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Rheem RTG-64XLP 6.4 GPM Low NOx Outdoor Tankless Propane Water Heater

3.7 3.7 out of 5 stars 67 ratings

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Brand Rheem
Voltage 120 Volts
Capacity
6.4 Gallons
Power Source
Wind Powered
Item Weight
38 Pounds
Style
Industry,Outdoor

About this item

  • Propane Tankless Water Heater
  • Outdoor
  • 6.4 gal/min. at 35 Degree Rise
  • UMC-117 remote control and 10-Feet of thermostat wire is included
  • Low Nox Version
  • Propane Tankless Water Heater
  • Outdoor. 5.6 gal/min at 45 degree F rise

Customer ratings by feature

Easy to install
4.7 4.7
Remote Control
4.5 4.5
Value for money
4.2 4.2
See all reviews

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here [PDF ]

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Rheem RTG-64XLP 6.4 GPM Low NOx Outdoor Tankless Propane Water Heater

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Product Description

Product Description

Rheem RTG-64XLP Outdoor Propane Tankless Water Heater Residential Tankless Water Heaters - Rheem tankless gas water heaters offer you the perfect solution to heat your water at home. Imagine never running out of hot water again. Rheem provides to you innovative, new tankless products that provide a continuous supply of hot water from energy efficient and space saving design units. Specifications - 6.8 gal./min. at 35-Degree F rise max. - 5.3 gal./min. at 45-Degree F rise max.Features: Outdoor Installation Only. - New! Next Generation Burner Technology - Industry Best! .26 GPM Minimum Flow Rate, .40 GPM Minimum Activation Flow Rate - UMC-117 remote control and 10-Feet. of thermostat wire is included - EZ-Link cable available for high demand applications to connect two tankless units to operate as one - New, Manifold up to 6 units with an optional MIC-6 manifold control board - Exclusive.

From the Manufacturer

Rheem RTG-64XLP Outdoor Propane Tankless Water Heater Residential Tankless Water Heaters - Rheem tankless gas water heaters offer you the perfect solution to heat your water at home. Imagine never running out of hot water again. Rheem provides to you innovative, new tankless products that provide a continuous supply of hot water from energy efficient and space saving design units. Specifications - 6.8 gal./min. at 35-Degree F rise max. - 5.3 gal./min. at 45-Degree F rise max.Features: Outdoor Installation Only. - New! Next Generation Burner Technology - Industry Best! .26 GPM Minimum Flow Rate, .40 GPM Minimum Activation Flow Rate - UMC-117 remote control and 10-Feet. of thermostat wire is included - EZ-Link cable available for high demand applications to connect two tankless units to operate as one - New, Manifold up to 6 units with an optional MIC-6 manifold control board - Exclusive.

Top Brand: Rheem

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Important information

Bulb Voltage

120 volts

Customer reviews

3.7 out of 5 stars
3.7 out of 5
67 global ratings

Customers say

Customers like the quality, temperature and value of the water heater. For example, they mention it works perfectly, heats enough water for a shower, 2 sinks, and a washing machine to run at the same time, and it saves them lots of money. They appreciate the ease of installation, saying the well-written instructions and YouTube videos gave them the confidence to install.

AI-generated from the text of customer reviews

30 customers mention28 positive2 negative

Customers are satisfied with the quality of the water heater. They mention that it works great, runs perfectly, and is well made. Some say that the propane tanks last pretty long and are great ideas for apartments, lake houses, and small homes.

"...What a difference this Tankless hot water heater has made. It worked flawlessly as soon as I turned on the propane and the power...." Read more

"...ran from an off grid inverted DC/AC electrical system and works perfect in that regard...." Read more

"...But it looks solidly built, high-grade connections.Complete, well-written instructions helped a lot...." Read more

"Ok? It does the job as expeded." Read more

10 customers mention10 positive0 negative

Customers are satisfied with the temperature of the water heater. They mention that it heats enough water for a shower, 2 sinks, and a washing machine to run at the same time. They appreciate the regulated heat, saying that there is not a drastic drop in heat. They also say that the temperature output is very steady. Overall, customers are happy with the quality and performance of this product.

"...This was about a month ago. Continuous hot water in the shower...." Read more

"...is running the kitchen sink while I take a shower, there is not a drastic drop in heat. It stays relatively close...." Read more

"...The temperature output is very steady, unlike the previous Aquastar...." Read more

"...My plumber did an awesome job installing it and I love the unending hot water. The true test will be when I have guests and they use the shower...." Read more

10 customers mention10 positive0 negative

Customers are satisfied with the value of the water heater. For example, they mention it's the cheapest price around, it saves them lots of money, and it'll cut their gas bill about three quarters.

"...cylinder of gas lasts almost 9 months before installation, the cost will be minimal though the environmentalists would be looking at the carbon..." Read more

"...No complaints of running out. Also it has cut my gas bill about three quarters...." Read more

"...The installation is easy and I notice a drop in my electric bill. The propane consumption is low...." Read more

"Great product and cheapest price around. We have fast hot water for less money since it's tankless. My husband installed it in a few hours...." Read more

8 customers mention8 positive0 negative

Customers find the installation of the water heater to be easy. They appreciate the well-written instructions and YouTube videos that provide additional information.

"...Installation is not difficult once you do your homework.It took me a full day to complete the installation...." Read more

"...Complete, well-written instructions helped a lot...." Read more

"...Very well made, and easy to install, but if you are installing yourself, do yourself a favor, GET THE INSTALL KIT!!!! It comes with flush valves...." Read more

"...old. These heaters are great and so easy to install...." Read more

3 customers mention3 positive0 negative

Customers are satisfied with the propane use of the water heater. They mention that it has a very low propane use and a tremendous decrease in their electric bill.

"...After my personal installation, I've seen a tremendous decrease in my electric bill by almost $200...." Read more

"...The propane consumption is low...." Read more

"...Sooo much better than the tanks we used to have and very low propane use." Read more

lasted 8 yrs
2 Stars
lasted 8 yrs
Was nice. Kinda. Had to leave the tub filler partially running to take a shower to keep water flow high enough for this thing to stay on. Every nearby lightning strike would pop a .2amp fuse in the it that needed replaced. Bought it due to it's corrosion resistance but the copper lines deep inside started spewing at the 8 year mark, shorting out all the pc board inside then giving me a happy shock. Going back to a simple tank heater with a pilot that will rot out in 4 years that delivers hot water no matter how much or little the faucet is open or shuts itself off begging to be flushed out or pops dinky fuses or jyst refuses to work some days for no conceivable reason. Tankless seemed like a good idea. Learned it is a headache instead.
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Top reviews from the United States

Robert Soutar
5.0 out of 5 stars Good installation Experience
Reviewed in the United States on February 11, 2017
Verified Purchase
I purchased this for my mobile home in Florida. Some of the other homes here have replaced their old 10 gallon tanks with tankless units. I installed it on my own after receiving quotes from plumbers which were in the area of $1400.00 including propane gas hookup. There are plenty of YouTube instruction videos, which gave me the confidence to give installation a shoot. Also speaking with neighbors that had done it themselves, and offered to help me. Installation is not difficult once you do your homework.

It took me a full day to complete the installation. What a difference this Tankless hot water heater has made. It worked flawlessly as soon as I turned on the propane and the power. This was about a month ago. Continuous hot water in the shower. We can run the washing machine, take a shower and use the kitchen sink at the same time without any heat loss.

Make sure you purchase the proper brass connectors so that you can properly de-scale the tankless system.
3 people found this helpful
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Wilderpeople
2.0 out of 5 stars Hot water, just as implied - OR NOT! UPDATE
Reviewed in the United States on May 18, 2015
Verified Purchase
Bought this for our mobile home that happens to be small with the trend these days. This is being ran from an off grid inverted DC/AC electrical system and works perfect in that regard. Installed it myself, which had some lessons I'd like to detail.

First, get the right size gas line. I am running off a 20lb LP bottle, regulated by a generic 11" W.C. This feeds a 24" long 7/8" (nut size) hose, with a 3/4" volume diameter. I am at approximately 6500' elevation. Yes, elevation is a factor. If you are above 9500', you will need a technician to adjust it; which really is a different chip controller they install. Otherwise, works fine on this rig.

Second, you must get the right inlet/outlet controls and blow off valve. This did not come with one, so I had to go to a plumbing supply to get this. It's easier to use the kit pieces than trying to make up your own deal; but you will be set back another $120. Then you'll also need your line connections. Your application will vary.

Third, water pressure wasn't an issue, but I wanted to mention it. It is one of the lowest required, so you'll need at least a 20psi (~0.24 gal/min) load to have it operate. Just to ignite you'll need 0.40 gal/min. So if you have low flow heads on your faucets, you may need to remove/change them or up your pressure somehow.

Fourth, if you are expecting anything greater than 120 degrees out of the box, forget it. That requires, again, a technician to adjust. The max range is 120 to 145 degrees that they can make happen. Supposedly a commercial application will go to 185 degrees, but I don't know if that's the capabilities of just one heater or two tied together.

As for the use, if I had the outer lines wrapped in an insulating shield, the water would likely be hotter faster than just bare pipe exposed. With that said, exposed pipe gets me (at 120 degree setting) hot water in less than 10 seconds. In about a minute in a shower your skin will be cherry red from the highest setting.

I only am running a kitchen sink, shower and washer as of now. I will only be adding a bathroom sink yet. If my wife is running the kitchen sink while I take a shower, there is not a drastic drop in heat. It stays relatively close. My washer is too efficient, so I don't notice any changes with it. I think it might have a secondary heater element within it, so that might answer the question.

Other than that, you'll likely never reach customer service if you want help. But the internet has a lot of resources if you want to figure things out on your own. In general, a good machine that does the job required for our application.

1/20/2019 ****************
UPDATE

I do not advise purchasing any Rheem on-demand HW heaters. Simply put, in extremely cold environments, these fail to meet specifications. Components, like plastic injection molded (2-piece) controllers or diverters, freeze and crack. The ceramic heater elements are only on portions of copper lines. I double insulated inside and out and still had freeze cracking.

After a 3rd catastrophic repair, done myself, I have concluded that these need a redesign. They may work in more equatorial environments. But above the 38th parallel North, I caution you.
16 people found this helpful
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Ames Gilbert
5.0 out of 5 stars Excellent heater
Reviewed in the United States on April 28, 2014
Verified Purchase
I bought this to replace my 13-year old Aquastar 125; the control interlocks in that wore out, and I couldn't find spares, nor could I find an exact replacement. I saved significant money by buying one that had been returned to Amazon for some reason, and it was in perfect, unused condition.
Know that this model of Rheem heater must be placed on the outside of the building; the vent on top exits directly to the outside, not through any kind of chimney. Rheem does sell an inset kit that allows you to inset it so the front is flush with the outside wall, however. I did not use this kit, but made my own arrangements, using the clear instructions about clearances provided.
Once I re-routed all the existing plumbing and provided a GFI outlet for power, I had to drill a small hole for the wiring for the remote control, which lives indoors.
The innards are incredibly complicated compared to the previous all-mechanical Aquastar, lots of circuit boards, wiring, fans, etc. But it looks solidly built, high-grade connections.
Complete, well-written instructions helped a lot.
Tested everything (gas connections several times over a period of several days, looking for leaks), turned on the power, and ran the water. Perfect the first time. I pump water from my own well, so the pressure fluctuates much more than city water. The temperature output is very steady, unlike the previous Aquastar.
The factory water temperature is limited by the controller to 120 degrees. You must manually re-program the controller to get higher temperatures. For me, 120 is too low for satisfactory showers (relaxing after hard physical work), so I'm trying 125 degrees. I understand, Rheem is making sure that if you intentionally bypass the factory settings, it is your deliberate choice, and you are assuming any risks of scalding.
31 people found this helpful
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Bob Statham
4.0 out of 5 stars Four Stars
Reviewed in the United States on December 2, 2015
Verified Purchase
Ok? It does the job as expeded.
One person found this helpful
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Seabreeze!
5.0 out of 5 stars Rheem Tankless Propane Heater - Fantastic
Reviewed in the United States on November 17, 2018
Verified Purchase
Some persons might say it's crazy to move from a solar water heater to a tankless water heater but that has been a personal choice due to poor customer service. I am sooo happy with my Rheem RTG-64XLP Propane heater. Since they're only two persons in the house and a100-lb cylinder of gas lasts almost 9 months before installation, the cost will be minimal though the environmentalists would be looking at the carbon footprint. It was installed 7 months ago and has worked perfectly since then. It is the outdoor unit placed under the house and there are no ventilation or fire hazard issues since the surrounding area is all brick work. I also installed a Webstone service valve kit and will be servicing it soon since I'm in a hard water area. Love it so much, I'm sorry I didn't purchase the RTG-84XLP instead.
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Top reviews from other countries

Luc L.
5.0 out of 5 stars Installed and works like a dream
Reviewed in Canada on December 4, 2016
Verified Purchase
On time delivery. Installed and works like a dream. Easy to install.
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E Knox
5.0 out of 5 stars Five Stars
Reviewed in Canada on July 7, 2014
Verified Purchase
Works beautifully so far and at low water volumes.
2 people found this helpful
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Don Wood
4.0 out of 5 stars The perfect solution for our needs!
Reviewed in Canada on October 27, 2013
Verified Purchase
This product came highly recommended by a tradesman who installed one on his Park Model at a seasonal resort. I will install mine in the spring when we go to open our residence for the season.

I am looking forward to the savings going from electricity to propane and the (unlimited) availability of hot water for our family for showers and bathing.

Be sure to look for the (alternate) hardware designed for this product for ease of installation. The ready to use hot and cold water fittings, complete with pressure relief value and drain plugs is a must. I also purchased the pipe cover so that when it is all complete on the outside of our home, nothing will be visible.
One person found this helpful
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