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Brand: Uponor (Wirsbo)
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Slow-opening Thermal Actuator (24VAC) mounts directly onto 1 1/4" Brass and truFLOW Valved Manifolds. It provides individual loop flow control on a multi-zoned manifold (manifold serving more than one zone). Thermal Actuator includes end switch for activation of relay (pump), heat plant or other auxiliary devices. Do not mount actuators upside down.
(based on 32 reviews)
of respondents would recommend this to a friend.
Most Liked Positive Review
Great design -- Time will tell
This controller replaces Wirsbo motorized controllers that failed after only 5 years in residental use. The motorized actuators open much more quickly. In discussions with Uponor tech support, it seems that Uponor is...Read complete review
This controller replaces Wirsbo motorized controllers that failed after only 5 years in residental use. The motorized actuators open much more quickly. In discussions with Uponor tech support, it seems that Uponor is aware that the motorized controllers have durability problems. However, after some frank comments on my part, the Uponor tech suggested these thermal actuators would likely last a lot longer and perform well if 6 minute switch times were acceptable. So far, so good. The switches are German-made, compact, and sheathed in high-quality molded plastic. They directly replace the motorized actuators and can be mixed with the motorized actuators.
Most Liked Negative Review
Don't Know yet
My in-floor radiant heating system uses 13 valve actuators. In 11 years of service, 3 motorized actuators have failed. Apparently the mechanical zone valves get sticky and the valve actuators exert a lot...Read complete review
My in-floor radiant heating system uses 13 valve actuators. In 11 years of service, 3 motorized actuators have failed. Apparently the mechanical zone valves get sticky and the valve actuators exert a lot of force to open them. All of the motorized valve actuators in my system have failed because the plastic parts on the actuator are too weak and they break. I have not used the new style thermal actuators yet and I am somewhat apprehensive that because they are all plastic, that they too will break if they have to exert a lot of force on a sticky valve. There are no alternative devices, so I guess we have to use the new design actuator. At least they are less costly than the old style. I hope to be pleasantly surprised and the new ones will hold up for a long time.
Reviewed by 32 customers
Displaying reviews 1-10
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Comments about Thermal Actuator, Four-Wire:
Perfect replacement for my thermal actuator. Easy to install and much easier to tell if it's open or closed. Time will tell how long lasting it will be.
Bottom Line Yes, I would recommend this to a friend
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Easily installed by homeowners
By Mark Carlson
from La Conner, Wash.
The pictogram-style installation instructions were clear enough, and installation of the made-in-Germany actuators went smoothly, sparing me from an expensive service call by the HVAC guy. The supplied rings were too small for my manifold but the actuators snapped on to the existing rings, which were slightly larger than the ones than came with the units. My hydronic system is now functioning as it should. I hope these actuators will last longer than the Roths they replaced.
There's 28 zones in our system
from Allentown, New Jersey
Our system is nine years old, has 28 zones and I've had to replace all of these actuators once and some twice. Heat,this is a heating system, eventually causes the retaining clips to fail rendering the actuator useless. We're stuck with this system as to use better actuators we would have to replace all the manifolds.
Bottom Line No, I would not recommend this to a friend
I would buy agin if I need another.
Huge improvement vs motorized actuators!
from Auburn, CA
I recently replaced all the older-style motorized Wirsbo actuators with these thermal actuators. They work much better and more reliably. With the motorized actuators, I sometimes had the situation where the thermostat called for heat but the actuators would not turn the pump on, OR the pump was incorrectly on when the valves were closed. These new thermal actuators solved those problems 100%. They are very easy to install; just be sure to initially cycle all zones through one on/off cycle, as the actuators come in sort of a "half-on/half-off" state.
Identical Replacement was fast & easy
By Rod the Homeowner
from Placitas, New Mexico
I ordered replacements for the motorized Wirsbo actuators from PexSupply using their website. They arrived promptly. It took atmost 15 minutes to install and test each actuator. The Uponor replacements work perfectly and all heat zone problems are fixed. The local indicator is a handy diagnostic. After nearly a month of using them, my only regret is that I did not order enough actuators to replace all the old units in my system.
Good replacement actuator
from Norman, OK
Easy to install.Worked good
can't wait to try them
from hot springs village arkansas
These were bought to replace the actuators that give me problems. I haven't used any yet so they are like a stand by.I had problems with the first & second style modulators.I wish that there were instruction sheets enclosed,I guess it a learn as you go thing.
from Dow City, Ia
The product seems to be much better and quieter than the actuator that it replaces. I do think that shipping on the product could have been quicker.
works well but...
from Snohomish, Wa.
The instructions were so simple that they didn't provide enough information on how they were initialized. This led us to return the first set and the house remained cold till the new set arrived. When they didn't work your customer service sent us to the manufacturer.
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