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Rheem RTGH-95XLN Review (January 2024) ~ Tankless Water Heaters

Rheem Rtgh-95xln At A Glance

Top Perk > Amazing Efficiency

Rheem RTGH-95XLN Prestige Natural Gas Outdoor Whole House Low NOx Condensing Tankless 9.5 GPM Water Heater
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If you are tired of managing a heating unit that cannot keep up with all of your hot water demands, then there’s no better time to make a transition than now. The Rheem RTGH-95XLN Prestige tankless water heater is one of the best (if not the best) solution in the market today. This unit possess an amazing efficiency that quickly distinguishes from similar products in the same category. It comes with a massive water flow rate of 9.5 gallon per minute which ensures you get enough hot water for to meet all your demands. There are other amazing features this unit a good take, especially a 10-year warranty that puts your mind to rest. Believe it or not, you can never go wrong with a unit like the Rheem RTGH-95XLN.

  • 9.6/10
    Efficiency - 9.6/10
  • 9.4/10
    Ease of Use - 9.4/10
  • 9.6/10
    Value - 9.6/10
  • 9.6/10
    Features - 9.6/10

Rheem RTGH-95XLN

  • Cost: $$$$
  • Model Number: RTGH-95XLN
  • Weight: 78.3 pounds
  • Size: 18.5 x 9.8 x 27.5 inches
  • Water Flow Rate: 9.5 gallon per minute (GPM)
  • Type of Unit: Outdoor
  • Fuel Type: Natural Gas
  • Energy factor: 0.94
  • Similar model: RTGH-85XLN
  • Warranty: Residential: Standard 10 year warranty



Over the last few years, the tankless hot water heater has become increasingly popular as one of the most important commodities in a household. It comes with a design which eliminates the bulky tanks common with traditional tanked heaters and employs a heating mechanism which makes it more powerful and efficient. More importantly it provides hot water on demand and doesn’t skyrocket your monthly energy bills.

Considering the huge number of tankless heaters on the counter, finding one to meet you household’s specific needs can be overwhelming especially if you have no experience with such appliances. Fortunately, there are certain brands in the market that have been able build a strong reputation in delivering quality tankless water heaters. Rheem is one of such brands and the Rheem RTGH-95XLN water heater is one of their best products so far. Of course we came to this conclusion after examining all the top tankless heaters from the company.

The Rheem RTG-84XLN is a perfect choice if you are hoping to save from the high-end models. It is probably the best outdoor tankless water heater from Rheem. You can rely on its durability and capacity to deliver hot water on demand regardless of your family size.

This appliance comes with an impressive flow rate of 9.5 GPM with a consumption of 180k BTU, which makes it suitable for many (large to medium sized) households especially in the U.S. It has a rated efficiency that is superior to most of its competitors while its emissions are very low. This makes it pretty safe and environmentally friendly even though it’s meant to go outside the house. Don’t forget to check your pipe sizes before purchase or at better still, you can opt for new pipes.

At normal flow rate, the heater can deliver to up to 3 bathrooms simultaneously. This is not uncommon especially during winter when the weather is almost always chilly. If you are living in a house that has 3 bathrooms, then this product will make a great choice.

There are other amazing features this unit a good take, especially a 10-year warranty that puts your mind to rest. Believe it or not, you can never go wrong with a unit like the Rheem RTGH-95XLN.

We strongly believe that the RTGH-95XLN is the best heating unit for mobile applications on the counter, which is why we have it listed in our choice of the best tankless heaters available in the market today.


The Rheem RTG-95XLN has a low fixture compatibility which enables it to supply hot water even in hot demand situations. The rated minimum and activation flow rates are 0.26 GPM and 0.40 GPM respectively. With such a configuration, you can be certain of an almost endless supply of hot water anytime you need it, no matter how long, a low water condition notwithstanding.

So no hurrying up your cooking, laundry, or bath, just because the water heater hasn’t got enough water. With the Rheem RTG-84XLN, you can have constant supply of hot water as long as you you need it, and you don’t have to wait too long.

Interesting, this device can produce up to 8 gallons of water per minute or even more; which is more than enough for a family of 4 or 5.

The actual gallon capacity of the Rheem RTG-95XLN is 9.5 GPM. So besides providing water for your whole family, this unit can also supply water to multiple faucets simultaneously. In order words, you can use 2 or 3 bathrooms at the same time without worrying about any fluctuation in the water flow.

Additionally, the internal heaters of the unit are configured in such a way that prevents cold from getting in. In order words, you won’t have to worry about the pipes getting blocked whenever the weather is chilly for long. WTM is used to guard the heat film wrap.

As expected with all Rheem models, the Rheem RTG-84XLN can be linked in up to 20 units. And is also configured to allowing water saving.

You can actually save up to 1,100 gallon of water in one year by reducing the water flow to the point where the temperature is equivalent to the set temperature of the unit.


One of the most fascinating things about the Rheem RTG-95XLN is that it allows you to be able to get hot water at first touch. However, this is not often the case with many tankless water heaters due to the time lag in activation rate. The burners of such systems only starts to heat after detecting flow and this consequently delays the water from coming out instantly.

One of the easiest ways you can avoid such delays is to pair up the unit with a re-circulation pump kit. Unfortunately, not every tankless heater in the market can seamlessly “blend in” with the kits currently on display in the market.

Luckily, the Rheem RTG-95XLN can be used with a re-circulation pump kit which allows you to enjoy the full performance of the appliance. This way, you will be able to get hot water the moment you open your faucet.

Another unique feature that makes the Rheem RTG-95XLN more efficient is that it gives you the ability to control the temperature of the water coming out.

This device comes with intelligent electronic controls which includes a digital display meter that allows you to set temperature to your preferred choice and adjust the water flow rate to make sure there’s no fluctuation in the water temperature. This ultimately resolves the sandwich problem of frequently switching the heater and waiting for cold water to get warm while you get frosty.

The Rheem RTG-95XLN is also equipped with all-copper heat exchanger to ensure greater heat transfer and exchanger.


The Rheem RTG-95XLN is equipped with a self-diagnostic system that reduces the hassle in installation and makes maintenance much easier. Like other outdoor tankless heaters, this unit doesn’t require venting. This should be a big plus for you especially when you also consider the fact you don’t have to worry about gas combustion since the heater is located outside the house.

If you have any DIY skill set at all, then you should find the Rheem RTG-95XLN pretty easy to install since no venting is required; although you may still encounter some problems along the way if you live in location that is frequently chilly. Anyway, that’s just by the way.

Generally, you shouldn’t spend much time hooking up this unit on your own if you are careful enough to follow every step on the instruction manual. Clear graphical illustrations are provided; though you can still see the tutorial video if you wish to.

But at the end of the day, you can hire a plumber for a few bucks if you have any doubt about taking up the set-up all by yourself. Perhaps working out the electrical, gas and water supplies during hook up may still require the involvement of an experienced person.

In terms of maintenance, this outdoor unit comes with a maintenance notice setting that alerts you whenever it’s time to do some servicing. And like every Rheem model it has 1/2″ gas line compatibility.


  • One of the most powerful tankless water heaters available
  • High energy factor at 0.83 (or 83% efficiency)
  • Strong water flow rate at 8.6 GPM
  • No ventilation is required
  • Endless supply of hot water on demand
  • Less expensive compared to other models from Rheem
  • Easy installation and maintenance
  • Compact size
  • Comes with safety features to prevent overheating
  • Environmentally friendly with ultra-low NOX emission
  • Comes with UMC-117 remote control
  • Light (at 54 pounds) for an outdoor unit
  • Great price


  • May not last as long in harsher climates; pipes can get frozen
  • Minerals can accumulate within the system which may reduce the lifespan

Frequently Asked Questions

Q: What is the difference between the rtgh-95xln and the rtg-95xln?
A: The RTGH is the more efficient version (condensing water heater) it is 94% efficient and has a stainless steel heat exchanger. The RTG is slightly less efficient (82%) and has a copper heat exchanger.
Q: Could i install this unit in the crawl space?
A: No, the unit needs to breathe. This unit is meant to be installed outside.
Q: What warranty is available for this unit?
A: Warranty for Parts – 5 Years; Labour charges of repair for 1 Year; Heat Exchange warranty for 12 Years
Q: How many BTUs does this require?
A: 180,000btus.
Q: Can I install this in an attic?
A: No. This unit needs to be outside. If you want it in the attic, you have to get the interior model.
Q: Does the unit have a conversion kit for propane gas
A: No
Q: How efficient is this unit?
A: All models are high efficiency where the energy factor is 0.82 and higher and on demand water flow rate between 5.3 to high 9.5 GPM
Q: Will this still put out hot water during a power outage?
A: In the event of a power outage, the Rinnai Tankless Water Heater will not operate. However, it can operate with a battery backup system, which is available as third party accessories
Q: Does this unit come with everything I need to install it?
A: All of the basic fittings are included. You will need to have extra copper piping, solder and a torch on hand of course. Also you will have to order the safety valves.
Q: Does this item come with the shut off valves?
A: No, it does not. You will have to order valves separately.
Q: What is highest temperature this unit can go?
A: It goes up as far as 120F

Bottom Line

The Rheem RTGH-95XLN is a great product- one that is extremely efficient and will give you the best value for your money. It will deliver enough hot water to meet all your household needs and help you save money in the process. This unit can be used with up to 3 bathrooms and large appliances without noticeable fluctuation in water flow. You will always be covered even if two people are using the showers at the same time and you have to make supper hurriedly. The only downside you may notice with the Rheem RTGH-95XLN is its high price (which is expected considering its size and power) and the fact that it produces more noise. However, since it’s meant to be installed outside (though could can pose a problem), this shouldn’t be much of a concern. Overall, this unit is a good catch and will make a great purchase. You will surely benefit from having it around.

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