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

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

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.

Perfect for my Grooming van. Swapped out older analog for this newer digital. You connect either wire to RH and W and remove the wire bridge. I had to read reviews to figure this out because directions are sucky. Same would apply for any older unit with only 2 wires for a propane heater in their rig. Works great otherwise

Replaced rv suburban ts 12vdc and works great. Digital and more modern. Only disappointment is as used, the backlightimg does not work as the advertised picture shows. Ah well try to find a manual online."backlight option. To turn it on, press both temp up and temp down buttons for a few seconds and choose “on”. To return to standard temperature display turn the thermostat off and then back on to heat." Maybe other configurations like heat anticipator.

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.

Very good company to deal with. I had problem and they sent a replacement that arrived overnight . Can not ask for better service . The thermostat works well and was easy to install .

no problems with simple hook-up for furnace (Bryant) WORKS just fine

It was easy to install and manual was easy to read. It fit perfectly in the spot where the old one was. It was easy to use to set your temperature you want. It’s built was good hit it couple of times never broke. I’m happy with it and bonus i now can see what the temp is in my camper.

Very simple to installed in place of the previous one that broke. And works perfect !!! Very happy

Excellent product

I've purchased three of these units over the last 3-4 years. They all work perfectly. I have them controlling my propane fireplaces and at the cottage my propane heater. Never had a problem with any of them. They look good and are easy to read. I would recommend this unit for any low voltage, heat only application.

My house has an old (as in 60+ years old) hydronic boiler heating system with millivolt controls. Over the years I've replaced the thermostat twice before and now my thermostat was giving me trouble, so I decided to replace it. All the 3 different models of thermostats we've had over the years, none has been able to keep the temperature inside our house constant. After reading reviews of several products, I decided to get this thermostat. Installation was easy but the instructions aren't great (hence the 4 stars instead of 5). When I installed it, I connected the black and white wires, and I cut two jumpers as per the instructions: (1) jumper W904 to change the display to degrees C, and (2) jumper W905 to tell the thermostat the heating system was hydronic. Installation took less than 10 minutes. The thermostat has now been installed for a week. During this week the temperature outside has varied from +4 °C to -21 °C yet the temperature inside our house has been constant at its setting of 21 °C. Keeping the temperature constant was something none of our previous thermostats could do with our heating system. I can't speak about the thermostat's suitability for other types of heating systems but for an old hydronic boiler system, this thermostat seems perfect! Update: After 2 years the thermostat still controls the temperature properly but the temperature increase/decrease buttons have stopped working. Consequently, I've downgraded my rating from 5 stars to 4 stars.

Simple I stall works perfect. Perfect match for the napoleon one I got with my fireplace, so I just snapped the new faceplate on!