Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire Zoom
  • 360° View

Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire

SKU:A3030101

Brand: Uponor (Wirsbo)

Uponor (Wirsbo)
Qty Price
$54.25
/ each
$209.40 / box (4 units x $52.35)
In Stock! Ships in 24-48 Hours
(107 Available)
0

Resources

Specs

Application: Heat Only
Stages:
?
1 Heat
Programmability: Non-Programmable
User Interface: Push Button
Mount: Vertical
Power Method: Hardwired
Operating Voltage: 24 VAC +/-10%
Voltage:
?
Low voltage
Wiring: Two-Wire
Color: White
Height: 5"
Length: 2.72"
Depth (Inches): 0.91"
Max. Load: 1.3A at 24 VAC
Display Range: 32 to 99°F
Resolution: 1° Displayed
0.25° Calculated

Description for Uponor (Wirsbo) A3030101

  • When it comes to radiant heating systems, not just any thermostat will do. That's why professional installers choose Wirsbo Radiant Thermostats. They are the first thermostats designed specifically for radiant floor heating.
  • Why a special thermostat for radiant floor heating? The dynamics of a radiant heating system differ from typical baseboard or warm air heating systems. Radiant systems always heat objects and mass, and need to be addressed differently than conventional thermostat logic.
  • The Wirsbo Thermostats offer two different control methods to handle this condition--differential and pulse-width modulation. Differential--When the measured room temperature falls 1F (0.5C) below the desired room setting, the control devices wired to the thermostat turns on.
  • Pulse-width Modulation--When the condition exists where the room temperature is 1 to 3F (0.5 to 1.5 C) below the room setting, the thermostat manages the on-and-off cycle using pulse width modulation. The on-and-off times vary depending on the difference between the room and set temperatures. The farther away the room temperature is from setpoint, the longer the on time. This prevents the room temperature from rising above the set temperature. The heating system runs continually at room temperature differences greater than 3 degrees F below setpoint.
  • These thermostats also feature digital filtering. This means that the thermostat measure the room temperature continuously. The thermostat's sensor detects even the smallest change, making it better able to react to a room's changing conditions. If all the room's temperatures were displayed as they are sensed, the temperatures shown would appear erratic and inconsistent. Filtering works by averaging the sensed values to ensure a smooth operation and display.
  • Wirsbo offers three thermostat models: Heat Only (A3030101), Heat and Cool (A3030102) and Heat Only, Three-wire (A3030103). The Heat Only (A3030101) and Heat and Cool (A3030102) thermostats are designed to operate in heating mode over two wires. These types of thermostats obtain their power for operation from taking voltage from the connected wiring. Different from other industry power-sharing thermostats, these eliminate any need for a third wire or battery, which makes the thermostats simple to install, wire and service.
  • And for those times when the two-wire thermostats aren't appropriate because of incompatibility with some third-party devices, Wirsbo also offers the Heat Only, Three-wire (A3030103).
  • No matter which thermostat you use, when you're selling radiant, you're selling comfort, The Wirsbo Radiant Thermostats feature special built-in software that provides the ultimate control that standard thermostats--when used with radiant heat--simply cannot. There's no overshoot, no undershoot--just constant, even comfort. Your customers will love the distinctive design and easy-on-the-eyes readout. But most of all, they will love the true radiant comfort only Wirsbo Radiant Thermostats provide!

Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire

REVIEW SNAPSHOT®

by PowerReviews
Uponor (Wirsbo)Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire
 
4.8

(based on 64 reviews)

Ratings Distribution

  • 5 Stars

     

    (54)

  • 4 Stars

     

    (8)

  • 3 Stars

     

    (2)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

98%

of respondents would recommend this to a friend.

Most Liked Positive Review

 

Very satisfied

I got these because one of our thermostats was acting up. A replacement was easily installed and worked well in the room which has been more evenly heated ever since. The result was so...Read complete review

I got these because one of our thermostats was acting up. A replacement was easily installed and worked well in the room which has been more evenly heated ever since. The result was so satisfactory that I ordered 4 more for other zones because it was obvious that the electronics. including the temperature sensor, had been changed from the originals which were installed in 2009. If you can use a screwdriver you can install this unit. Only a few minutes are required for installation. [...]

VS

Most Liked Negative Review

 

no backlight

Works great, but no backlight. In order to adjust the temp at night, yiou need to have a flashlight or turn on the room lights. Why would they make a thermostat without a...Read complete review

Works great, but no backlight. In order to adjust the temp at night, yiou need to have a flashlight or turn on the room lights. Why would they make a thermostat without a backlight?

Reviewed by 64 customers

Sort by

Displaying reviews 1-10

Back to top

Previous | Next »

 
5.0

Works Flawlessly

By Chad Clark

from Upstate NY

Comments about Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire:

I installed this thermostat about two weeks ago and it works great. Simple to install too.

I'm anxious to see if I'll see any savings in fuel usage. Eitehr way, the room is staying at a more moderate temperature.

 
3.0

Wirsbo Radiant Thermostat

By Nick

from Albany, NY

Verified Buyer

Comments about Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire:

Directions make you believe you cannot install it yourself...

 
5.0

The Wirsbo thermostat met my expectation

By Good Neighbor

from Stone Lake, WI

Verified Buyer

Comments about Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire:

Used in a hydronic system and meets requirements.

 
5.0

Excellent product just what I wanted.

By Pepe

from Hayward WI

Verified Buyer

Comments about Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire:

Easy to setup and easy to run.

 
5.0

Nice to find EXACT replacement

By "Chief"

from Arlington, WA

Verified Buyer

Comments about Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire:

It was a drop-in, exact replacement for the unit that failed after 12 years had elapsed. I have multiple zones so was able to "rob" one from another room until the new one arrived. I actually ordered two, so a spare would be on hand in the future. Help from the Tech Support area was superb...the person on the other end of the phone made several calls to Uponor to double check some parameters and called me back twice when he said he would. This is definately a JWD...."JOB WELL DONE"....Thanks Supply House!

 
5.0

Excellent product

By Roo Van Cleave

from Santa Fe, NM

Verified Buyer

Comments about Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire:

Easy to install and operate

 
5.0

great thermostat

By vin

from kingston nh

Verified Buyer

Comments about Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire:

i have radiant heat threw the whole house the other stat buy the time it got up to temp it over shot by 4 deg. with this one it stops and lets the heat catch up and never over shoots temp

 
5.0

Perfect so far

By Timthetoolman

from Ithaca,NY

Verified Buyer

Comments about Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire:

Nice looking simple quality thermostat. I expect it to be reliable, based on research. The pulse width modulation feature may save a little fuel while our in-floor radiant tubing continues to distribute heat. The only minor flaw for some would be that the display does not illuminate. I am more concerned with reliability, after having a few lighted popular thermostats fail.

 
5.0

Excellent

By Jam

from Westby, wi

Verified Buyer

Comments about Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire:

Simple product to control radiant system. Just what I was looking for!

 
5.0

This is a replacement & is excellent.

By Claude

from Central,N.H.

Verified Buyer

Comments about Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire:

The unit was 100% easy to program for max & min heat control temp on front of unit. Exactly what I need.

Displaying reviews 1-10

Back to top

Previous | Next »

Q&A: Ask the Questions, share answers

Do you have questions about this product?

Get answers from real customers and in-house experts with AnswerBox.

37 Questions | 57 Answers
Displaying questions 1-10Previous | Next »
  • Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire

    Q:

    I just installed the Wirsbo Radiant Thermostat and it seems to run constantly until it reaches the programmed temp and then it shuts down. I thought the benefit of this thermostat was that it would run intermittently (PWM) until it reaches desired temp.

    Is there something I need to do programming-wise?
    Asked on 2/3/2015 by Chad from Upstate, NY

    2 answers

    • VERIFIED BUYER

      A:

      It may look like it is running constantly when in fact is running intermittently once it reaches within about two degrees of the desired temperature. When there is more then about a two degree deference between the desired temperature and the actual temperature it will generally run continuously in order to reach the desired temperature more quickly. The little lines symbolizing heat radiating from the floor symbol (located on the display of the thermostat) only indicate that the thermostat is sensing that the temperature is below the desired temperature and not that the circulating pumps are constantly on. So, this symbol will be active for the entire time that the thermostat is sensing the low heat condition and not symbolizing that the circulating pumps are constantly on. Generally it will be cycling the pumps on and off when the temperature is getting close, and yet the symbol will be active until the desired temperature is reached.
      The two that I have installed in my house maintain the room temperature very well, and generally doesn't let the room fall more then one degree lower then is set for very long. If the thermostat senses that the temperature is continuing to drop it will turn the circulating pump(s) on for a longer duration. Depending on how fast the temperature is rising or dropping, the thermostat will regulate the on off time accordingly. The only true way to know the duration of the cycle when the thermostat is actively calling for heat would be to physically check the circulating pump(s).

      Answered on 2/6/2015 by Anonymous
    • VERIFIED BUYER

      A:

      I'm not an installer or expert but I have 3  of these in use for different applicatiins and all 3 operate the same way: when temp falls a degree or two below the setpoint they call for heat until you reach the desired temp.  Not sure why you would want it to run intermittently.  An infloor closed loop system is probably more efficient if it runs on a more continuous basis. 
      Sent from my U.S. Cellular® Smartphone

      Answered on 2/3/2015 by Anonymous
  • Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire

    Q:

    I have an approximately 20 year old Wirsbo thermostat (number on inside says 9845) that is not working. Can I replace it with this model?
    Asked on 11/20/2014 by Olivia

    1 answer

    • VERIFIED BUYER

      A:

      I did replace my old ones with this model and it worked although you need
      to make sure the current is the same. The wiring is a bit tedious but I
      suppose most items this small will be.
      Jerry

      Answered on 11/20/2014 by Anonymous
  • Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire

    Q:

    What type of battery is used in the heat only system?
    Asked on 11/9/2014 by Mike from Hagerstown, MD

    1 answer

    • CUSTOMER CARE

      A:

      This thermostat is hardwired and is designed to operate in heating mode over two wires. These types of thermostats obtain their power for operation from taking voltage from the connected wiring. These eliminate any need for a third wire or battery, which makes the thermostats simple to install, wire and service.

      Answered on 11/10/2014 by SupplyHouse Staff from NY
  • Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire

    Q:

    Is there any way to disable the freeze protection feature?
    Asked on 11/2/2014 by Ken from Evansville IN

    1 answer

    • CUSTOMER CARE

      A:

      No, the freeze protection feature cannot be deactivated. The automatic protection will engage the heating circuit at 38 deg. F. and disengage it at 39 deg. F.

      Answered on 11/4/2014 by SupplyHouse Staff from NY
  • Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire

    Q:

    Can this be wired to turn on 2 to 4 zones on with the one stat all zones are in the same "big open room". I have a brand new all "uponor" system btw...it would seem like a waste to have to buy 4 of these all for the same room...
    Asked on 10/1/2014 by atvalaska from alaska

    1 answer

    • VERIFIED BUYER

      A:

      Yes, you could control multiple zones with one thermostat, which would
      mostly make sense if all the zones were near the thermostat temp measuring
      point (which it sounds like this is the case). You will just need to
      connect all the solenoid valves for those zones in parallel, and connect
      them to a single control relay. The thermostat would then trigger the
      control relay (that how I have set my system up, but I used separate
      circulation pumps instead of relays since the pumps were nearly the same
      price as the relays). Hope this helps
      Rob

      Answered on 10/2/2014 by Anonymous
  • Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire

    Q:

    Is this thermostat compatible with a Taco SR504-EXP-4 switching relay control? If not, is there a way to make them work together??
    Asked on 4/15/2014 by pete

    4 answers

    • A:

      Yes, I had a problem of the thermostat constantly calling for heat. Spoke with an Uponor tech and was told that Taco changed some internal wiring in the SR504 exp. If there is a minute amount of voltage a resistor(included with the tstat) should be installed on the Taco effected tstat connection. the resistor should be installed between the "W" terminal and the "C" terminal on the Taco SR504

      Answered on 11/10/2014 by Wilks from NJ
    • CUSTOMER CARE

      A:

      They should be compatible, although you may need a 1k ohm resistor between the W and common connections.

      Answered on 5/2/2014 by SupplyHouse Staff from NY
    • VERIFIED BUYER

      A:

      Yes, it is. I have this thermostat connected to a Taco 3 zone relay and
      single zone relay in 2 different installations. No problem, super easy.

      Answered on 4/17/2014 by Anonymous
    • VERIFIED BUYER

      A:

      It will work just fine with it.

      Answered on 4/15/2014 by Anonymous
  • Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire

    Q:

    i have wisbro system and the original installation
    used Setpoint 501s thermostats. will this radiant thermostat
    (WT 1) work with the system , need to replace one of the original
    units
    Asked on 11/24/2013 by philip

    2 answers

    • VERIFIED BUYER

      A:

      I believe that it should work. It worked well for me.

      Answered on 11/27/2013 by Anonymous
    • VERIFIED BUYER

      A:

      I am not directly familiar with the Setpoint 501s, but it seems to sense floor temp in addition to air temp (4 wire).  The WT1 is a 2 wire stat sensing air temp only, so it would seem to have less functionality.  I would recommend replacing the 501s with another 501s--these radiant systems are fussy enough without introducing other variables. 

      Answered on 11/24/2013 by Anonymous
  • Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire

    Q:

    I am installing Joist Trak for an underfloor radiant system and am wondering if this thermostat is a good idea? It seems that it is orientated more towards high thermal mass systems, not sure if it will work well with low thermal mass radiant systems?
    Asked on 11/19/2013 by Chad from Minnesota

    3 answers

    • VERIFIED BUYER

      A:

      I have used this and while it is simple it works well. It's an air temp
      thermostat, different from two others I have that are floor thermostats. I
      use it in a mixed application, as the basement room it is in also has HVAC
      but when it gets cold, and I want to be in the room (my office) there is no
      problem with communicating to the radiant supply. Worth the price and
      simple to install. Of course you'll need the additional switch to
      communicate with the pump, but I liked it in the install as it is low
      voltage so I did not need to run full current all the way to the thermostat.

      Answered on 11/20/2013 by Anonymous
    • VERIFIED BUYER

      A:

      Any thermal mass can suffer from being shocked with too rapid rate of heat rise.

      Answered on 11/20/2013 by Anonymous
    • VERIFIED BUYER

      A:

      I think I have the same situation - radiant system stapled up under wood
      subfloor, then engineered floor above that. It has been running for two
      winters now and works fine.

      Answered on 11/20/2013 by Anonymous
  • Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire

    Q:

    Is there any way to connect these thermostats to home automation system? I would like to be able to set vacation temp on all at once. Would also like to be able to remotely control thermostats by WiFi or cell phone to return vacation setting to normal before I return home.
    Asked on 11/2/2013 by JP

    3 answers

    • VERIFIED BUYER

      A:

      I do not believe so it is a good thermostat but very simple one.

      Answered on 11/3/2013 by Anonymous
    • VERIFIED BUYER

      A:

      No, each is an individual setting per room area. No added wires to allow an automation set up. Power into it and power out to open and close the valve when temp setting is met.
      Charles Chambers
      Southwest Border Region
      DHS\CBP\OAM
      Albuquerque Office
      Via Blackberry

      Answered on 11/3/2013 by Anonymous
    • VERIFIED BUYER

      A:

      Not directly they are way too complex sampling system for radiant heat. The controller they are tied to might be able to tie into home automation system. Keep in mind if your using radiant heat you can’t just run it up and down without causing thermo shock. The thermostat have a logarithmic differentiation program built in to prevent this.

      Answered on 11/2/2013 by Anonymous
  • Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire

    Q:

    I just installed this thermostat. I have a radiant floor system. I'm unclear about the Differential Mode and Pulse Width Mode. I want to be certain it's in PWM mode rather than Differential mode. It currently has the default settings. So, is it in PWM mode? How can I be certain? Thanks!
    Asked on 10/8/2013 by LeeGrins from Montana, USA

    1 answer

    • VERIFIED BUYER

      A:

      The answer is both.
      The t-stat will be in PWM mode when the room temp is between 1-3 degrees below it's set point. This allows the t-stat to bring the temp up slowly to avoid overshooting the target. If the temp is 1 degree off, it will be in differential mode to quickly satisfy the demand. If it is more than 3 degrees off it will also be differential mode because it knows it has a long way to go to satisfy the demand. I have 6 of these in my house and they work well.

      Answered on 10/8/2013 by Anonymous
Displaying questions 1-10Previous | Next »

Do you have a question about this product?