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

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.

Replaced old style RV thermostat with this one. Just be aware that the thermistor is on the inside so it takes a while for the temperature to stabilize. Otherwise much easier to use and control temperature.

I used this to replace the standard model in my camper. After replacing the gas valve I was still having issues and this fixed it. Simple install and exactly what I was looking for.

Thermostat works as it should. Was easy to install in my RV AFTER I googled the instructions. I’m deducting one star because box was open and no manual was included. I suspect I was shipped an open box item.

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.

Saw this in numerous camper videos when I purchased my 17JG and was the first item I replaced. Great decision as it works well and there's no guess work as to the temp.

Easy to install and seems very accurate. I haven't used it with the heat yet...it's over 90 degrees here each day in FL...and I won't be able to really use it until the fall but I have compared it to another thermometer I have and the temperature is very accurate. I ran the AC in the camper to get it nice and chilled and then shut it off and turned on the heat and it kicked on like it was supposed to. If it doesn't work, I will update this review in the fall but I think it will just fine. It's way better than the standard slide and guess thermostat that came with the camper for sure!