---
product_id: 5641935
title: "Rheem SP20172 Flammable Vapor FV Sensor Kit White, 6.7X2.7X9.4 inches"
brand: "rheem"
price: "$53.06"
currency: USD
in_stock: true
reviews_count: 13
category: "Rheem"
url: https://www.desertcart.us/products/5641935-rheem-sp20172-flammable-vapor-fv-sensor-kit-white-6-7x2
store_origin: US
region: United States of America
---

# Digital output for precise detection Compact 6.7x2.7x9.4 in Flange mount for easy installation Rheem SP20172 Flammable Vapor FV Sensor Kit White, 6.7X2.7X9.4 inches

**Brand:** rheem
**Price:** $53.06
**Availability:** ✅ In Stock

## Summary

> 🔥 Stay ahead of hazards with Rheem’s smart sensor kit!

## Quick Answers

- **What is this?** Rheem SP20172 Flammable Vapor FV Sensor Kit White, 6.7X2.7X9.4 inches by rheem
- **How much does it cost?** $53.06 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/5641935-rheem-sp20172-flammable-vapor-fv-sensor-kit-white-6-7x2)

## Best For

- rheem enthusiasts

## Why This Product

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

## Key Features

- • **Trusted OEM Quality:** Genuine Rheem part ensures perfect compatibility and durability.
- • **Top-Rated Reliability:** Join 3,000+ satisfied users with a 4.7-star rating for peace of mind.
- • **Compact & Modern Design:** Slim profile fits seamlessly into your HVAC system without bulk.
- • **Effortless Installation:** Flange mount design and included wire tie make replacement a breeze.
- • **Precision Flammable Vapor Detection:** Keep your HVAC system safe with reliable, digital sensor technology.

## Overview

The Rheem SP20172 Flammable Vapor Sensor Kit is a genuine OEM replacement part designed for HVAC systems. Featuring a compact 6.7x2.7x9.4 inch plastic body, flange mount installation, and digital output, it ensures precise vapor detection and system safety. Highly rated by thousands, this kit includes the sensor, cap plug, and wire tie for quick, hassle-free maintenance.

## Description

Product Description This is a genuine replacement part. The model number and name for the following item is: Rheem SP20172 FV Sensor Kit From the Manufacturer The Rheem SP20172 is an FV sensor kit. HVAC replacement part Rheem SP20172. Get your system working properly once again with replacement parts.

Review: The Genuine Rheem One - Fixed the Flammable Vapor Lockout Error on My Rheem Water Heater - I've had two identical Rheem Platinum 50-gallon water heaters for almost 10 years. Every few years it seems, they shut down and throw a "Flammable Vapor Lockout" error, which is indicated by seven flashes of the blue light on the gas valve assembly. A reset of the unit will usually clear the code. However, when the error starts happening too frequently for my taste, it's time to replace the flammable vapor sensor. This time, I checked the old sensor with a voltage-ohm meter and got a reading of 97,000 ohms resistance. According to Google, the reading should be between 9,000 and 45,000 ohms. So, mine was definitely reading outside the acceptable range, which indicates a failure. I used to contact Rheem and wait several days for them to send me a new vapor sensor under warranty for me to install myself. But, the last two times I just bit the bullet and ordered the sensor on desertcart. For less than $30 (as of 2026) I can have my water heater back up and running within two days (thanks to desertcart's 2-day shipping). The actual brand name of these sensors is ProTech. It's a brand apparently owned by Rheem. So, you're getting the official genuine Rheem part when you order this one. There are at least two cheaper but viable replacement sensors available on desertcart as I write this. One of them is half the price of the Rheem sensor. But I don't recognize the brand names and much prefer the OEM Rheem brand when safety is involved. The new sensor has worked flawlessly since I installed it two weeks ago. Installation takes less than 10 minutes. I'll continue to buy these as long as necessary, rather than bother with the water heater warranty.
Review: Easy replacement - Perfect, our water heater started shut off when turning on the house heater since they are in the same room. The sensor was so easy to change, works perfect. Saved a lot of money doing it ourselves.

## Features

- PLASTIC
- Made in US
- Size: 6.7X2.7X9.4 inches.Includes: FV Sensor (AP13447-3), Cap Plug (AP13450-3), and 6" Wire Tie.
- HVAC replacement part Rheem SP20172.
- Rheem/Ruud replacement FV sensor kit.
- This product replaces the AP13447-3 (this kit includes this sensor)

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00G2DL8M8 |
| Best Sellers Rank | #7,324 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #3 in Water Heater Replacement Parts |
| Brand | Rheem |
| Brand Name | Rheem |
| Customer Reviews | 4.7 out of 5 stars 3,040 Reviews |
| Global Trade Identification Number | 00020352574103 |
| Item Dimensions | 6.7 x 2.7 x 9.4 inches |
| Item Part Number | SP20172 |
| Item Type Name | FV Sensor Kit |
| Item Weight | 0.27 g |
| Item dimensions L x W x H | 6.7 x 2.7 x 9.4 inches |
| Manufacturer | Rheem |
| Material | Plastic |
| Material Type | Plastic |
| Model | SP20172 |
| Mounting Type | Flange Mount |
| Number of Items | 1 |
| Number of Packs | 1 |
| Output Type | Digital |
| Part Number | SP20172 |
| Specific Uses For Product | HVAC system maintenance and repair |
| Style | Modern |
| Style Name | Modern |
| UPC | 662766396171 020352574103 785971458424 |
| Unit Count | 1 Count |
| Upper Temperature Rating | 122 °F |

## Product Details

- **Brand:** Rheem
- **Item dimensions L x W x H:** 6.7 x 2.7 x 9.4 inches
- **Material:** Plastic
- **Item Weight:** 0.01 Ounces
- **Style:** Modern

## Images

![Rheem SP20172 Flammable Vapor FV Sensor Kit White, 6.7X2.7X9.4 inches - Image 1](https://m.media-amazon.com/images/I/51Au2d2F1AL.jpg)
![Rheem SP20172 Flammable Vapor FV Sensor Kit White, 6.7X2.7X9.4 inches - Image 2](https://m.media-amazon.com/images/I/61fXDDOUgcL.jpg)
![Rheem SP20172 Flammable Vapor FV Sensor Kit White, 6.7X2.7X9.4 inches - Image 3](https://m.media-amazon.com/images/I/61leASBWnQL.jpg)
![Rheem SP20172 Flammable Vapor FV Sensor Kit White, 6.7X2.7X9.4 inches - Image 4](https://m.media-amazon.com/images/I/410kF2VgQGL.jpg)

## Questions & Answers

**Q: Will this fit my richmond water heater model #6gr50pve2-42?**
A: Hi Kathy-Chances are you may only have to reset the vapor sensor currently in your water heater.I presume that the water heater control is a honeywell.
Flip the on/off button to OFF.Turn the thermostat knob to LOW.Unplug water heater and then plug back in.Turn the on/off switch to ON.Turn the 
thermostat knob fully HI and back to fully LOW seven times.The water heater should now be reset and turn on.If this fails,google "RHEEM SP20172
VAPOR SENSOR" and click on any of the RESET or REPLACE topics.

**Q: Will this work for 7201 in Intelli Vent?**
A: Yes sir

**Q: My faulty fv sensor shows 7202, t-o-d, 25vs. will this work?**
A: Most likely it will.  Keep searching around to find the range of ohms it is supposed to read before it tells the gas to turn off.  The other thing would be to go to the local appliance parts store and just get the one they have there for the immediate fix.  Your time spent searching is basically worth the price difference.

**Q: Will this work on a Lochinvar lvnl041g with the replacement part tst1027?**
A: Hello. Thank you for the message. We do not have a database for the Lochinvar. However, if your old part number is TST1027, then this item will be compatible. Please let us know if you have any additional questions. Thank you!

## Customer Reviews

### ⭐⭐⭐⭐⭐ The Genuine Rheem One - Fixed the Flammable Vapor Lockout Error on My Rheem Water Heater
*by M***C on August 5, 2026*

I've had two identical Rheem Platinum 50-gallon water heaters for almost 10 years. Every few years it seems, they shut down and throw a "Flammable Vapor Lockout" error, which is indicated by seven flashes of the blue light on the gas valve assembly. A reset of the unit will usually clear the code. However, when the error starts happening too frequently for my taste, it's time to replace the flammable vapor sensor. This time, I checked the old sensor with a voltage-ohm meter and got a reading of 97,000 ohms resistance. According to Google, the reading should be between 9,000 and 45,000 ohms. So, mine was definitely reading outside the acceptable range, which indicates a failure. I used to contact Rheem and wait several days for them to send me a new vapor sensor under warranty for me to install myself. But, the last two times I just bit the bullet and ordered the sensor on Amazon. For less than $30 (as of 2026) I can have my water heater back up and running within two days (thanks to Amazon's 2-day shipping). The actual brand name of these sensors is ProTech. It's a brand apparently owned by Rheem. So, you're getting the official genuine Rheem part when you order this one. There are at least two cheaper but viable replacement sensors available on Amazon as I write this. One of them is half the price of the Rheem sensor. But I don't recognize the brand names and much prefer the OEM Rheem brand when safety is involved. The new sensor has worked flawlessly since I installed it two weeks ago. Installation takes less than 10 minutes. I'll continue to buy these as long as necessary, rather than bother with the water heater warranty.

### ⭐⭐⭐⭐⭐ Easy replacement
*by K***R on March 7, 2026*

Perfect, our water heater started shut off when turning on the house heater since they are in the same room. The sensor was so easy to change, works perfect. Saved a lot of money doing it ourselves.

### ⭐⭐⭐⭐⭐ Perfect for Rheem
*by D***N on June 14, 2026*

Worked perfectly on my Rheem. There is another on this site that shows the same part number but will not work on Rheem hot water heaters, Don't buy it. You will be disappointed. buy this one. It works perfect

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-08-18*