Marley, Qmark, BerkoGenuine OEM Part

Marley WT12A Thermostat Double Pole Snap Action Wall Mount

Part # WT12A
Thermostat

Marley WT12A double pole line voltage wall thermostat for heating, rated 22 amps on 120 and 240 volt circuits.

$385.60

Usually ships in 1-2 weeks, contact us to confirm lead time

Available on backorder

Genuine OEMFactory original part
Same-Day ShippingIn-stock orders by 4 PM Central
90-Day ReturnsSee return policy
Expert Support800-654-3545Mon–Fri, 8 AM–5 PM Central

SKU: YWT12A Categories: Marley, Marley Qmark Berko Heater Parts, Thermostats

Will This Part Fit?

Match the part number WT12A to the part in your heater, or send us your model number and we’ll confirm it fits before you order.

Need help finding your model number? Not sure? Call 800-654-3545 or email [email protected].

About the Marley WT12A

The WT12A is a double pole, single throw (DPST) line voltage thermostat for heating applications such as electric baseboard and wall heaters. Because it switches both legs of the circuit, it gives a true off position on 240 volt installations.

It's rated 22 amps and works on 120 or 240 volt circuits.Not sure it fits? Call us with your model number and we will confirm before you order.

Installation Tips

Turn off power to the heating circuit at the breaker before removing or wiring a line voltage thermostat.

Product Details

Part Number	WT12A
Brand	Marley, Qmark, Berko
Part Type	Thermostat
Manufacturer Description	THERMOSTAT DOUBLE POLE SNAP ACTION WALL MOUNT
Condition	New — Genuine OEM
Poles	Double pole (DPST)
Current Rating	22A
Voltage	120/240V
Application	Heating only
Availability	Backorder — call for an estimated ship date
Returns	90 days on new, unused items
SKU	YWT12A

Not sure this is the right part?Our parts experts will check it against your model number.800-654-3545 · [email protected]Mon–Fri, 8 AM–5 PM Central

Why Buy From Carroll Parts?

Helping Fix Things Since 1938Over 85 years of parts expertise
Same-Day ShippingIn-stock orders placed by 4 PM Central ship the same business day
90-Day Return PolicyBuy with confidence
Real Parts Experts800-654-3545 · Mon–Fri, 8 AM–5 PM Central

Frequently Asked Questions

Is the Marley WT12A a genuine OEM part?

Yes. This is a genuine Marley factory replacement part, not an aftermarket copy.

When will my order ship?

This part is currently on backorder. Call us at 800-654-3545 for an estimated ship date.

What is your return policy?

Items must be new and unused. You can return them within 90 days. Please read our return policy before sending anything back. Questions about a return? Call 800-654-3545 or email [email protected], Mon–Fri, 8 AM–5 PM Central.

What Our Customers Say About Carroll Parts

Carroll Parts

4.9

Based on 913 reviews

Jason S.

14 hours ago

My first attempt was buying a less expensive part on Amazon. Huge failure! Didn’t fit properly. I stepped up and went to you guys and it’s perfect. Lesson learned!

Jim K.

3 days ago

It was nice to find a replacement faucet to replace my leaking push button faucet. Better design IMO. Fast shipping, easy to install I'll keep Carroll Parts in my address book!

karin T.

3 days ago

Received our 2 orders in a timely fashion.

Joe R.

4 days ago

Very quick turnaround. Got what I expected on first attempt!

Barbara C.

4 days ago

Excellent customer service! Shipped fast! Part worked great!

John L.

4 days ago

My order was easily placed with the sales associate. Payment was easy, delivery was quick. All Great!

John T.

5 days ago

Got a replacement remote for an old Emerson fan unit that was no longer supported. The new remote works great and I'm delighted Carroll was there to support me. I probably should behave gotten two of them

Richard M.

6 days ago

Exactly the part I ordered and was OEM.

Caroline De W.

2 weeks ago

Easy to order. Quick to arrive.

Chris H.

2 weeks ago

Was able to locate the exact part I needed. They were able to quickly turn around and ship it to me so I could complete my repairs. Really happy I found this place.

Peter B.

2 weeks ago

Fast and professional. Thank you

Jim M.

2 weeks ago

They had the exact fan lens that we needed!

M R

2 weeks ago

Part arrived as ordered. No issues

Rick P

3 weeks ago

Well packaged and delivered as ordered in timely. Parts exact fit.

Esther B.

3 weeks ago

Fast shipping, packaged great, part great, service great.

Yury K.

3 weeks ago

great experience from beginning to the end. really great. thank you.

John W

3 weeks ago

Parts ordered were exact fit no issues with order shipping a little pricey

Debra L C.

3 weeks ago

So glad I was able to get the replacement part I needed. Ordering was easy and shipment quick! I’d certainly use again. Thank you

Marlene M.

4 weeks ago

Order was processed, shipped, and completed flawlessly !!

Reuben Jones J.

4 weeks ago

I needed a switch for my vacuum cleaner and it worked out perfectly. I will use your company again.😊😊👍🏾 and delivery was fast

Greg B.

4 weeks ago

Fast, professional service.

Matthew N.

4 weeks ago

Easy to order, shipped quickly, showed up when it was supposed to. Would definitely use this company again.

Larry M.

4 weeks ago

Fast service, no b.s., but most important was having hard-to-find parts.

LauraLou M.

2 months ago

We needed a new “end piece” for our under-sink hot water heater dispenser. I got on the internet and started asking questions and was directed to your site. I was directed to where I could find the information you needed to get me the proper color etc and voila! Now I have the part. Thank you for making something that seemed impossible to find a much easier task than I assumed it would be.

Daniel W.

4 months ago

We needed a new motor to fix our bathroom exhaust fan which had since been discontinued. They had the old part and shipped it quickly. I installed it and it works perfectly. They saved me hours from having to uninstall & then install a new exhaust fan setup!

Keith E.

5 months ago

Great job ordered over the weekend.The order was filled First business day, andand I was notified immediately when it was shipped. Package arrived in a very reasonable amount of time via ground transport. Can't imagine experience being any better. Thanks.

Buddy G

8 months ago

I needed the OEM part. My first attempt on Amazon sent a Chinese part and it didn't work. You guys sent the correct part. Perfect. The bummer was that shipping charge was more than twice the cost of the part. Still, I'm happy with the ease of the web purchase and fast shipping time.

Rachel J.

9 months ago

The website was user-friendly, and I found everything in excellent condition. Shipping was timely and well-packaged. Would purchase from here again.

Matthew B.

9 months ago

My in-laws instant hot started leaking and when I researched the issue, Carroll Parts was tagged in a repair video and a link to the exact part I needed. Ordering was super easy, the part came a day early, and the leak was repaired in a few minutes!

D D.

9 months ago

My Insinkerator instant hot water dispenser arrived on time, and as described. I had found for a few dollars less on Ebay but had less confidence in the supplier. I am happy with my purchase as it was easily installed in about ten minutes as replacement for the old one. Be sure and note that this unit is for the heater ONLY, no additional hardware, hoses, dispenser, etc. It was what I needed; be sure that is all you need.

James W.

9 months ago

I contacted the kitchen faucet manufacturer for a replacement defective part. They were NO help. But I found what I needed on Carroll Parts easily for a great price and super fast shipping. Carroll is now my "go-to" parts house.

James M.

10 months ago

I ordered a replacement Insinkerator "Instant Hot" electric boiler for the kitchen sink. Carroll's price was the best online - cheaper than Amazon even with paying shipping. The order was shipped quickly and arrived in a timely manner. I would order from Carroll Parts again without and hesitation.

Richard J.

10 months ago

Pretty simple, my Instahot tank blew the heater and I needed a replacement. Every other place only wanted to sell me a completely new unit (with an unneeded faucet). Carroll had exactly what I needed, at a reasonble price, and shipped it on time. Highly recommended.

Lyle K.

11 months ago

Generally a very good transaction. The website is excellent and even had an install video. The selection of OEM equipment is great and so is the pricing. My only complaint is that shipping costs were higher than I expected, but it was FedEx so I thought that was OK. It came USPS….

Rob K.

11 months ago

Carroll Parts was great in helping us find a hard to locate part. After the sale they maintained excellent communications and tracking support. Great company to do business with.

Ellen S.

11 months ago

They had the item I needed significantly cheaper than other retailers, including Amazon. The item was shipped quickly, packed well with tracking. I would happily buy from them again.

Tj M

12 months ago

Easy to find this hose for my old Craftsman vacuum. Looks like the stock, original piece and much thicker and heavier than the last replacement I found at one of the home centers. Good find, shoulda' bought two.

Christopher S.

12 months ago

I ordered three (3) as they were inexpensive and . . . my neighbor has the same model! She was thrilled, and put a new blade on her X-acto knife (a furniture maker) and carefully removed the baffle, as I did, then dropped the replacement in. Cheers all around! So, No. 3 is the neighborhood spare. I used a Magill forceps (I’m a medical writer and interviewer) in the past to remove foreign objects that fell in, while the neighbor always had a pair of long needle nose pliers handy. We both agreed that it was “about time” we had a removable/replaceable baffle. (Yes, yes, we always always unplugged the unit, even flipped the breaker, before diving in.)

Robert T.

12 months ago

Service was outstanding. The only issue was the failure of USPS to deliver the product within the originally stated time window of Oct 31 or Nov 1. It arrived Nov 6 or 7. Perhaps an Amazon delivery would be better for your customers.

Bill S.

12 months ago

Hard-to-Find Parts, Fast and Hassle-Free I was blown away to find replacement parts for a Craftsman shop vac that’s easily 15–18 years old. Carroll Parts had exactly what I needed. The ordering process was smooth, shipping was fast, and everything arrived well-packaged and in perfect condition. It’s rare to find a company that stocks legacy parts and delivers top-notch service. Highly recommend for anyone trying to keep their older tools running strong!

Cheryl B.

12 months ago

I was sooo impressed! I have a ceiling fan that has up and downward lights, too. After 20 years, the remote wore out. I looked on-line and couldn't see where I could buy the same thing, since so many years. I ended up phoning Carroll Parts and got the most INFORMATIVE, patient man who directed me to a remote that WOULD work for my old unit--it just looked different and had been rebranded. I received it and am back on track! These days, a consumer doesn't always get great help "from a human"!! It was GREAT! Highly recommend!!

Karen

1 year ago

Quick delivery, excellent price, great communication and a large volume of parts available. Perfect transaction. Thank you!

Luis C.

1 year ago

Requested a tank-only for an old model In-Sinkerator and Levi gave me a quick answer, a timely delivery, fair price. The tank was easy to install, and it operated correctly.

Rosie S.

1 year ago

If I could give your compay & Bob, in particular, 10 stars I would do that. I am a senior and I can honestly say that this is the first company I have dealt with in a LONG time that knows the meaning of customer service. Bob went out of his way to let me know the status of my order when FedEx seemed to have a problem with my delivery. Kudos to Bob and Carroll Parts. Your service was MUCH appreciated. Thx

Anton R.

1 year ago

Ordered 2 separate items from this company. Both of them processed and shipped very fast. Once received, the items were in excellent working condition and had no problems installing them where they were needed. Thank you!

Howard T.

1 year ago

I needed the mounting hardware to mount my Insinkerator disposal to my new kitchen sink. I called to order the parts and the sales person knew exactly what I needed and gave me a couple of choices to choose from. Price was reasonable and shipping was fast.

Travis N.

1 year ago

This a a great company. They recommend the appropriate parts I needed when I called and asked questions. (Yes I was able to speak with a real human.) Both times they were very helpful and knowledgeable about the product. Buy from them i stead of feeding the amazon monster.

Rusty A.

1 year ago

The remote control for my bedroom ceiling fan, the only way to start it and turn on the light had given op the ghost. I contacted Carroll parts and had a new one in two days,, What an amazing customer service. If I have need of any other parts for anything in my house, you can bet your bottom dollar I will call them again!

Karen K (Karen K.

1 year ago

I ordered an "InSinkErator 76694 Stopper Cover Control Plus" to replace the previous one I had. I provided the part number to the Customer Service person I spoke with. Unfortunately, the part # I had no longer exist. However, per my description of the part, the Customer Service person was able to locate the identical part (different number). My order was fulfilled immediately and arrived in just a few days. The fit and function is perfect! I am happy the part was in stock and arrived so quickly. Thank you!

Mary J.

1 year ago

The gentleman that I talked with on the phone was very polite and helpful. He answered all my questions so I could make sure that I was ordering the correct part. Great place to do business with!

Daniel D.

1 year ago

Very good overall experience. Website was easy to use and the order processed quickly. Shipping got hung up by Fedex for several days. Carroll may want to explore alternative shippers.

Forest W.

1 year ago

Needed to replace the faucet portion of our hot water dispenser I was so happy to know that you had a replacement! Thank you it's a perfect replacement and working like brand new.

CHRIS D.

1 year ago

Great customer service!

Michael H.

1 year ago

I ordered a specific part and it came correctly on time

Tucker P.

1 year ago

Parts were shipped in a timely manner and without problems. part worked and we're up and working

Sara G.

1 year ago

The part was what I needed….it was so hard finding this exact part to fix our water supply to our refrigerator. Also, added bonus, the price was good…. Better than Amazon!

Rebecca G.

1 year ago

Best website that gives a great description of these little screws I needed for my garbage disposal unit. This was something I couldn’t buy in person in my city because not one hardware store carried such items. Although I paid more in shipping then the product itself, it’s worth the money because it saved me the stress and time searching; too convenient!

Thom D.

1 year ago

Had the parts I required for a 21 yo fan. Ordering was straight forward and shipping was quick and received on time. The part worked perfectly and I am pleased to have fan and lighting functional again.

Skunk G.

1 year ago

Secure service, fast shipping, perfect part for our sink! Thank you

Anne O.

1 year ago

Easy to order and arrived on time. Would have been even better if the price was lower.

Joanne S.

1 year ago

Exactly what I needed. Thank you.

Eric F.

1 year ago

Replacement instant hot water dispenser came quickly. I found no other supplier offering just the heater. It was significantly less expensive than buying the heater and faucets.

Dave G.

1 year ago

Best all-around value for price and quality of parts, professional service, and prompt reasonably priced delivery. 👍👍

Ed L

1 year ago

I was slightly disappointed when I ordered the right part for my discontinued Craftsman shop vac. I ordered a replacement blower wheel that actually fits a Rigid. The problem was the one sent was only a 1/4" between the impeller and my original wheel was 3/8". Good news is the Representative found the correct wheel. Back in business. I however, had to pay for return shipping.

Charles M.

1 year ago

Was initially sent the wrong part, after specifically asking if the part # would work for my replacement. We shipped the incorrect part back and received the new one yesterday. So all is good.

Nancy S.

1 year ago

High quality parts. Delivered and packed nicely.

Catherine B.

1 year ago

I was delighted to find a replacement plunger for my disposal. It arrived quickly and was in excellent condition. A smooth and satisfying experience from start to finish.

Linda H.

1 year ago

Part came and it fit perfect

Christine D.

1 year ago

Great experience with Carroll parts! When I mistakenly ordered the incorrect part, the folks at Carroll helped me to find the correct part and wavied the restocking fee. I got the right part in no time thanks to their help!

patricia P.

1 year ago

Very accommodating when I realized I needed to change address. No delay in delivery and part fit perfectly for my needs. Thank you! Patricia Patterson

Jim S.

1 year ago

staff was very helpful with my questions and led me to a successful fix of my problem.

Chuck W.

1 year ago

Best Service Ever! From answering my questions to fulfilling my order, Carroll Parst exceeded my expectations. I needed wheels for a 32+ year old Sears Wet/Dry vac and they were able to accommodate. They researched my product, found the correct part, and shipped almost immediately. I even followed up on the order because the parts were shipped to an APO box and their customer service department answered my inquiry in less than 24 hours. Highly recommended!

Sparky E.

1 year ago

Loved that the part I needed showed other parts associated, as well as a video on proper installation. Delivery was quick, price was right. Would use again.

Mike V.

1 year ago

Very helpful and responsive to emailed questions. I would recommend Carroll Parts. Very satisfied.

Hans S.

1 year ago

Excellent price. Extensive selection. Fast shipping. Easy!

John D.

1 year ago

This was the first time I made a purchase at Carroll Parts. The parts were exactly what I wanted. The price was very reasonable. The order was easy to place and the delivery was great. I highly recommend this company and I will order from them again. Thanks for helping me.

Jim B

1 year ago

Found exact OEM part for my older Shop Vac at Carroll Parts. Manufacturer site listed this part as no longer available. A phone call confirmed part was in stock at Carroll. I then placed an online order and received the part shortly after. The part was an exact fit and function as the original at a price cheaper than non-OEM parts found on other sites. I've ordered from Carroll in the past with the same great results.

Curt D.

1 year ago

I found a hard to find part on Carroll Parts website, ordered it and received it as they promised.

John N

1 year ago

Part Fitted well.. thanks

Tim C.

1 year ago

Great selection, fast shipping, and fair price. Highly recommend.

John I.

1 year ago

Perfect experience

Hal B.

1 year ago

I've been ordering replacement humidifier filters from Carroll Parts for many years. They are always very responsive and the filters have always been a perfect fit. That's why I keep going back to them.

Marilyn F.

1 year ago

Excellent communication with customer service. Parts fit perfectly

Chantal L.

1 year ago

We are very satisfied with the part. It works perfectly. But the shipping cost was expensive, double the price of the purchased item. Especially since we are Canadian and have to pay for the exchange. Thank you.

john C.

1 year ago

The part fit my craftsman shop vac perfectly. Thanks for your suggested switch. I was told by craftsman that the on off switch was no longer available. Thanks for saving me the cost of a new shop vac.

Calvin F.

1 year ago

Excellent experience. Sent exactly what I ordered. Easy to browse website.

Christianna R.

1 year ago

Parts came on time and packaged well

Dawn W.

1 year ago

Good price & fast shipping

Tim B.

1 year ago

Parts arrived later than originally forecast. fit was good. Shipping cost more than parts. Could have shipped USPS for less

Jim B.

1 year ago

The part I needed delivered quickly.

Mel P.

1 year ago

Prompt delivery and accurately filled order.

Brian S.

1 year ago

Install was easy and vacuum now works !

Mike & Vickie S.

1 year ago

Great service and the representative was very informative. Much appreciate the support and I will recommend Carroll Parts.

Arlene W.

1 year ago

The part I needed was in stock and was shipped immediately. When I received the item, there was a QR code with a video on how to install this part, it was extremely helpful. Highly recommend this company.

ricardo M.

1 year ago

I Did enjoyed the professional care and fast resolution of my items in a friendly manner.

KASANDRA C.

1 year ago

Great customer service!!!

Lawrence G.

1 year ago

I searched and searched for a part I needed for my shop vacuum way out of date, running into a brick wall at every search until Carroll parts they had exactly what I wanted and I purchased the part, a perfect fit.

Shawn M.

1 year ago

Wonderful business to shop at!! If Carroll Parts don't have it, you don't need it!!

BEN M.

1 year ago

I shouldn’t have to pay more in shipping than I did for the actual part.

Mark M.

1 year ago

They had the part that I was searching for. I received it when they said that I would and the part was exactly what I was searching for. I installed it and the heater is working perfectly. Thanks 👍

alvin B.

1 year ago

The parts were very reasonable. Shipping was a bit expensive but the process was A1.

Joseph R Spadea J.

1 year ago

Shipping was too expensive, otherwise a great service.

Matthew L.

1 year ago

Good price and prompt service! Who needs Amazon!

Rick M.

1 year ago

Replacement blower wheel for 25 year old craftsman shop vac fit perfectly. Up and running again like new.

Lorne S.

1 year ago

Well executed order fast shipping

Nancy K.

1 year ago

great customer service

James F.

1 year ago

Quality product Fast shipping

Don P.

1 year ago

Got the part I needed at a great price. It arrived in 2 days. I couldn't ask for anything more.

Matthew M.

2 years ago

I received what I ordered in good condition. Worked well when installed.

Andrew B

2 years ago

They had a hard to find part I was looking for. The part showed up on time and worked great. Will use again in future

Robert W.

2 years ago

Great experience

David S.

2 years ago

Only place I found on line to replace broken handle to hot water dispenser.

William T.

2 years ago

Very good delivery with the right part sent for my kitchen sink, though the price did not totally "drain" me, like everything in plumbing, especially the plumbers themselves, it seemed a wee bit expensive. Appreciate your service.