Jackson Systems

Honeywell WT8840B1000 AO Smith Water Heater Gas Valve Replacement

BRAND: Honeywell SKU: WT8840B1000

(21 customer reviews)


MSRP: $379.12
You save 59%

Universal Water Heater Gas Valve, 1″ Insulation Tank, 5″ WC

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138 In Stock


The WT8840B1000 is the Water Heater Control for trade use to replace WV8840 valves used in A.O. Smith Water Heaters. It is designed for use in Standing Pilot applications using an immersion well for water temperature sensing. An included integrated NTC temperature sensor reads water temperature within the appliance up to 221 F (105 C).

This model serves as a replacement for:

  • A.O. Smith 100112336
  • A.O. Smith 9007884005
  • A.O. Smith 316910-000
  • A.O. Smith 316910-000
  • A.O. Smith 321166-000
  • Resideo / Honeywell WV8840B1042
  • Resideo / Honeywell WV8840B1109
  • Resideo / Honeywell WV8840B1110

Features and Benefits

  • Simple replacement requires only four models to replace multiple AO Smith and Bradford White controls
  • Easily service AO Smith and Bradford White natural gas water heaters even if you don’t normally service them
  • Convenient status LED trims repair time up to 30 minutes
  • Resettable Emergency Temperature Cutoff reduces cost and labor time by eliminating valve replacement
  • Reduces customer callbacks with larger pilot flame
  • Accurate temperature sensing improves comfort and eliminates scalding risk
  • Smart anti-scaling algorithms protect children and elderly from water exceeding the setpoint

Additional information

Fuel Type

Pressure Regulator Setting

Setpoint Temperature

Valve – 55°F to 155°F

Spud Size

Body Pattern


Mounting Bracket Type

Ambient Temperature

Thermal Cut Off Switch Limit



Inlet Size

Outlet Size

UPC 085267605038

21 reviews for Honeywell WT8840B1000 AO Smith Water Heater Gas Valve Replacement

  1. Travis

    Product is as described.

  2. Russell R.

    Great price.
    Working just fine thanks!!!

  3. Charles M.

    Best price found for this model

  4. Erin Howard

  5. Ticky Chao


  6. Richard O.



  8. Joe t.

    The control received was a resideo model and not honeywell… AND IT STOPPED WORKING in between 60 and 90 days from installation.
    PLEASE contact me ASAP with warranty replacement options. THANK YOU!

  9. Milton

    So Far so Good.

  10. Jeremy Evans

  11. Gerard B. (verified owner)

    Shipping actually came a day early, good job!

  12. Tristan Haggy (verified owner)

    Item was as described and exactly what I needed to fix the water heater I was working on.

  13. Brian Ritchey (verified owner)

    Fast shipping awesome!

  14. Harold C. (verified owner)

    The order was processed fast, and at a good price. It was the proper part, and I have hot water again.

  15. Chase B. (verified owner)

    So far so good, just installed

  16. Ronald (verified owner)

  17. Susan (verified owner)

    Product as described. Super fast shipping. Highly recommend!

  18. Michael Fowler (verified owner)

    I have looked for several hot water controller modules in the past 6 months. Generally it is difficult to identify a replacement part for older tanks. The Jackson Systems website however did provide my 10 year old part number as one that was compatible with the item I purchased. I was able to verify the layout of the many of the connections to this in their pics. It was a reasonable price and was delivered rather quickly and turned out to be an exact match for my water heater. We now have scalding hot water again… I’m happy and my family is happy. Thanks.

  19. Daniel Hassett (verified owner)

  20. Joel M. (verified owner)

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