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Rheem

Rheem RTG-84XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater 8.4 GPM, 180,000 BTUs

  • Based on 76 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Nov 17 – Nov 18
Order within 15 hours and 36 minutes
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Size: 8.4 GPM


Color: Gray


Features

  • High-efficiency tankless gas water heater delivers up to 8.4 GPM, perfect for 23 bathroom homes with multiple hot water needs like showers and laundry.
  • Powered by natural gas with 180,000 BTUs, this durable tankless unit ensures fast, reliable hot watereven during peak household demand.
  • Designed for outdoor installation, this high-efficiency tankless natural gas water heater features a durable metal cabinet and supports easy wall mounting by a qualified installer.
  • Hot-start programming prevents cold water bursts, making this tankless natural gas water heater ideal for back-to-back showers.
  • Rheem RTG tankless gas water heaters offer high-efficiency, space-saving designs with multiple models to fit any home size, fuel type, and hot water demand.

Description

Rheem’s RTG-84XLN-3 High Efficiency outdoor non-condensing natural gas tankless gas water heater delivers continuous hot water with minimal wait, saving time, energy and water. The RTG-84XLN-3 features exclusive Hot Start Programming which keeps the water heater in a ready state eliminating cold water bursts with back-to-back uses. Rheem’s exclusive Overheat Film Wrap provides heat exchanger overheat protection providing you peace of mind while you enjoy efficient, continuous, no wait hot water in your entire home. The compact size, wall mount and industry leading installation clearance allows for installation in small spaces, saving valuable floor space.

Brand: Rheem


Product Dimensions: 13.5"W x 20.75"H


Color: Gray


Maximum Flow Rate: 8.4 Gallons Per Minute


Maximum Temperature: 140 Degrees Fahrenheit


Brand: ‎Rheem


Product Dimensions: ‎13.5"W x 20.75"H


Color: ‎Gray


Maximum Flow Rate: ‎8.4 Gallons Per Minute


Maximum Temperature: ‎140 Degrees Fahrenheit


Efficiency: ‎GAMA efficiency certified


Style: ‎Outdoor Installation


Mounting Type: ‎Wall


Is Electric: ‎No


Manufacturer: ‎Rheem


Item Depth: ‎9.4 inches


UPC: ‎020352761268


Part Number: ‎RTG-84XLN-3


Item Weight: ‎39.2 pounds


Item model number: ‎RTG-84XLN-3


Size: ‎8.4 GPM


Item Package Quantity: ‎1


Included Components: ‎Display


Batteries Required?: ‎No


Date First Available: October 23, 2023


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Nov 17 – Nov 18

This item is non-returnable:

Non-returnable. Transportation of this item is subject to hazardous materials regulation

View our full returns policy here.

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  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • Replaced older model.
Size: 9.5 GPM Color: Gray
After about 10 years, the older model quit on us. This was a direct replacement. It came per-configured and worked right out of the gate. I would recommend using a certified plumber to install because you are dealing with GAS lines. You want to make sure things are done right.
Reviewed in the United States on June 1, 2025 by genobpgh
    • Compact and quiet
Size: 9.5 GPM (WiFi) Color: Gray
This unit replaced a Bosch tankless water heater that was not keeping a consistent temperature. This unit is smaller, quieter, programmable, and does the job for us.
Reviewed in the United States on June 1, 2025 by Carl Jerris
    • Replacing electric water heater
Size: 7.0 GPM Color: Gray
Installed this to transition my water heating to gas for economy. This unit hung on the basement wall and didn't require an enclosure except for some sheet metal to encase the feed pipes. Original heater was left in place and valved off as a backup. This unit produces a nice flow of hot water that continues until you shut the water off. It takes a bit longer to heat up due to the gas startup and the added 12' of piping which is to be expected, but it is only about 5 to 10 seconds depending on which faucet is being used. It only runs when the water is turned on, so no tank heating is required. I think it is going to save me a noticeable amount on my electric bill even after the gas bill hits. ... show more
Reviewed in the United States on January 4, 2025 by L. Smith
    • Seller send broken unit.
Size: 9.5 GPM Color: Gray
Seller send us an open package and when checked we find that the unit was broken, unable to use due to safety protocol from the manufacturer. After returning the product seller issue refund immediately.
Reviewed in the United States on April 4, 2025 by Lazardo700
    • Bad ass
Size: 7.0 GPM Color: Gray
Easy hook up, for replacement water heater on my house
Reviewed in the United States on February 16, 2025 by Cade morris
    • Works well
Size: 7.0 GPM Color: Gray
Good but delivery ain’t so good l. Was already opened when I got it which was odd but it does really work
Reviewed in the United States on February 24, 2025 by Andy Li
    • Happy customer
Size: 9.5 GPM Color: Gray
We bought this for a customer and installed. They were very happy with the water heater. We did have a little trouble finding the correct cover for the pipes because that doesn’t come with it, but we eventually found it and the customer was very satisfied with the water heater.
Reviewed in the United States on November 16, 2024 by Mojogirl75
    • Works very well
Size: 9.5 GPM (WiFi) Color: Gray
My old one was broken and instead hire someone to install a new one and paying 5000 dollars, I decided to do it by myself! It works very well.
Reviewed in the United States on December 11, 2024 by Amazon Customer

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