0085267348553

Honeywell

Model RTH221B

Internet #203539508

Store SKU #805478

7-Day Programmable Thermostat

$21.87 /each
  • Simple programming for the entire week, up to 4 periods per day
  • Compatible with heating, cooling & heat pump w/o auxiliary heat
  • Easy to read digital display

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Product Overview

The Honeywell 1-Week Programmable Thermostat has a simple interface and offers one basic program for the entire week with 4 program periods. It automatically adjusts the heating or cooling of your home so you are comfortable when you wake up, come home or at any other time you prefer. Used as directed, it offers energy savings of up to 33%.

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Customer Questions & Answers

7-Day Programmable Thermostat
7-Day Programmable Thermostat

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This question is from 7-Day Programmable Thermostat
 
11 answers

Why can't this be used with baseboard heaters?

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Asked by
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January 9, 2014
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Asked by
Seattle, WA
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Home Improvement Profile: DIYer
January 19, 2016
Answer: 
WARNING!! IGNORE EVERONE WHO JUST BLITHELY SAYS "IT WORKS"! It's not that simple, and it could be very dangerous if you do the wrong thing. I have an EE degree, and HarryJ below got it right. You need a transformer to convert line voltage to 24V and a relay in order to use a low-voltage thermostat with baseboards. Furnaces have such devices built-in. Fortunately, you don't have to build your own. Such a Read More
WARNING!! IGNORE EVERONE WHO JUST BLITHELY SAYS "IT WORKS"! It's not that simple, and it could be very dangerous if you do the wrong thing. I have an EE degree, and HarryJ below got it right. You need a transformer to convert line voltage to 24V and a relay in order to use a low-voltage thermostat with baseboards. Furnaces have such devices built-in. Fortunately, you don't have to build your own. Such a device is commercially available. It's called something like a "Level Temp Silent Operator", and it mounts directly in a knockout in a junction box in which you bring the line from the service panel and the line to supply the baseboards. Look up 24A01G-3. Such a device is available on this website under "Thermostat Accessories". They are also available at just about any local electrical supply house. I have hydronic baseboards, and my previous operator just failed after 35 years of flawless service. Because it is likely that you will replace your thermostat a few times over the course of many years, I believe it is a significant safety feature to NOT have a line voltage line feeding the thermostat. Read Less
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Asked by
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January 9, 2015
Answer: 
This runs off 24 volts from a furnace or heat pump and baseboard heaters run off 120 to 240 volts
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Asked by
Manchester, NH
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January 2, 2015
Answer: 
We have hot water baseboard heaters and use this thermostat with no problem.
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Asked by
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December 10, 2014
Answer: 
you need a thermostat made for electric heat, this is low volt
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Asked by
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October 7, 2014
Answer: 
Baseboard heaters normally use line voltage (in other words 120 volts or 240 volts) all the way through the thermostat. Hot air and baseboard hot water systems use low voltage to control a relay that sits near the furnace. You could build a low voltage control with a transformer, a relay an electrical box - but it isn't the kind of thing that most people want to do. The advantage would be you can get Read More
Baseboard heaters normally use line voltage (in other words 120 volts or 240 volts) all the way through the thermostat. Hot air and baseboard hot water systems use low voltage to control a relay that sits near the furnace. You could build a low voltage control with a transformer, a relay an electrical box - but it isn't the kind of thing that most people want to do. The advantage would be you can get fancy programmable thermostats like this one - but there is some electrical knowledge needed and if not done right it can be dangerous.
For the vast majority of people buying the right thermostat for electric baseboard heat is the way to go. Read Less
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Asked by
Waterville, ME, USA
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April 14, 2014
Answer: 
It can you have to look on the back of it has a switch and for baseboard heaters it has to be on electronic not oil belive it or not but it does work I have it and have baseboard heating
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Asked by
Palm Springs, CA, USA
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March 4, 2014
Answer: 
uncertain
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Asked by
Post Falls, ID, USA
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Home Improvement Profile: Professional
January 24, 2014
Answer: 
This thermostat requires 24V to operate, we call this low voltage. Baseboard heaters are wired into 120V, this is what we call LINE VOLTAGE. So baseboards require thermostat that can handle 120 voltage.
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Asked by
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January 23, 2014
Answer: 
Yes this unit can be use with baseboard heaters I bough one for a customer ,but she said that this unit was to hard for her to change the settings It really isn't that hard to do but she was not satisfy , so she went back to the old round Honeywell. Well You can't win all the time Really it is a good unit and simple to set up. I recommend this unit specially for small homes and apartments.
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January 17, 2014
Answer: 
The Honeywell RTH221B is rated for low voltage. Most baseboard heating systems are line voltage.
To confirm what thermostat replacement options there are, please call the Honeywell Consumer Technical Support Line at 1-800-468-1502. When you call please have information on the make/model of your existing thermostat, the voltage it is rated for and designation for each terminal that has a wire attached to Read More
The Honeywell RTH221B is rated for low voltage. Most baseboard heating systems are line voltage.
To confirm what thermostat replacement options there are, please call the Honeywell Consumer Technical Support Line at 1-800-468-1502. When you call please have information on the make/model of your existing thermostat, the voltage it is rated for and designation for each terminal that has a wire attached to it.
Sincerely,
Honeywell Customer Care Read Less
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Asked by
Post Falls, ID, USA
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January 14, 2014
Answer: 
Baseboard heaters require to be wired in to direct line voltage, 120V.
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This question is from 7-Day Programmable Thermostat
 
7 answers

furnace oil heating

This question is from 7-Day Programmable Thermostat
Asked by
Manchester NH
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December 27, 2013
I have forced hot water heat only and burn oil and i am looking to save 20% on buying oil what ius the best progmable thermostate avaiable?
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Answers (7)

Asked by
Manchester, NH
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January 2, 2015
Answer: 
Our forced hot water is fueled by natural gas and this works just great. Program it and forget it.
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Asked by
PA
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December 11, 2014
Answer: 
YES THIS IS MADE FOR THAT SYSTEM
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Asked by
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October 7, 2014
Answer: 
It depends on your life style. If you have a fairly regular schedule (get up, go to work, come home, go to bed) and are home two continuous days then a simple 7 day thermostat will work. The inexpensive ones have two settings - weekdays and weekends. They have worked for me for years. If you have a more variable schedule you might need something that allows you to program each day separately. All of them Read More
It depends on your life style. If you have a fairly regular schedule (get up, go to work, come home, go to bed) and are home two continuous days then a simple 7 day thermostat will work. The inexpensive ones have two settings - weekdays and weekends. They have worked for me for years. If you have a more variable schedule you might need something that allows you to program each day separately. All of them have the ability to override the schedule in case you are off for a holiday or your plans change.
The ones that have more days are generally not worth the extra money in my experience as there seems to be a big jump in price. Mine have lasted for many years with only a battery change every 4-5 years.
As to whether you will save 20% on oil, there are a lot of variables - but turning down the thermostat when you are not home is a big help. Read Less
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Asked by
Waterville, ME, USA
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April 14, 2014
Answer: 
Honeywell is a great product I saved $100.00 2months ago simply by installing it I even upped my temp to 72 vs 68 that I had it to prior I highly recommended it along with home depot I got it for $20 well worth the money
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Asked by
Frisco, TX, USA
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January 26, 2014
Answer: 
To obtain the savings that you need make sure that you get more than a basic programmable thermostat. You will want to be more in control of your times and temperature settings including the weekends. I recommend that you go to www.homedepot.com and look at the various models available and compare them before making your purchase. If not comfortable with that, just visit a store and I am sure you will Read More
To obtain the savings that you need make sure that you get more than a basic programmable thermostat. You will want to be more in control of your times and temperature settings including the weekends. I recommend that you go to www.homedepot.com and look at the various models available and compare them before making your purchase. If not comfortable with that, just visit a store and I am sure you will walk out with the product that you need. And by the way, highest price does not always mean the best product. And no I do not work for Home Depot. Read Less
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Asked by
Post Falls, ID, USA
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January 14, 2014
Answer: 
I would use a lower end to a mid level programmable thermostat. The higher end thermostats have such a close temperature range of heat an cool, that may cost you more fuel usage than savings.there are more issues to consider than just a thermostat.
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December 28, 2013
Answer: 
The Honeywell RTH221B is rated for low voltage and can be used on a variety of heating and cooling systems.
One of the keys to helping save energy is the use of a programmable thermostat. With that in mind there may be number of possible options for your application.
To determine which thermostat(s) may be compatible on your system, and has the features you want, the following information would be Read More
The Honeywell RTH221B is rated for low voltage and can be used on a variety of heating and cooling systems.
One of the keys to helping save energy is the use of a programmable thermostat. With that in mind there may be number of possible options for your application.
To determine which thermostat(s) may be compatible on your system, and has the features you want, the following information would be needed:
- The make/model of your existing thermostat.
- The voltage it is rated for.
- The letter designation for each terminal on it that has a wire attached to it.
Once you have that information, please call the Honeywell Consumer Technical Support Line at 1-800-468-1502.
Sincerely,
Honeywell Customer Care Read Less
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This question is from 7-Day Programmable Thermostat
 
4 answers

Can this thermostat be used with a heat pump system?

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June 6, 2014
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Asked by
CT
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January 5, 2016
Answer: 
Yes but i would not if you are talking Geo-thermal heat pump. If you are talking air-based heat pump you are fine.
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Asked by
Camden, Arkansas
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August 18, 2015
Answer: 
Yes it works with my heat pump system. It is compatible with gas heat also. It has a manual switch for AC and can be left at that position, until you need heat, it won't automatically switch from AC to heat.
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Asked by
Crystal River, Fl
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December 10, 2014
Answer: 
Yes it can.
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June 10, 2014
Answer: 
The Honeywell RTH221B can be used with a 24 volt heat pump system that does not have an auxiliary backup.
If you have further questions, please contact the Honeywell Consumer Support Line at 1-800-468-1502.
Sincerely,
Honeywell Customer Care
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This question is from 7-Day Programmable Thermostat
 
3 answers

Can this be used for central air conditioning control only?

This question is from 7-Day Programmable Thermostat
Asked by
Iowa
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June 13, 2015
I have separate central air and heating is the boiler/radiator. I currently have two separate thermostats. Is there a thermostat that can be used to control both? Or should I keep separate controls? I need to at least replace the ac thermostat with a programmable one, and wonder if this thermostat would work for the ac alone.
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Asked by
Camden, Arkansas
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August 18, 2015
Answer: 
It will work for the AC alone. It has a manual switch to make it work for either gas heat, or AC. In your application, you can just leave it set on AC, and then program it to your daily preferences
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Asked by
Mineral, VA
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August 16, 2015
Answer: 
Honeywell has a toll-free number to call: 1-800-468-1502; you can ask them.
Meanwhile, educated wild guess: you have two entirely independent systems, and I'm guessing you turn one or the other on as needed.
*IF* the wiring is compatible (the installation manual is available here as a PDF), you can probably set this thermostat to COOL (or OFF when not needed), and run just the cooling system.
Again, Read More
Honeywell has a toll-free number to call: 1-800-468-1502; you can ask them.
Meanwhile, educated wild guess: you have two entirely independent systems, and I'm guessing you turn one or the other on as needed.
*IF* the wiring is compatible (the installation manual is available here as a PDF), you can probably set this thermostat to COOL (or OFF when not needed), and run just the cooling system.
Again, I'd check with Honeywell to be sure.
*PROBABLY* using one thermostat to control both heating and cooling systems would require some additional circuitry between the thermostat and each system to sort out which system is being called.
Again, I'd check with Honeywell. Read Less
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July 1, 2015
Answer: 
Thank you for your recent inquiry with The Home Depot. The Home Depot cannot advise any customer of how to use the product purchased or will be purchased. It is to the customer’s discretion of how they use the product. However, any injuries resulting in improper use of product are not the responsibility of the Home Depot. Please be sure to read the instruction manual that comes with your product. For any Read More
Thank you for your recent inquiry with The Home Depot. The Home Depot cannot advise any customer of how to use the product purchased or will be purchased. It is to the customer’s discretion of how they use the product. However, any injuries resulting in improper use of product are not the responsibility of the Home Depot. Please be sure to read the instruction manual that comes with your product. For any other questions, please call us at HomeDepot.com Customer Service 800-430-3376. Thank you for shopping Home Depot. Read Less
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Customer Reviews

Rated 3.6 out of 5 by 117 reviewers.
Rated 1.0 out of 5.0 by No Does not work all that great but it does work I'll never buy another one likebthis August 2, 2016
Rated 3.0 out of 5.0 by No Back Light I'm not sure if it was the confusing instructions or the lack of my electrical experience but, I had to call out an A/C specialist to tell me that I blew a transformer during the install. Once that was repaired, it worked fine. BUT, to my surprise this thermostat does not have back lighting. I don't even won't to deal with the programming. I have to make sure that a light is on or have a flashlight handy to adjust the settings. I wouldn't recommend this product. April 19, 2016
Rated 2.0 out of 5.0 by It is not 7 day programmable It is not 7day programmable. It is 5-2 programmable. Specifications are wrong. April 12, 2016
Rated 3.0 out of 5.0 by Seems to be a good thermostat but doesn't meet my needs. I understood the on-line description to say I could set a program for each day. Unfortunately, the label on the package indicated I could only set one program which would be the same for all days. That's not what I need so I had to return the thermostats I had ordered. March 29, 2016
Rated 1.0 out of 5.0 by Poorly designed product The product is very poorly designed. The connector is so tight that required removal of the connector mate for installation results in the unit housing completely falling apart. To add insult to injury, the wiring diagram is confusing, at best. As an electrical engineer, I figured it out, but there is no way a novice could. I had to find documentation on line -- provided documentation was not adequate. Finally, the help line put me on hold for 30+ minutes and then I was disconnected. I would strongly suggest that Home Depot consider discontinuing this product. February 23, 2016
Rated 5.0 out of 5.0 by simple thermastat This is an easy to install thermastat for a simple non WiFi heating system. The temperature is programmable. March 22, 2016
Rated 4.0 out of 5.0 by Does the Job Wasn't happy that Honeywell was the only brand available because the previous one failed after only a few years. Needed a simpler solution because we didn't need weekends to be different than weekdays (we're retired) This one is easy to program - daytime temperature and setback at night. It did the job. We'll see if it lasts longer than the other one. Also disappointed that Honeywell is not consistent with its mounting holes. They should all be the same for ease of switching for any reason. Could be used as a selling point for future upgrades. January 19, 2016
Rated 5.0 out of 5.0 by thermostat the thermostat was Easy to install and easy to program plus very inexpensive December 10, 2014
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