

    Barbara Eklund
    5.0 out of 5 stars Great thermostat
    Reviewed in Canada on February 11, 2024
    Gurcharan Singh
    5.0 out of 5 stars Emerson 1E78-140 heating thermostat working ex
    Reviewed in Australia on April 25, 2021
    shiremaid
    5.0 out of 5 stars Very accurate, easy to read
    Reviewed in Canada on October 8, 2023
    Customer image
    shiremaid
    5.0 out of 5 stars Very accurate, easy to read
    Reviewed in Canada on October 8, 2023
    My electrician installed this model with my home rewiring over 8 years ago. It has never failed, I've only replaced the batteries twice. When one of the batteries leaked, I had to buy a new one. I went looking for the exact same model. I found it here on Amazon.ca. (Thank God Emerson kept this model in production after the merge with White Rodgers.)
    I love that it shows the temperature in Farenheit. I can see it so easily, thanks to the backlight function (which you have to turn on - thank you to the Amazon customers who gave simple instructions on how to do that!), the display uses large figures, very nice, so easy to install I did it myself, and accurate! I love the accuracy! When the first one had been installed, I had been using a dial thermostat for over 40 years. I was surprised any thermostat could be so accurate. Is it any wonder I went in search of the exact same model?
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    2 people found this helpful
    Report
    Gerald Goupil
    5.0 out of 5 stars Works perfectly. Manual was not for this device but it was easy to install
    Reviewed in Canada on January 14, 2024
    BG
    4.0 out of 5 stars Wall Mount
    Reviewed in Canada on February 16, 2023