---
product_id: 58007944
title: "Reliance water heater gas control valve 100112336 trade number WT8840B 160 Degree F 1\" Cavity made by Resideo"
brand: "honeywell"
price: "$320.74"
currency: USD
in_stock: true
reviews_count: 13
category: "Honeywell"
url: https://www.desertcart.us/products/58007944-reliance-water-heater-gas-control-valve-100112336-trade-number-wt8840b
store_origin: US
region: United States of America
---

# 1/2 inch NPT inlet/outlet 5 psi pressure regulation 160°F max temp control Reliance water heater gas control valve 100112336 trade number WT8840B 160 Degree F 1" Cavity made by Resideo

**Brand:** honeywell
**Price:** $320.74
**Availability:** ✅ In Stock

## Summary

> 🔥 Upgrade your water heater’s heart with precision and power! 🔥

## Quick Answers

- **What is this?** Reliance water heater gas control valve 100112336 trade number WT8840B 160 Degree F 1" Cavity made by Resideo by honeywell
- **How much does it cost?** $320.74 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/58007944-reliance-water-heater-gas-control-valve-100112336-trade-number-wt8840b)

## Best For

- honeywell enthusiasts

## Why This Product

- Trusted honeywell brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Integrated NTC Sensor:** Advanced temperature sensing up to 221°F for smarter, safer heating.
- • **Durable Metal Construction:** Robust brass/stainless steel build designed for long-lasting trade use.
- • **Reliable Pressure Regulation:** Built-in 5 psi pressure regulator ensures consistent gas flow and performance.
- • **Precision Temperature Control:** Maintains water temps up to 160°F for optimal comfort and safety.
- • **Universal 1/2" NPT Connections:** Seamlessly fits standard water heater setups for hassle-free installation.

## Overview

The Honeywell WT8840B1000 gas control valve is a professional-grade replacement part designed for AO Smith and similar water heaters. Featuring a 160°F max temperature setting, 1/2 inch NPT inlet/outlet fittings, and a 5 psi pressure regulator, it ensures precise and reliable gas flow control. Its integrated NTC temperature sensor enhances safety by monitoring water temps up to 221°F. Crafted from durable metal and made in the USA, this valve is engineered for easy upright mounting and long-term trade use.

## Description

The Wt8840 Series Is The Water Heater Control For Trade Use to replace WV8840 valves on AO Smith water Heaters. It Is Designed For Use In Standing Pilot Applications Using An Immersion Well For Water Temperature Sensing. Made in United States. Manufactured by Honeywell.

Review: Worked great - Like new, dropped right in, worked like a charm. Late delivery, but recommend.
Review: Perfect replacement for WV8840B1042 - Fit and works perfectly for my State model GS640YBRT 300 natural gas 40 gallon water heater manufactured and installed in 2011. This Honeywell WT8840B1000 replaced the original Honeywell model WV8840B1042. In 2019 mine began to leak dribbling water from the bottom of the Honeywell gas valve itself. (Bad design Honeywell! This should never happen!) Replacing mine is just like the YouTube video others mentioned by searching: Water Heater Gas Valve Replacement. See the Q & A section and other reviews. Here's my helpful tip. The larger gas line to the burner was unbelievably tight. The whole valve flexed where I though it would break off at the part that screws into the tank, even when trying to counter by pulling the gas feed pipe on the opposite side. Solution was to gently wedge in a 5/8" thick piece of wood behind the valve against the tank. In my photo I'm holding the wrench up where the line was attached (loosen by pulling the wrench toward me). Also in the photo I cut fingers off a (blue) disposable glove and put them on the pilot and burner lines to keep them clean. Second photo is old and new valve side by side. There was a crack in the plastic sensor tip responsible for the leak. Newer improved model has metal tip. I used open end or adjustable wrenches for all the fittings. Used vice grip and robo grip pliers for removing the gas feed pipes. Test for gas leaks with soapy water in a spray bottle. Not too difficult for a do-it-yourself person. I took my time working at a slow steady pace, a few hours. The YouTube and included instructions were very helpful. I'm delighted and saved hundreds. Remember to cut off the gas feed valve and drain the tank first.

## Features

- Mounting in the upright position
- Temperature ratings: ambient-- 0 c to 60 c. Inlet/Outlet Size (in.) - 1/2 inch. NPT x 1/2 inch. Inverted Flare. Capacity - Min. 30 ft3/hr, Max. 75ft3/hr
- Pressure regulator setting (psi): 5.0 in. Wc
- Temperature Range: 32 to 150 F
- An included integrated NTC temperature sensor reads water temperature within the appliance up to 221 F (105 C)

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B06XNSV2BG |
| Best Sellers Rank | #43,770 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #47 in Water Heater Replacement Parts #7,338 in Parts & Accessories |
| Brand | Honeywell |
| Date First Available | March 15, 2017 |
| Department | unisex-adult |
| Exterior Finish | Brass" or "Stainless Steel |
| Global Trade Identification Number | 00085267605038 |
| Inlet Connection Type | National Pipe Tapered |
| Is Discontinued By Manufacturer | No |
| Item Weight | 2.2 pounds |
| Item dimensions L x W x H | 8 x 6 x 6 inches |
| Item model number | WT8840B1000 |
| Manufacturer | Honeywell |
| Material | Metal |
| Maximum Operating Pressure | 5 Pound per Square Inch |
| Number of Ports | 2 |
| Outlet Connection Size | 0.5 Inches |
| Outlet Connection Type | Flare |
| Product Dimensions | 8 x 6 x 6 inches |
| Specification Met | Yes, meets relevant industry standards for gas control valves in water heaters |
| UPC | 085267605038 |

## Product Details

- **Brand:** Honeywell
- **Exterior Finish:** Brass" or "Stainless Steel
- **Inlet Connection Type:** National Pipe Tapered
- **Item dimensions L x W x H:** 8 x 6 x 6 inches
- **Material:** Metal
- **Maximum Operating Pressure:** 5 Pound per Square Inch
- **Number of Ports:** 2
- **Outlet Connection Size:** 0.5 Inches
- **Outlet Connection Type:** Flare
- **Specification Met:** Yes, meets relevant industry standards for gas control valves in water heaters

## Images

![Reliance water heater gas control valve 100112336 trade number WT8840B 160 Degree F 1" Cavity made by Resideo - Image 1](https://m.media-amazon.com/images/I/71e3nPR5UTL.jpg)

## Questions & Answers

**Q: will this replace Honeywell model WV8840B1109 ?**
A: According to Honeywell's replacement chart, yes. This should directly replace it.
https://forwardthinking.honeywell.com/related_links/water/water_heater_valve/Installation-Manual-34-00013EF.pdf

**Q: Will this replace a wv8840b1158**
A: i have a Honeywell WT8840B1158 gas water heater 
did this part work for you

thank you jason

**Q: will this replace the wv8840c1604**
A: THis is the model I need to replace, what did you find out??

**Q: How many millivolts does this require?**
A: 750 millivolts this control works with a thermopile not a thermocouple

## Customer Reviews

### ⭐⭐⭐⭐⭐ Worked great
*by C***E on January 9, 2026*

Like new, dropped right in, worked like a charm. Late delivery, but recommend.

### ⭐⭐⭐⭐⭐ Perfect replacement for WV8840B1042
*by J***. on August 16, 2019*

Fit and works perfectly for my State model GS640YBRT 300 natural gas 40 gallon water heater manufactured and installed in 2011. This Honeywell WT8840B1000 replaced the original Honeywell model WV8840B1042. In 2019 mine began to leak dribbling water from the bottom of the Honeywell gas valve itself. (Bad design Honeywell! This should never happen!) Replacing mine is just like the YouTube video others mentioned by searching: Water Heater Gas Valve Replacement. See the Q & A section and other reviews. Here's my helpful tip. The larger gas line to the burner was unbelievably tight. The whole valve flexed where I though it would break off at the part that screws into the tank, even when trying to counter by pulling the gas feed pipe on the opposite side. Solution was to gently wedge in a 5/8" thick piece of wood behind the valve against the tank. In my photo I'm holding the wrench up where the line was attached (loosen by pulling the wrench toward me). Also in the photo I cut fingers off a (blue) disposable glove and put them on the pilot and burner lines to keep them clean. Second photo is old and new valve side by side. There was a crack in the plastic sensor tip responsible for the leak. Newer improved model has metal tip. I used open end or adjustable wrenches for all the fittings. Used vice grip and robo grip pliers for removing the gas feed pipes. Test for gas leaks with soapy water in a spray bottle. Not too difficult for a do-it-yourself person. I took my time working at a slow steady pace, a few hours. The YouTube and included instructions were very helpful. I'm delighted and saved hundreds. Remember to cut off the gas feed valve and drain the tank first.

### ⭐⭐⭐⭐⭐ Good replacement
*by M***R on May 1, 2024*

Same situation as others and needed a replacement. Have an AO Smith water heater about 8 years old. Honeywell controller showing five blinks indicating temperature sensor failure. The replacement took about 1 hour. I turned off the gas in the morning and started draining went I came home from work. Started taking the gas pipe apart starting at the union. That was the hardest part and I suggest using proper pipe wrenches. I used pipe dope and tested gas leaks. Nothing bubbled and no gas smell. Startup was the same. Only difference is the white light vs red in the original. Water has been staying hot and burner starting and stopping properly. There are YouTube videos that helped explain the steps you can see. Hoping this control valve lasts longer. Next is to check the anode rod again next year and drain.

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-16*