HOME CT33A1009 Economy Non-Programmable Thermostat - Millivolt Heat Only

This arrived in full retail packaging, which is what I would expect from a brand the size of Honeywell. Everything needed for installation was included, including the mounting fasteners. Nothing was missing or damaged. I tested this on the bench for about a day before installing it, just to confirm operation. It worked exactly as expected. This is a very simple thermostat, and there is not much that can go wrong. The temperature switching was consistent and predictable during testing. Since this is an old school manual control, the reported temperature seems about as correct as I can tell. Based on prior experience with this style of thermostat, they are generally pretty accurate, but it is hard to ever know or prove exactly how precise they are. There is no fine-grain scale for setting or reading temperature, so you are working within a reasonable range rather than dialing in an exact number. This thermostat does not use any batteries. Because of that, there is no display brightness adjustment or extra configuration options. The only setting is the temperature where it activates the heat. Depending on how you want to look at it, the battery life is eternal, immortal, or infinite since there are none to replace. There are a couple of things worth noting. There is no dedicated button or lever to override the temperature setting and force the heat fully ON or OFF. If you want to do that, you need to slide the mode switch each time, or wire in your own external bypass if your setup allows it. Also, do not forget to open the cover and remove the cardboard insulating piece that prevents contact during shipping. If you skip that step, it will not function and may look defective at first. In my video, I show the switch operating several times to confirm proper operation. It would be very difficult to beat this value. You get a well-known brand name, warranty support, no batteries required, and an inexpensive price point. Overall, this is a basic, no-frills thermostat that does exactly what it is supposed to do and represents a very good value.

My gas fireplace insert wasn’t working. After doing some trouble shooting I figured out that the old mercury thermostat on the wall wasn’t working. This one was cheap and it took about 10 minutes to get it replaced. Fireplace works perfect now.

This thermostat is working great for my cozy wall furnace !!!!!!!!

Nothing fancy, was relatively easy to install and worked as expected.

Worked perfectly on my old house heater and was easy to set up. The fact that it needs no batteries is a plus since I would probably forget about them.

It's hard to imagine how they could have designed a worse user interface for this useful device--maybe if it were completely invisible? I've made several attempts to stick post-its with lines and temperatures over top of the imprecise calibrations that are painted on the front of unit, but the pointer is too fat, and too far behind the front of the unit which casts a shadow on it, and open on the top which allows my finger to cast a second shadow on it as I adjust it. Like the Mona Lisa's eyes, depending on where I hold my head, the indicated temperature changes quite dramatically. The upshot is that setting the temperature to 68 vs 70 vs 75 is a variable guessing-game. Next, I will try bulking up the indicator with a piece of cardboard that brings the indicator closer to the front and drawing a thin line, then resetting my paper scale. And then I'll add some sort of top cover so that the shadow of my hand can't fall onto the pointer as I set the temp. All that said, it quite responsively turns the furnace on and off the instant I ask it to. So it's better than what I had before, which was a "smart" (i.e., bossy and high-maintenance) thermostat that required that 4 times per day, 7 days per week be individually set, AND even on manual/hold setting only turned the furnace on when it felt like it, not when I asked it to or when out of range of the set temperature. So at least I'm not cold. :)

Worked perfectly for our 02 Lance camper.

Doesn't work. Horrid instructions. Bad product. How does anyone stay in business when they care this little about their product and their customers?

Works great and easy to install

Works great on my gas fire place

Easy to install and works like a thermostat is supposed to work.

Worked great for my older gas space heater.

Works good I’m totally happy with it