White-Rodgers 70 Series Classic, Non-Programmable, Thermostat, 1E78-140
Condition: New
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Availability:
In Stock.
Arrives
Monday, Nov 2
At a glance
- Condition
- New
- Color
- White
- Model
- 1E78-140
- Dimensions
- 4.4"D x 1.8"W x 6.3"H
- Weight
- 1.6 oz
- Controller Type
- Hand Control
- Special Feature
- Easy to Read
- In the box
- White-Rodgers 1E78-140 Thermostat Wall Dig Heat Only
Features 10
- 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
- Dimensions: 5-5/16"H x 3-3/16"W x 1-1/8"D
- Large easy to read digital display
- Non-programmable thermostat
- Compatible with single stage heat only systems
- 10 Accuracy
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.
Specs 34
| Brand | White-Rodgers |
|---|---|
| Model Name | 1E78-140 |
| Product Dimensions | 4.4"D x 1.8"W x 6.3"H |
| Controller Type | Hand Control |
| Special Feature | Easy to Read |
| Additional Features | Easy to Read |
| Specific Uses For Product | Heater |
| Temperature Control Type | manual |
| Connectivity Technology | Wired |
| Power Source | Battery Powered |
| Voltage | 24 volts |
| Display Type | Digital |
| Control Type | Button Control |
| Control Method | Touch |
| Connectivity Protocol | BACnet MS/TP |
| Mounting Type | Wall Mount |
| Wattage | 45 |
| Number of Batteries | 3 AAA batteries required. (included) |
| Color | White |
| Shape | Curved |
| Product Style | 70 |
| Finish Types | Matte |
| Brand Name | White-Rodgers |
| Model Number | 1E78-140 |
| Manufacturer Warranty Description | 5 year limited. |
| UPC | 786710518348 |
| Global Trade Identification Number | 48 |
| Manufacturer | Copeland |
| Number of Items | 1 |
| Unit Count | 1 Count |
| Item Type Name | White-Rodgers 1E78-140 Thermostat Wall Dig Heat Only |
| Manufacturer Part Number | 1E78-140 |
| Item Dimensions D x W x H | 4.4"D x 1.8"W x 6.3"H |
| Item Weight | 1.6 ounces |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Monday, Nov 2
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Love this thermostat, works great and great display!
I love this heat only thermostat. It is easy to install and instructions are great. Even when the display is not illuminated the display is large and easy to read even for me with bad eyes. The display is so much better then the Honeywell rh110b that it replaces, which has a monochrome like display where the numbers are almost the same shade as the background and does not have a light. This is a perfect choice if you have just two wires, white and red used for forced hot water hydronic heat with an oil boiler. You also have to clip one of the jumpers on the circuit board that makes your boiler react correctly using hot water heat. The construction is also better then the Honeywell and easier to use. This replaces the old round Honeywell that had a twist dial and mercury switch which I used to have some years back. Update 11/14/19: I have put in to return this thermostat and get a new one. The flame Icon doesn't turn on when the thermostat calls for heat, it stays on all the time so I don't know if it's defective. I believe it comes on when you select a temp that is higher than the room temp and shows it's talking to boiler to get heat. So I am returning to see if it is defective. Update 11/18/19: I have received a replacement thermostat and installed it. The thermostat performed the same as the last one. I have found that once you turn the switch from off to heat, the flame icon stays on until you turn the thermostat off. The flame icon has nothing to do with the heater status. I sent a question to Emerson and have not got a response about the function of the flame icon. I am moving my rating to five stars as the thermostat is functioning properly and is a quality product that does exactly what it is supposed to do. I do hear a click as I raise the temperature above the room temperature, so I believe it functions just fine and keeps the temperature right at set temp. Update: I did not clip the 905 jumper as it suggests and this keeps room temp right at set temp without overshooting the set temp. It is very easy to clip the jumper if you decide to.
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Reviewed in the United States on November 13, 2019 by Stephen Arlaud
What a great thermostat for an RV
This product changed my mind about digital thermostats. I always liked bimetal spring based thermostats before trying this one. After all, those are passive, no batteries required, and they work on physics principles. What could go wrong? The answer is plenty! The one in my RV had sticky contacts. What I mean is the electrical contacts seemed to stick together. That resulted in a terrible problem, which the digital thermostat has solved completely. The problem was the temperature would have to drop way below the setpoint to get the furnace to turn on. Then, when on, the temperature would have to rise way above the setpoint before the furnace would turn off. This was awful. In a small RV there was no consistency in the temperature at all. It would swing widely above and below the desired setting. Plus the temperature control only had two options, ie warmer or cooler -- no actual temperature selection. This digital thermostat is absolutely one of the best upgrades I have ever done to my RV. 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. I am thrilled with this precise control. This is saving propane, which saves me money. Plus, I love the backlight. Now I can see the temperature and the setpoint even in the middle of the night. This digital thermostat runs on two AAA batteries. I put Energizer Ultimate Lithiums in it. Those should last 2-5 years before needing replacement, they never corrode, and they are imperviousness to temperature variations. This inexpensive digital thermostat is an excellent upgrade for an RV and it has changed my opinion of digital thermostats in general. I strongly recommend this, especially if you have an old analogue thermostat in your RV.
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Reviewed in the United States on November 29, 2023 by Dr. G
Easy install, easy to use, truck camper upgrade.
Quick upgrade for Travel Lite truck camper thermostat. Original was VERY difficult to switch on or off. This replacement has three simple buttons - On/Off, and Up and Down to set your desired temperature. An added feature that I really love, is that the digital screen I am sorry shows you the temperature inside, before you ever turn on the furnace. The unit itself has two AA batteries so the digital screen is self powered and does not drain your house battery. (A similar digital temp gauge I have runs years on two batteries.) Once you turn the furnace on, the screen will show you your set temperature and the current inside temperature. Do yourself a favor - skip those replacement thermostats with lever switches and get this digital Emerson. Install took five minutes and a phillips head screwdriver, just two wires.
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Reviewed in the United States on March 20, 2026 by Terri Miller
RV thermostat upgrade
Replaced the old OE heat only thermostat in our RV with this. It works much better than the old one. Easy to install and use. I like the display shows current temperature. Very simple to operate. It does need batteries which are included along with mounting hardware if needed. The instructions cover different models so be sure of the model when installing. I purchased this based on another RVers review and recommendation. This is working properly on our RVs 12 volt system. A much better t-stat than the original. Compared to the OE thermostat, this is an excellent value even if it is a few bucks more. It works better and looks better. Again, it does require batteries. Well worth considering
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Reviewed in the United States on September 1, 2026 by K. B.
So Far, So Good!
Works perfectly even on a Millivolt system( floor furnace ). I love the digital control over my last Honeywell thermostat. The temperature stays constant now hence no need to be playing with the thermostat setting all day! The Honeywell thermostat I had was flawed I think intentionally to sell more thermostats because no engineer in their right mind would design a thermostat with set of contacts that suffer from bi-metal corrosion increasing the resistance which made it fail just slightly after one year of usage! Just a heads up, when you buy your thermostat, test the relay contact resistance before installing! The standard resistance reading for this particular thermostat should fall between 0.3 - 0.4Ω. Some people are selling used thermostats and taking advantage of unsuspecting buyers! I've tested some that measured between 2 - 7Ω and that means the relay contacts are corroded and not making a good enough connection to even work with a millivolt system. Here's how you test your 'new' thermostat to see if it is actually new and that you haven't been scammed! Just grab a digital millimeter and set it to OHM and install two temporary wires onto the two screw terminals on the right hand side of the thermostat. Make sure you solder the ends of the stripped wire to keep them from corroding which insures the lowest resistance reading possible! Flip the thermostat switch into "HEAT" mode and install the batteries. The thermostat should now be powered on and displaying a temperature. Next, increase temperature setting till you hear the relay click closed. Now make your measurement across the two wires you just installed and if reading is higher than 0.3 - 0.4Ω then box it back up, return it for a replacement or refund. Also, if you have to make a wire splice on a millivolt system because you're existing thermostat wires don't reach the screw terminals. Solder all your new connections together to achieve the lowest resistance possible especially if you're dealing with a millivolt system. If you're still having issues then I'd advise you to check the amount of millivolts the thermopile is putting out! Even a new thermostat would solve the problems that a weak thermopile or pilot flame issue causes so just be aware of that fact before you go blaming it on the thermostat. Hope that helps and good luck with your repair.
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Reviewed in the United States on December 25, 2025 by Weaver Cattle Company
Great Thermostat for oil heat Furnace
Very easy to install for a heat only system. Works exactly as it should now my furnace will work more efficiently. Very durable construction that is compatible for my heat only system. With a low price point. Compatible and controls are easy to use. +++++ product
Reviewed in the United States on January 12, 2026 by franklin koch
Cheap and easy upgrade thermostat.
Easy hookup, easy to read and use. Wish it did have a backlight so you can read it at night time. Definitely a value of compared to an old-fashioned slide temperature thermostat. Easy to use to raise and lower your temperature. Simple and easy to install. Had a done probably within 5 minutes.
Reviewed in the United States on February 15, 2026 by Jeff Mc
Good Product
Have only had it installed for a few hours. Echoing almost everyone else, the directions are terrible but installation is a snap. If you need help, other reviewers tell you all you need to know. Also, one of the answered questions above points out a very helpful tip that is short enough for me to repeat here. There is no backlight by default but it can be activated through a simple procedure. Press the up and down buttons at the same time. The display will change to blinking between two different codes. Press the up button and the display will change to "on". Now move the physical switch from "heat" to "off", then back to "heat". Now every time you adjust the temp the backlight will light. 10/6/19 - Have had the thermostat installed for 10 days now. I'm very happy with it. It's simple, looks good, is inexpensive, and seems to have excellent temperature control. Turn it up one degree and the heat kicks on until the desired temperature is reached. I should have upgraded a long time ago. The backlight feature is invaluable when the room is dark. I don't know why they don't configure it that way straight from the factory. I'm keeping the 5 stars.
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Reviewed in the United States on October 27, 2019 by Hink