Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire Zoom
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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
(130 Available)
2

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 55 reviews)

Ratings Distribution

  • 5 Stars

     

    (46)

  • 4 Stars

     

    (8)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

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 55 customers

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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.

 
5.0

Wirsbo Radiant Thermostat

By Drooler

from Stillwater, MN

Verified Buyer

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

Product shipped quickly and installed easily. I had the older style thermostat installed. This newer one has a smaller footprint so a bit of painting was required. I like the new model in that if power is lost it resets to last temperature setting. The older units (I have two more) reset to 70 degrees when power turns back on thus in the summer our heat would turn on after power failure. Thanks.

(1 of 1 customers found this review helpful)

 
5.0

Just what we ordered.

By Pearl

from Minnesota

Verified Buyer

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

Easy to install Working great so far.

(0 of 1 customers found this review helpful)

 
4.0

Simple is better

By lcgallo

from Woodside, CA

Verified Buyer

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

The problem I had with this product, that I badly wanted, was compatibility.
I am DY guy and could solve the compatibility problem of the WT 1 because I am an electrical engineer capable to provide the conditions that the WT 1 needed.
Previously I tried to use a NEST device and beside its intrusion in my privacy I was not comfortable in providing its needs to operate in my radiant heating system.

 
5.0

Got it fast and it works great!

By Steve

from Middle village , New York

Verified Buyer

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

Product is sufficient in every way

 
5.0

Works well

By RT

from Oregon City, OR

Verified Buyer

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

We have had infloor heat for 6 years that was controlled by an "on/off" thermostat. It was constantly overshooting the temperature mark and wasting lot's of propane. This unit works as described and the modulation keep the floor warm, not hot, and the room at the set temp. Simple to install and use.

 
5.0

Fantastic product

By Garden queen

from Minnesota

Verified Buyer

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

We recently changed out thermostats from the basic ones for forced air heat that were put in the house when it was built in 2008. These were by far so simple to install and program. Our radiant heat has never worked so flawlessly. I would definitely recommend to anyone installing the in-floor radiant heat.

(1 of 1 customers found this review helpful)

 
5.0

WIRSBO RADIANT THERMOSTAT

By DAVE

from NORFOLK,NY

Verified Buyer

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

VERY GOOD THERMOSTAT,BEING USED IN MY HOUSE WITH RADIANT HEATED FLOORS.

 
5.0

Updating the system

By hws

from Santa Fe NM

Verified Buyer

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

We live in Santa Fe,NM which has large swings in temjperature in a 24 hr period. The old thermostats had a 3 degree heating differtial and would not call for heat as the indoor temperature dropped more than 3. The readiant heat boiler would then play catch up, never really catching up and only shutting down when the solar gain warmed the house. These Uponer models have added a brain to my system, managing the temperature precisely witnin 1 degree. They also reduce the cycling.
I'm very pleased and highly recommend.

 
5.0

Wisbro radiant thermostat

By ralphie

from northern New Mexico

Verified Buyer

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

Controls zones of in floor radiant heating. Easy to install, seems pretty accurate.

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Q&A: Ask the Questions, share answers

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

32 Questions | 50 Answers
Displaying questions 1-10Previous | Next »
  • 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

    3 answers

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

    Q:

    I currently have 5 zones with Wirsbo T86H 3 wire radiant thermostats wired to an Advance Systems SR601 circulator switching relay controller. The system has pex tubing in lightweight concrete. The temperature mixing valve is manual – I have to set the water temp. low in fall and spring and raise it in winter. In winter, if we have a mild day, the room temp will overshoot. I see that the WT-1 is 2-wire and that the Wirsbo 3-wire A3030103 is no longer available. What options do I have to get a better thermostat?
    Asked on 7/4/2013 by Bob

    2 answers

    • VERIFIED BUYER

      A:

      Get an electronic mixing valve with outdoor reset.
      Sent from my iPad

      Answered on 7/4/2013 by Anonymous
    • VERIFIED BUYER

      A:

      The only way to prevent your overshoot is to install an automatic mixing valve with outdoor reset. This will adjust the water temp based on actual outdoor temp. Something like this would do the trick http://www.pexsupply.com/Taco-I075C3R-1-3-4-3-Way-Outdoor-Reset-I-Series-Mixing-Valve-w-Sensor-5203000-p

      Answered on 7/4/2013 by Anonymous
  • Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire

    Q:

    We turn down our heating in the bedroom at night.Does this unit make adjustments easily. Not concerned about recovery just ability to adjust desired temperture at will.
    Asked on 11/6/2012 by David from South Portland, ME

    3 answers

    • VERIFIED BUYER

      A:

      This is a very simple thermostat. And works very well.
      You have to be careful in using it as you have to remember that you are
      dealing with stored heat and it takes time to cool of a room as well as
      heating it up.
      The internals of this T-stat is designed for radiant heat

      Answered on 11/6/2012 by Anonymous
    • VERIFIED BUYER

      A:

      Yes, this product is extremely easy to adjust AND it is (in my opinion) as accurate as any thermostat on the market. However, as you probably already know, radiant heat systems do not respond rapidly to thermostat setpoint changes; that is to say, most radiant (in-floor) heating systems provide greater homeowner satisfaction if the setpoint is set and left alone....unless you're out of the home for a long period of time, at which time you would be advised to adjust the temperature setpoint to a more economical setpoint, as long as no one will be in the building. That being said, give the system adequate time to respond to the normal setpoint after your return. I hope this helps...

      Answered on 11/6/2012 by Mike from Colorado
    • VERIFIED BUYER

      A:

      Hi, sorry for the delay. These units are very responsive and I have had no
      problems in three years (I have four of them). The only thing I don't like
      about them is there in no on/off switch. We turn them all the way down in
      the off season (59 degrees) but if you get a 55 degree night and want to
      sleep with the windows open you get a heat call. I could just disconnect
      the 12V but our pump needs to periodically run so I just let it run. Who
      designs things like this and never uses them? Hope this helps.
      Todd

      Answered on 11/8/2012 by Anonymous
  • Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire

    Q:

    I have the WT 1 wirsbo stat installed in my 1200 sq ft building with 1200 feet of 1/2" pex, 4 loops, I have a 11kw boiler, it's a closed loop system, glycol filled. I set the thermostat at 65 degrees and the boiler & pump run and shuts off when the stat is satisfied (like it should) but the temperature in the building continues to climbs to 70+ degrees. Would I be better off with a stat with a floor sensor? if so what would model should I install? something simple to use."
    Asked on 6/17/2012 by jkrash from mn

    2 answers

    • VERIFIED BUYER

      A:

      Even if you install a floor sensor, the same problem exists: heating the floor up to a set temp. then turning off the pump, does not equal heat ceases to heat the room.
      The entire floor is essentially a heat source. It will continue to give off heat until the floor temp is equal to the room temp.
      Trying lowering the demand for heat to 62 or 65 and see if you don't find this to be a comfortable room temp. 70 is pretty hot for radiant.

      Answered on 6/17/2012 by Anonymous
    • CUSTOMER CARE

      A:

      Slabs can continue to get hotter even after the circulator shuts down. This thermostat uses pulse-width-modulation technology to turn off the circulator earlier to prevent this from happening. Slab sensor thermostats, like Uponor's 501s, are another option.

      Answered on 6/22/2012 by PexSupply Staff from NY
  • Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire

    Q:

    We installed our radiant system in Warmboard. Can a floor sensor work with such a subfloor and this Upanor Thermostat?
    Asked on 6/14/2012 by Steve from Sacramento, CA

    2 answers

    • VERIFIED BUYER

      A:

      No that stat will not work with sensor. You will need a 511 or a stat
      that has inputs for a floor sensor. You can use a sensor on warm board
      if you cut a channel out for the sensor and wire and seal it back in
      under finished floor. Don't locate sensor directly next to any tubing or
      you will get false readings.

      Answered on 6/15/2012 by Anonymous
    • CUSTOMER CARE

      A:

      This thermostat is not compatible with a slab sensor, but you can use Uponor's A3041501. Its floor sensor works with Warmboard panels.

      Answered on 6/15/2012 by PexSupply Staff from NY
  • Wirsbo Radiant Thermostat (WT 1), Heat Only, Two-wire

    Q:

    I have the WT 1 wirsbo stat installed in my 1200 sq ft building with 1200 feet of 1/2" pex, 4 loops, I have a 11kw boiler. I set the thermostat at 65 degrees and the boiler runs and shuts off when the stat is satisfied (like it should) but the temperature in the building continues to climbs to 70+ degrees. Would I be better off with a stat with a floor sensor? if so what would model should I install? something simple to use.
    Asked on 5/27/2012 by jkrash from Mn

    2 answers

    • VERIFIED BUYER

      A:

      Floor thermos are better for vanity heat, eg. A warm bath floor. Recommend turning your boiler heat temp down. I have mine running at 130 degrees and it only over shoots by 1 degree. Radiant is slow heat but consistent.

      Answered on 5/28/2012 by Anonymous
    • VERIFIED BUYER

      A:

      The first things I would check are these. The easy ones.
      Where is the thermostat situated? How quickly does the
      thermostat/controller react. If you have the thermostat reading the air
      5.5 ft above the floor (normal height for forced air), the temperature will
      continue to rise even after the boiler is stopped unless the pumps are
      stopped as well. Since I do not know the type of boiler you have nor how
      your pumps are set up, I will assume the boiler is heating to max
      temperature so room will continue to be heated until the thermostat hits
      65, but the floors are warmer than 65 so the temperature will continue to
      rise especially if the pump isn't stopped.
      The installation should have taken into consideration the insulation type
      along with the building envelope and the sqft of openings in the
      heated area. This calc would determine the BTUs required for heating the
      space. It's possible you have oversized your system.

      Answered on 5/29/2012 by Anonymous
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