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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 77 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Wednesday, Mar 11
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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: Wednesday, Mar 11

This item is non-returnable:

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

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • 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

    • Works Great
Size: 8.4 GPM Color: Gray
I did not install it myself, so I cannot comment on the installation. The tankless water heater is working perfectly. It takes a bit longer than I expect to get the hot water, but it is a common problem of the tankless water heater. Once the hot water is running, it just continuously deliver the hot water. ... show more
Reviewed in the United States on November 7, 2025 by Hands on Reviewer
    • Great item was very easy to install
Size: 7.0 GPM Color: Gray
Works great should of had it years ago. Will never be without one again.
Reviewed in the United States on November 21, 2025 by Gerald L Hash
    • Works perfectly
Size: 7.0 GPM Color: Gray
After struggling with a Marey for 4 years, we tore it out and installed this one...from the first day, it has worked beautifully.
Reviewed in the United States on October 26, 2025 by Elaine V. Phipps
    • Working Great
Size: 7.0 GPM Color: Gray
works great. heats as expected and does not have issues when gas is turned off and turned back on as some systems do.
Reviewed in the United States on October 20, 2025 by Joshua Helmle
    • Defective unit.
Size: 7.0 GPM Color: Gray
This water heater was defective straight out of the box. It sat for two months before I could have it installed therefore, I was unable to return it, even though it was brand new. I ended up having just to throw it in the trash. I would never buy this brand of water heater ever again or from Amazon ever again. ... show more
Reviewed in the United States on September 20, 2025 by Scott Walker
    • Hot water for a long period
Size: 7.0 GPM Color: Gray
Excellent service
Reviewed in the United States on August 6, 2025 by Michael Patterson
    • Tankless requires to wait a few seconds for the hot water
Size: 7.0 GPM Color: Gray
Easy to install, reliable, and costs less than installing a tank water heater and uses less energy.
Reviewed in the United States on October 16, 2025 by Mauricio C.
    • Hot water fast
Size: 7.0 GPM Color: Gray
Better than old type saves water hot water fast
Reviewed in the United States on October 16, 2025 by Jean

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