'/%3E%3C/svg%3E)
Hover image to zoom
3-Way Valve Actuator for CGT Boilers, 635-100-023
 --%3E %3Csvg version='1.1' id='Fill' xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink' x='0px' y='0px' viewBox='0 0 100 100' enable-background='new 0 0 100 100' xml:space='preserve'%3E %3Cpath fill='%23F15C02' d='M79.44,0.95H20.56C9.78,0.95,0.95,9.78,0.95,20.56v58.87c0,10.79,8.82,19.61,19.61,19.61h58.87 c10.79,0,19.61-8.83,19.61-19.61V20.56C99.05,9.78,90.22,0.95,79.44,0.95z M65.38,58.24l9.38,29.58L49.69,69.78L24.5,87.82 l9.34-29.6L8.8,39.6l30.73-0.17c0,0,6.98-19.61,10-28.93c0.54,1.36,9.88,29.1,9.88,29.1H91.2L65.38,58.24z'/%3E %3C/svg%3E){kind=small}
 --%3E %3Csvg version='1.1' id='Half' xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink' x='0px' y='0px' viewBox='0 0 100 100' enable-background='new 0 0 100 100' xml:space='preserve'%3E %3Cg%3E %3Cpath fill='%23F15C02' d='M30.05,70.23l3.79-12.01L8.8,39.6l30.73-0.17c0,0,6.98-19.61,10-28.93c0.54,1.36,9.88,29.1,9.88,29.1h1.58 L93.71,7.18c-3.58-3.82-8.66-6.23-14.28-6.23H20.56C9.78,0.95,0.95,9.78,0.95,20.56v58.87c0,5.41,2.22,10.32,5.79,13.88 L30.05,70.23z'/%3E %3C/g%3E %3Cpath fill='%23FBC8B4' d='M93.71,7.18L60.98,39.6H91.2L65.38,58.24l9.38,29.58L49.69,69.78L24.5,87.82l5.55-17.59L6.75,93.32 c3.55,3.54,8.44,5.73,13.82,5.73h58.87c10.79,0,19.61-8.83,19.61-19.61V20.56C99.05,15.4,97.01,10.69,93.71,7.18z'/%3E %3C/svg%3E){kind=small}
Hover image to zoom
$208.70 each
In Stock
Get 7 Tue, Jul 7
Order by today, receive Tuesday
This item replaces: VC8710-03
'/%3E%3C/svg%3E){kind=small}
Free Shipping This item ships free
Easy Returns No restocking fee for 90 days
Product Highlights
–
CGT Boilers
Description
–
Weil-McLain 635-100-023 3-Way Valve Actuator for CGT Boilers
A replacement 3-way valve actuator used on Weil-McLain CGT boilers as part of the boiler's 3-way valve assembly.
Key Features:
Compatibility & Applications:
Installation & Operation Notes:
Maintenance & Troubleshooting:
User Reviews & Q&A Summary:
A replacement 3-way valve actuator used on Weil-McLain CGT boilers as part of the boiler's 3-way valve assembly.
Key Features:
- 3-way valve actuator (as listed by the manufacturer)
- Listed for CGT boilers
- SupplyHouse notes: This item replaces VC8710-03
Compatibility & Applications:
- Listed as Used With: CGT Boilers
- Weil-McLain's parts catalog shows 635-100-023 as the 3-way valve actuator in the CGT "water trim" parts listing (manufacturer parts catalog)
- Must only be used where the manufacturer specifies this exact part number: 635-100-023
Installation & Operation Notes:
- Installation should be performed by a qualified boiler/HVAC technician.
- Reference the CGT boiler's service/installation manual and the manufacturer parts documentation for correct actuator replacement steps and any required operational checks.
- The provided sources do not include detailed wiring, setup, or commissioning steps for this actuator; follow the unit documentation for the approved procedure.
Maintenance & Troubleshooting:
- This actuator is typically replaced when the boiler's 3-way valve function is not operating correctly and service guidance calls for actuator replacement.
- Customer review themes commonly associate replacement with restoring normal operation of the 3-way valve function; some note repeated actuator replacement over time in certain installations.
- Some reviewers recommend addressing the valve assembly condition during service (for example, replacing the valve cartridge/plunger at the same time) when corrosion/mineral buildup or sticking is suspected; follow the manufacturer's documentation for the correct repair approach.
User Reviews & Q&A Summary:
- Reviews commonly describe it as an exact-fit, direct replacement for CGT boiler applications, including units using a Molex-style connector.
- Many report successful restoration of operation after replacement and describe the repair as straightforward.
- Critical feedback trends toward longevity concerns in some installations, with comments referencing moisture/mineral buildup in the valve area as a contributing factor.
Specs
–
| Used With: | CGT Boilers |
|---|
Contact
+
Happy Independence Day!
Our Customer Support will be closed today in honor of Independence Day. We will be back tomorrow to answer your questions.
Call or text 888-757-4774
Special Hours
Closed Now
Monday – Thursday
8am–7:45pm
Friday
9am–7:45pm
Saturday – Sunday
9am–5:45pm
You May Also Need
Product Reviews
4.61 out of 18 reviews
94% would recommend this product
5 star
83%
4 star
0%
3 star
11%
2 star
6%
1 star
0%
Customer Images
Most Liked Positive Review
Exact Replacement Actuator
Exact direct fit replacement actuator with the molex connector for the Weil McLain CGT boiler. I would recommend that the smart service person also replace the valve cartridge at the same time for continued longevity. Simple do it yourself installation for both parts, less than one hour. Saved big $$$ compared to the cost of an on-site service visit plus parts.
VS
Most Liked Negative Review
 --%3E %3Csvg version='1.1' id='With-RB' xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink' x='0px' y='0px' viewBox='0 0 100 100' enable-background='new 0 0 100 100' xml:space='preserve'%3E %3Cpath fill='%23FBC8B4' d='M79.44,0.95H20.56C9.78,0.95,0.95,9.78,0.95,20.56v58.87c0,10.79,8.82,19.61,19.61,19.61h58.87 c10.79,0,19.61-8.83,19.61-19.61V20.56C99.05,9.78,90.22,0.95,79.44,0.95z M65.38,58.24l9.38,29.58L49.69,69.78L24.5,87.82 l9.34-29.6L8.8,39.6l30.73-0.17c0,0,6.98-19.61,10-28.93c0.54,1.36,9.88,29.1,9.88,29.1H91.2L65.38,58.24z'/%3E %3C/svg%3E){kind=small}
I have to buy this product, Again n Again ????
Honeywell 3 way valve actuators don't last longer than 2-3 yrs max. IMHO
My Wiel Mclain Gtc gold series tankless boilers were installed in 2009. I have replaced 5 actuators on them already. Moisture, minerals and a corrosion (rust like mineral build up) in the valve beneath. Causes it to fail. Btw Honeywell makes the valve too. Not sure how a mostly plastic n o-rings valve, can rust up n get stuck with minerals, in city drinking water system. Is beyond me. But a new on e every other year or two ? Is a bit much. I
Except u Cpcan't heat ur home n water without them. Yet the prices go up n the model Sku's/ #'s keep changing.
Now I can't even walk into a plumbing supply store to get them (( what a local racket).
Thank goodness for Supply House. Even if they constantly keep changing sku's n model numbers. Which even stumps their service reps, too.
Showing 1-10 of 18 reviews
Definitely. It have a good quality
I use it on my on boilers. For some reason some of this actiator doesn't have a long life.
Junqueira
New York NY
1 years ago
Verified Buyer
Was this review helpful to you?
Good product
perfect replacement
joe
pa
1 years ago
Verified Buyer
Was this review helpful to you?
Great for now, but later
I have a Weil Mc claim Ctg5 tankless water (close heating loop) heater. This part works in conjunction with a 3way cutoff water valve.
When it works all is good. When one or the other fails over time (1-3 yrs.) Needs to be replaced.
(This typically happens during the home heating season.)
During installation of this heater, I was warned about the external parts. Truer words were never spoken.
I've watched the price for this part rise over 14yrs of operation .
I've gone through 4-5 of these. (No longer covered by gas co. Service Plan).
Lucky me, after a few expensive service calls, I watched and could duplicate, servicing this unit myself. Thx to "SupplyHouse", for making these parts avail.
Stevie Knicks
Southern New England usa
2 years ago
Verified Buyer
Was this review helpful to you?
very good
Works great!
Ben3link
Lowell MA
2 years ago
Verified Buyer
Was this review helpful to you?
Great Product & SUPER service
This product was exactly what we expected! Ordering - shipping - and quality are always SUPER when working with Supplyhouse.com
MPH
Gorham, ME
3 years ago
Verified Buyer
Was this review helpful to you?
Fast and reliable
Received this part fast. Part was exactly what I was looking for and solved my inoperative circulator issue on my CGT boiler. Always trust Supply House to get your parts to you quickly !
Gary
Salisbury NH
3 years ago
Verified Buyer
Was this review helpful to you?
Loose piece rattling around in the inside
I had this part installed but there a loose of something rattling around in the inside. We didn't open it cause we didn't want to void the warranty. We installed it as is but with cautious optimism that it won't interfere with the operational of the part.
Edwin N
New Windsor New York
4 years ago
Verified Buyer
Was this review helpful to you?
I have to buy this product, Again n Again ????
Honeywell 3 way valve actuators don't last longer than 2-3 yrs max. IMHO
My Wiel Mclain Gtc gold series tankless boilers were installed in 2009. I have replaced 5 actuators on them already. Moisture, minerals and a corrosion (rust like mineral build up) in the valve beneath. Causes it to fail. Btw Honeywell makes the valve too. Not sure how a mostly plastic n o-rings valve, can rust up n get stuck with minerals, in city drinking water system. Is beyond me. But a new on e every other year or two ? Is a bit much. I
Except u Cpcan't heat ur home n water without them. Yet the prices go up n the model Sku's/ #'s keep changing.
Now I can't even walk into a plumbing supply store to get them (( what a local racket).
Thank goodness for Supply House. Even if they constantly keep changing sku's n model numbers. Which even stumps their service reps, too.
Steve, if u wanna believe
Southern New England usa
4 years ago
Verified Buyer
Was this review helpful to you?
Will deal with them again
perfect fit no promblems
jersey hank
08210
5 years ago
Verified Buyer
Was this review helpful to you?
works great
works great just make shore its same numbers as on old won or will not work
ted
ct
6 years ago
Verified Buyer
Was this review helpful to you?
Free Shipping
On orders over $99
We offer flexible shipping and scheduling options, up-to-date delivery estimates, and free ground shipping on any order over $99 to make sure your order gets to you on-time, for less.
Shipping PolicyEasy Returns
Returning items is as simple as 1-2-3
Ordered the wrong product? Item damaged in transit? Our 3-step process makes returning products easy – even up to a year after purchase – with no restocking fees on returns made within 90 days.
Return Policy