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- 20A2S39 Middleby Marshall - High-Performance Thermostat 20A2S39 Middleby Marshall - High-Performance Thermostat


20A2S39 Middleby Marshall - High-Performance Thermostat
- Description
- Shipping & Returns
- Reviews
Discover the 20A2S39 Middleby Marshall Thermostat, engineered for precision temperature control in commercial cooking applications. This thermostat is ideal for maintaining optimal temperatures between 250°F and 850°F, ensuring your dishes are cooked to perfection.
- Type: KNP - Durable and reliable for high-performance kitchens
- Temperature Range: 250°F to 850°F, suitable for various cooking needs
- Features a 5/32" x 9" bulb and 48" capillary tube for accurate readings
Replaces Part Number
Middleby Marshall: 20A2S39, 3004281
Star Mfg: 20A2S39, 2T-3004281, 2T-30402-23, 3004281
Toastmaster - See Middleby Marshall: 20A2S39, 2T-3004281, 3004281
Lang: 2T-30402-23, 30402-23
Southbend: 3004281, SOU3004281
Specifications
- Dial Size: 2-1/4" diameter
- Position: Flat mount with a mounting depth of 0.187"
- Compatibility: Compatible with Southbend RA36C1W, RA36C7W, and Toastmaster range models
Fits model
Lang: 224THG, 36S, 36S-0, 36S-10, 36S-12, 36S-2, 36S-20, 36S-3A, 36S-M, 500S, 500S-A, 500S-B, 500S-C, 500S-D, 500S-E, 500S-F, 500S-G, 9P-RT36D-440VG, CLR36-H-U, CR30-AP, CR30-PT, R12-ATG, R30C-AP, R30S, R30S-M, R60S, R60S-ATA, R60S-ATB, R60S-ATC, R60S-ATD, R60S-ATE, R60S-ATF, R60S-ATG, R60S-ATH, R60S-ATI, R60S-ATJ, RF-21S, RF21CT-AM-U, RF21S-A, RF21S-C, RF21S-D, RF21S-G, RF21S-H, RT30A-208VCF, RT30S-CF, SCR30, TRE36C1, TRE36C2, TRE36D1, TRE36D2
Southbend: SE36N-TTT208
Shipping & Returns – B2BFSI
Effective Date: April 2025
Contact: support@b2bfsi.com
Shipping Information
We ship within the United States only using UPS.
Shipping is fully automated—you will not be able to place an order if the item is out of stock.
At this time, we do not offer free shipping or allow customers to choose the warehouse location.
📦 Shipping Carriers: UPS
🚚 Order Availability: Automated stock check — only available items can be ordered
🌍 Shipping Region: United States only
❌ No International Shipping
Returns Policy
Eligibility & Timeframes
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Returns are accepted within 14 days of receiving your order.
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Defective or non-working parts may be returned within 90 days.
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Items must be unused, in original packaging, and include proof of purchase.
How to Start a Return
You can start a return in two ways:
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Log in to your account at https://account.b2bfsi.com and use our automated return portal.
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Email us at support@b2bfsi.com to request return authorization.
🔁 Items sent without prior return authorization will not be accepted.
🏷️ Final sale items are non-returnable.
Return Shipping & Fees
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If we made a mistake, we will provide a UPS return label and cover return shipping.
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If the return is for any other reason:
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Customer covers return shipping
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A 25% restocking fee applies
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Return must be initiated and delivered back within 14 days
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Return Address: Provided after return request approval
Return Carrier: Only UPS is accepted
Non-Returnable Items
We do not accept returns on:
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Final sale or clearance items
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Special-order or customized parts
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Used electrical components
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Hazardous materials or flammable liquids
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Gift cards
Damaged or Incorrect Items
If your order arrives damaged or incorrect, please contact us immediately. We will assess the issue and provide a resolution.
Exchanges
We do not process direct exchanges. If you'd like to replace an item, please return the original and place a new order.
Refunds
After we receive and inspect your return, we’ll notify you of the approval. If approved:
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Refunds are issued to the original payment method
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Processing takes up to 10 business days
If more than 15 business days have passed since your refund was approved, please contact us at support@b2bfsi.com.
Summary
Return Window | Return Shipping | Restocking Fee | Refund Time |
---|---|---|---|
14 days | Customer (unless our fault) | 25% | Within 10 business days |
🛠️ Warranty returns accepted up to 90 days from delivery
📦 Only UPS is accepted for returns
📬 For return authorization, log in to your account or email us
Related products


Frequently Asked Questions
How to replace?
- Step 1: Disconnect power to the cooking appliance.
- Step 2: Remove old thermostat by unscrewing it from its mounting location.
- Step 3: Install the new thermostat by aligning it properly and securing it with screws.
- Step 4: Connect the wiring according to the manufacturer's instructions.
- Step 5: Restore power and test the thermostat functionality.
Estimate time?
Approximately 20-30 minutes.
What tools are needed?
A screwdriver and wire cutters/strippers may be required for installation.