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Honeywell RTH221B Basic Programmable Thermostat | 
| Brand: Honeywell
Category: Home Improvement
List Price: $29.99
Buy New: $21.50
as of 9/9/2010 05:51 EDT details
You Save: $8.49 (28%)
New (13) Used (1) from $15.99
Seller: prabidea
Rating:  47 reviews
Sales Rank: 2390
Color: White
Media: Tools & Hardware
Number Of Items: 1
Size: Large
Shipping Weight (lbs): 0.5
Dimensions (in): 1.8 x 6.5 x 8.8
MPN: RTH221B 1000/A
Model: RTH221B
UPC: 085267311779
EAN: 0085267311779
ASIN: B000WEKNOW
Availability: Usually ships in 1-2 business days
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| Features:
| • | Sleek one piece design. All control buttons on face of the product with a display that shows current and set temperatures. | | • | Precise temperature control of +/- 1 degree F | | • | Basic One Programmable with 4 programmable periods per day | | • | Vertical positioning for easy upgrade from standard manual thermostats | | • | One touch hold |
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| Editorial Reviews:
Product Description
One program with 4 program periods per day. For use with central gas, oil or electric furnaces and AC. For millivolt systems. All control buttons on face of the product. Soft touch buttons, one touch hold. Precise temperature control (+/-1 degree F).
Amazon.com Product Description
Offering the ease and reliability of basic programming, the Honeywell RTH221B One-Week Programmable Thermostat can help save money on your energy bills--without sacrificing your comfort. Featuring a sleek one-piece design that blends seamlessly with any decor, the RTH221B is compatible with most heating and cooling systems. |
RTH221B One-Week Programmable Thermostat
At a Glance:- Basic operation keeps programming easy
- 4 program periods per day
- Precise temperature control of + /- 1 degree
- For use with central gas, oil, or electric furnaces and AC
- 1-year warranty
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Using a programmable thermostat is one of the easiest ways to reduce energy costs. |
Precise, Programmable Temperature Control
The RTH221B lets you control the temperature inside your home, even when you're not there. In just minutes, you can create one simple program that will run for the entire week, with up to four program periods per day (wake, leave, return, and sleep).For further convenience, the RTH221B gives you precise temperature control plus or minus one degree Fahrenheit, so you can create the atmosphere that's perfect for you. Save up to 33% on Annual Heating Costs
Using a programmable thermostat is one of the easiest and least expensive ways to reduce energy costs and protect the planet--without sacrificing personal comfort. By creating a program that automatically adjusts the temperature during times when optimum comfort is not necessary (e.g. when you're sleeping or away from home), you can significantly cut down on your overall energy usage and reduce your monthly bills. In fact, depending on your geographic region and usage patterns, the RTH221B can help you save up to 33% on annual heating costs. User-Friendly, One-Piece Design
One of the RTH221B's key advantages is its user-friendly, one-piece design. All control buttons are visible on the front of the unit for quick and easy accessibility, and the display clearly shows current and set temperatures. Soft-touch/one-touch hold buttons keep things simple, while vertical positioning makes for an easy upgrade from standard manual thermostats. Compatibility and Warranty Information
The RTH221B works with central gas, oil or electric furnaces, AC, and millivolt systems. It is not compatible with multi-stage heating/cooling systems, heat-pump systems, or electric baseboard heat (120 - 240 volts). The Honeywell RTH221B One-Week Programmable Thermostat and is backed by a one-year warranty. What's in the Box
Honeywell RTH221B One-Week Programmable Thermostat; mounting hardware; warranty card; and manual.
| COMPATIBILITY | | 24-VOLT HEATING AND AIR CONDITIONING SYSTEMS | | Single-Stage Heating and Cooling |  | Multistage Heating and Cooling | | | Heating Only |  | Cooling Only | | | Furnace (Warm Air) | | Central Air Conditioning | | | Heat Pump without Auxiliary Heat | | Heat Pump with Auxiliary Heat | | | Hot Water | | Steam or Gravity | | | 750 Millivolt | | Gas Fireplaces
(24 Volt or 750 Millivolt) | | Electric Baseboard Heat
(120 - 240 Volts) | | | |
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| Customer Reviews:
Showing reviews 1-5 of 47
 A good simple thermostat December 21, 2007
Miles H. Kennedy (Cleveland, Ohio)
41 out of 43 found this review helpful
My wife and I are both retired so every day is a 'weekend day'. Most thermostats require multiple settings for different kinds of days. Good idea if you're a worker but bad idea if you're me since going on vacation etc requires MULTIPLE thermostat adjustments. Also, why pay extra for annoying unused features. This thermostat is simple, easy to install and has typical Honeywell accuracy and reliability. For me it's ideal.
Works well July 6, 2008
D. J. Tanzer (Phoenix, AZ USA)
19 out of 19 found this review helpful
Basic programable t-stat. Works well, easy to install Honeywell is a good brand. **HOWEVER in picture on amazon the screen on it looks back-lit, but it is not lit.
Best money I've spent in a long time March 17, 2009
Nature Gal (Illinois)
15 out of 16 found this review helpful
I bought this thermostat this fall from a big box home improvement store and it's paid for itself several times over in a few short months (and I paid more than the listing price on Amazon).
I had never installed a thermostat before, but it was a breeze to install. I turned off the breakers to my living room, carefully removed the old thermostat, attached two wires, installed a couple of screws (I think that I ended up drilling one new hole), and turned the power back on. Less than 15 minutes from start to finish, and I'm not the handiest gal you'll ever meet. It worked. I set it to turn down at night while we're sleeping and during the day when we're gone. I also put the plastic on the windows, but other than the new thermostat I did nothing different this year than last.
February 2008- the portion of our utility bill for natural gas was $188.03. February 2009, with the average temperature just 4 degrees warmer, our natural gas bill was $88.08. We have saved at least $40 every month since I installed it. It's paid for itself several times over. It's probably the best thing I've purchased in a very long time.
Honeywell RTH221B February 14, 2009
Cassius Dio (nyc)
6 out of 6 found this review helpful
This is a great product for those looking to replace their older, vertical style, mercury-filled thermostats.
Installation was a breeze, as was the programming.
An earlier reviewer reported problems with the accuracy of the temperature measurement in their units, but both of mine were dead on, as far the measured accuracy of the room temperature is concerned.
One of the best things about digital thermostats (besides their being programmable) compared to their mechanical (bi-metal coil) brethren, and one that I noticed right away, is how constant they keep the temperature in a room - they do not allow wild fluctuations, down or up, to an uncomfortable level. You simply do not notice their work, and that's a good thing.
Overall, this is probably the best twenty (x2) bucks I have spent for my home.
Excellent Basic Programmable Thermostat March 1, 2010
Ike Bike (Seattle, WA)
3 out of 3 found this review helpful
I can't believe I waited so long to replace the old mercury bubble thermostat on my hot water heat system. I noticed a friend had a new one, so I decided it was time to do some research here at Amazon.
I wanted a vertical style to match the placement of the old one which narrowed the field considerably. I wanted a simple day/night setback and didn't need separate settings for weekends. I wanted simple controls and ease of temporary adjustment. This one fit the bill perfectly.
Installation was a breeze. The instructions are clear and easy to follow. My two-wire system connected to the Rh (Red - heat) and W (White) terminals. The wires weren't that color (probably the original 90 year old wires!) so I either guessed right or, more likely, it would have worked if they were reversed since it's simply an open/close switch to activate the heater. I even reused the mounting screws from the old unit - sweet! Stop by your local Dollar Store and pick up a mini screwdriver set if you don't have one.
Programming is straightforward, and again the instructions are clear. It comes preprogrammed with four periods - Wake, Leave, Return, and Sleep. It's easy to adjust these to your desired time/temp. I skipped two of them completely by simply pressing the Hold button for four seconds while that period was displayed during setup. Believe me, you'll be tweaking your settings with abandon after the first run-through... it's that easy.
I love the simplicity of the display. What's the current temp? Look at the screen. You're a bit cold? Tap the up arrow once and read the setpoint; tap it again to temporarily raise the setpoint one degree, again for two degrees, etc. The unit will retain your temporary setting until the next programed change (e.g. night setback) or until you press the Run button. Going away for a couple of days? Tap in the desired setpoint and press Hold. Simply press Run again when you get home. As noted in other reviews, there is no backlight in the display.
You can download the installation and user's manual at the Honeywell website to get a peek at how it works.
Be sure to note the Configuration Menu in the installation instructions. I had to change the "Heating Cycles per Hour" setting to "3" (for my hot water system) from the default "5" setting.
What is Heating Cycles per Hour, you ask? It's a means to fine-tune the efficiency of the system's attempts to maintain your desired temperature. It's ONLY active when you're within a degree or so of the setpoint temperature. Here's how it works:
Say, your setpoint temperature is 70°. As the heater brings the room air temp up towards the setpoint, an anticipator circuit cuts off the heat at a predetermined value, say 69° to keep from overshooting your requested 70°. Ideally, the residual heat from your burner/blower/fan/radiator will gently nudge the air temp up to 70°, and all is right with the world. So far we have: temp below 69°, run heater; temp above 70°, stop heater. But what happens between 69° and 70°? What if there wasn't enough residual heat to get to 70°? Or what if your furnace isn't sized properly, or your insulation is weak, or the kids left a window open? Where's that 70° you requested?
This is where you heater starts cycling. My "Cycles per Hour" is set to 3, which means 3 twenty minute cycles each hour consisting of 10 minutes OFF, 10 minutes ON. When the air temp hit 69° the heater stopped for 10 minutes, hoping the air temp will reach the magic 70°. 10 minutes later it takes a peek at the temp... 70° or above? Great! Job done. No cycling involved. Oops - only 69.3°? - start up again for 10 minutes, shut down, wait 10 minutes and check again. 69.8° this time? Start up again for 10 minutes and another cycle. This time, let's say the temp hit 70° after 8 minutes of heat. Great! - job done, shut off heat and stop cycling. It might overshoot to about 70.3° this time - well within your comfort zone. Now, sit warm and cozy in front of the TV as the temp slowly falls from 70.3° to 69° and listen for the cycling to begin again. If you're well insulated, it's a fairly mild night, and your heater is sized properly, it might go through a cycle every couple of hours. If there's a blizzard blowing outside your poorly insulated shack, it might cycle on and off every 10 minutes, or even stay on constantly if it can't get you above 69°.
To recap: Temp below setpoint minus one: heater ON. Temp above setpoint: heater OFF. In between: cycle ON and OFF in attempt to efficiently get to setpoint without too much overshoot. Why? A heater is more efficient running longer cycles rather than rapid On/Off cycles. A heater with a lot of "thermal inertia" - like my hot water system, takes a while for those warm radiators to gently get the air temperature to the desired setpoint... it needs cycles a bit longer to be efficient and effective. A rapid heat system, like an electric wall heater, will get that air temp up quickly - it needs a higher cycle rate / shorter 'burn' time to stay efficient and avoid overshoots. In fact, the cycle rate for electric heat is 9: that's 9 cycles of 6.7 minutes per hour.
Air conditioning cycle/hour is fixed at 3.
One more thing: if you want the fancier model, the Honeywell TH2110D1009 is the same unit, but with backlight, 5/2 day programming, and something called "Adaptive Intelligent Recovery" which learns how fast your heater gets you to your desired temperature so that you can program it to BE at a given temperature at a given time... handy for those early morning middle-of-winter wake ups!
Be sure to properly dispose of that mercury!
Enjoy!
Showing reviews 1-5 of 47
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