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Rheem Products

Rheem RTG84XP

RTG84XP Outdoor Whole House Tankless Water Heater, 8.4 GPM Liquid Propane
★★★★★ ★★★★★

RTG84XP Outdoor Whole House Tankless Water Heater, 8.4 GPM Liquid Propane


Items that are currently in-transit to our warehouse, are currently in-stock at a drop-ship vendor’s, or manufacturer's warehouse will be marked as "Available". These products will ship once your order is processed (usually within 24-48 business hours). For any exceptions to this timeframe, an ETA (Estimated Time of Arrival) for your order will be emailed with accurate shipping dates in order to ensure that you are always updated and informed as to when your order will arrive at its final destination.

Quick Specs: View More

  • Energy Star: Yes

Enter zip code for delivery ETA and promotions:


Includes Outdoor Natural Gas Tankless Water Heater for 2-3 Bathroom Homes Available at AppliancesConnection


  • 6.7 GPM at a 45 degrees F temperature rise (up to 8.4 GPM at 35 degrees F)
  • Exclusive! Guardian SBT sensing burner technology
  • Next generation burner technology
  • Exclusive! Guardian OFW overheat film wrap
  • Digital display on thermostat shows temperature setting and maintenance/error codes


  • Depth:  9.875"
  • Direct Vent:  No
  • Duct Size:  Ductless
  • Energy Star:  Yes
  • Gas Connection:  0.75
  • Hardwired:  Yes
  • Height:  25.625"
  • Ignition Type:  Electronic
  • Indoor Installation:  No
  • Low Lead Compliant:  Yes
  • Manifolding:  Yes
  • Maximum Flow Rate:  8.4
  • Maximum Gas Input:  180000
  • Maximum Temperature:  140
  • Minimum Flow Rate:  0.26
  • Minimum Gas Input:  11000
  • Outdoor Installation:  Yes
  • Plug In:  Yes
  • Water Connection:  0.75
  • Width:  13.875"

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Overall Rating ☆☆☆☆☆ ★★★★★ 4.4
Ease of Use 4.4
Meet Expectations 4.4
Bang for Your Buck 4.4
Average rating out of 5 reviews

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Customer Reviews

Good features

By  from Myrtle Beach, SC, United States
Overall Rating: ☆☆☆☆☆ ★★★★★ 3

I bought this two months ago and I'm having nothing but problems.

Written by a customer while visiting


By  from Fresno, CA, United States
Overall Rating: ☆☆☆☆☆ ★★★★★ 4

Recommended Product:

It takes a while for the water to get hot but once it is hot you do not run out of the awesome hot water.

Written by a customer while visiting

Easy installation and great tech support

By  from San Antonio, TX, United States
Overall Rating: ☆☆☆☆☆ ★★★★★ 5

Recommended Product:

I've just had this a few days, but we already love it. I installed it myself in place of a tank-type gas heater. I purchased the valve package and vent which made for a relatively easy job. It wouldn't start up after completion, but after consulting tech support (great guys!) I discovered that the house had been plumbed with the hot and cold water pipes switched in position. With a quick change to the pex pipes it immediately kicked off and away we went. Wait time for hot water is about the same as the old tank type. I can imagine how impressive the savings will be because 99+% of the time, the unit is off.

Written by a customer while visiting

Still running perfectly after 2 years..

By  from North Carolina
Overall Rating: ☆☆☆☆☆ ★★★★★ 5

Recommended Product:

I self-installed this unit 2 years ago to replace a 40 gallon electric tank heater, and I couldn't be happier! My natural gas cost is significantly less than what I previously paid to heat the same amount of water, and I never worry about running out of hot water. I installed 3 Remote Controls for added convenience. The unit runs quietly and smoothly, firing every time I need it with no problems whatsoever. My city water supply is soft and clean, so it wasn't surprising that my recent vinegar flushing revealed no evidence of lime or scale deposits. My decision to self-install was based on minimizing initial cost, thus hoping long-term cost payback through operational savings might be realized. Based on the high cost of professional installation in my area, payback through savings would likely never be possible, as their labor rates seemed to over-double while quoting on tankless. My cost of installation was still quite expensive after buying the necessary vent piping, tubing, fittings, etc., but now that it's done, replacing the unit at its end-of-life will be easy and even more cost effective. For anyone considering self-installing one of these, I strongly recommend reading the manual multiple times and knowing the relevant local codes in your area. Plan ahead, don't rush, and sweat all the details, especially those concerning gas supply, water supply, and venting. Only use recommended venting materials! If you need to, sub out those portions of the work you may lack competency or tooling to do. It's much wiser to pay an experienced professional an hour or two labor to make your gas line connections, than to end up with a deadly gas leak. I consulted with a local licensed plumber and city inspector to make sure my installation met all requirements and was safe. Last, do a neat and clean job. If you follow all necessary requirements, you should end up with a system that operates perfectly. I highly recommend this unit.

Written by a customer while visiting

Tankless Water Heater

By  from Spring, TX, United States
Overall Rating: ☆☆☆☆☆ ★★★★★ 5

Recommended Product:

Purchased just a couple of weeks ago. Performance has been flawless and installation was easy according to the plumber. Water temperature / function panel was extended to a location very easy to see and monitor each day.

Written by a customer while visiting
1-5 of 5


  • Brand:Rheem
  • UPC:020352591445
  • Stock Id:231234
  • Product Number:RTG84XP


  • Fuel Type:Liquid Propane


  • Width:13.875"
  • Depth:9.875"
  • Height:25.625"

    Technical Details

  • Energy Star:Yes
  • Ignition Type:Electronic
  • Duct Size:Ductless
  • Direct Vent:No
  • Maximum Flow Rate:8.4
  • Gas Connection:0.75
  • Maximum Gas Input:180000
  • Maximum Temperature:140
  • Minimum Flow Rate:0.26
  • Minimum Gas Input:11000
  • Hardwired:Yes
  • Weight:57.00 lbs