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I replaced one of the old round bi-metal spring thermostats with the Honeywell RTH111B. The Honeywell works great and keeps the temperature where I set it. It has no "bells and whistles" as you'd expect for the price. Only thing I did not like is that the slide switch for Heat-Off-Cool is quite small and it's not always obvious at which position it's set.Best Deals on Honeywell RTH111B H/C Digital Manual Thermostat
I purchased this non-programmable thermostat to install in the portion of my two-family home that I rent out. I also purchased the similar Honeywell RTH221B Basic Programmable Thermostat programmable model for my own portion of the residence. Installation of both models is identical, and the main difference between the two is just the ability to set up a program of varying temperature changes based on your schedule. The non-programmable RTH111B has no clock feature. Just simple buttons to change the temperature up or down, and switches for a system fan (if applicable) and the HEAT-OFF-COOL selection.The apartment that received the RTH111B is a simple heat-only gas powered baseboard system. The installation instructions were generally easy to follow, but I also found additional information on the Honeywell website explaining what each terminal actually was. It would have been useful for Honeywell to print this in the instructions. Summarized:
Rh : Heating power supply
Rc : Cooling power supply
W : Heating signal
Y : Cooling signal
G : Fan
The two heating systems in my home are both ONLY heat, and have a two-wire connection. The wiring looked about a hundred years old, but still worked perfectly once I connected the wires to the Rh and W terminals. Interesting to note that in both installations it did not seem to make a difference which of the two wires went to what terminal, so long as it was Rh and W. However in a more complicated system that includes more wires for cooling or a fan, I'd use the included labels to mark each wire and be certain it was connected properly.
I don't have any dollar amount savings to offer, but I can say that the temperature was MUCH more consistent in my apartment than it had been with the old round-style mercury switch which was prone to large temperature swings. There is no question in my mind that less fuel was used, and it's very likely that the two thermostats I purchased have already paid for themselves one month later.
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I purchased this unit as a recommended 'garage thermostat'. I installed it for sporadic operation of my garage heater, during the winter in North Dakota. Needless to say it gets cold here, which is why we need a heater. But I also don't intend to waste the power necessary to keep my garage above 40 degrees all winter so would only use this on occasion. Onto the design flaw that I still can't believe...This unit will literally not operate below 32 degrees. Going in, I knew it was only programmable down to 40 degrees, so it would not maintain a temperature of less, but since I only planned to use it sporadically, that wasn't an issue. The problem is, it won't even turn the heater on below 32. At all. I confirmed this was intentional design by Honeywell, which makes me seriously question the engineers they have designing their products. Not only that, they don't offer ANY thermostat without this flaw. Imagine, a thermostat for a heater that makes it impossible to heat because it's cold...umm...really? The old $3 Hg-filled manual junker I was replacing with this worked just fine below freezing.
Let's look at scenario 2: I lose power at my house for an extended time and it gets cold. When the power finally comes back, I can't turn my heater on to finally heat my house because the thermostat says 'nope, it's cold, no heat for you'. Honeywell's suggestion? Wait until it gets above 32 on its own, then I can run the heater...so basically, you can heat if it's already warm, but not if it's cold.
Sorry, a-returning this product will go.
Otherwise, if you're looking for this in a completely different application....The unit was easy enough to install. The directions weren't great, but they don't have to be. Any typical homeowner should have no problems. Unit looks good enough, and for the 5 minutes I played with it after install it worked well enough (I'd heated my garage so it actually worked for a few mintues).
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Nice basic digital thermostat.Manual heat/cool controls.
Manual fan control.
Digital adjustment of temperature that is accurate.
No backlight on ours, probably to save battery life.
Easy to install.
Great for replacing old mercury thermostats...please remember to dipose of mercury properly.
Easy to install, simplistic to use. Just select the desired unit, heater or aircon, then select the temperature. It holds within +/2° to 3°. No messing ... dthermostat.blogspot.com
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