Top 10+ Best Tankless Water Heater 2018 Review & Buyer’s Guide

What if i tell you that you can save ​more money from your utility bills?

​Sounds crazy, isn't it?

​Well, you heard it right!

​You can really save more money from your monthly utility bills and more over you will get instant hot water!

You have to choose the best tankless water heater for yourself! 🙂

You may hear about the tankless water heater, which consumes less amount of energy and provides you a hot water in short periods of time. 

Choosing the best tankless water heater isn't an easy task because there are various tankless water heater available in the market!

​That's why our experts have spent more than 40 hours in research to find and review tankless water heater!

Make an informed decision and have the best tankless water heater that suits your needs and lifestyle.

Let's have a look at the short comparison table of the tankless water heater!

Shall we?

Best Tankless Water Heater-Buyer’s Guide

​Now th​en, ​You have already checked out the list of the best tankless water heater and if you still want to dig deep and want to know everything about the tankless water heater you want to buy then...

​Read on... the reviews of the Best tankless water heater!

best electric tankless water heaters


The next up on my list is Tempra 24 Plus.The best rated electric tankless water heater.

Over the 90 years, Stiebel Eltron is a leading brand in water heater production.

Furthermore, Tempra 24 Plus is made up in Germany, and this Tempra series entirely redesigned from inside as well as outside.

Do you know this electric water heater is more efficient than gas tank-less water heater?This unit is cheaper to buy and no need to install outside of the house.

Yeah, gas fuel is also less expensive.There is no combustion so that it is more reliable for a long term.

Tank-less electric water heater review: you can save energy and money. It doesn't require ventilation so no need to pay for setup.You can also use it with the solar panel.

Even more, it has a self-modulating power technology that saves 15 to 20% of your energy bill. It uses copper heating system and size of a briefcase so it can fit anywhere.

Many of you know the essential features of Tempra 24. What unique in this?

It has an advanced flow control design that provides desire water flow temperature even when demand exceeds capacity.

If flow rates vary then also Stiebel provides you a continuous hot water because every Tempra series equipped with the electronic controls.

Oh yes, you can get hot water even in high demand.Other manufacturer lacks in basically it is the electric on demand water heater.

Similarly, Talking about the technical specification Stiebel has a 4.68 GPM flow control.

Flow control may vary from an ease of hot water demand.

A maximum flow control of 2.6 gpm if you are using one shower and one sink.Similarly, 3.1 gpm for two showers,3.8 gpm for two showers and one sink, and five gpm for three showers.

It is almost 99% efficient that saves your energy and money too.Again, this water heater doesn't require venting whereas others are.

There are many series of Stiebel Eltron, Tempra 24 Plus is quite interesting, as it has a smart microprocessor technology and steady temperature even if, the flow rate may vary.

However, It's sleek design feets everywhere so. It saves space.Most importantly, Tempra plus series has a digital temperature control and certified by frustration-free.

Stiebel Eltron Tempra 24 plus has a warranty of 7 years against leakage and three years for parts. A weight of 15.4 pounds that sounds kinda cool.

If you want to save your space as well as money from your daily bill, then this is the best electric tankless water heater of 2018 to have.

Stiebel Eltron Tempra Plus 24 kW, tankless electric water heater  Review



  • Heats water very quickly
  • Installation of water heater is easy
  • No venting required, it saves space
  • It offers endless hot water
  • Maximum 30% of energy saving
  • Environment friendly.
  • Takes more time for the water to warm at the other end of the house

Great size for a small apartment. This is good if you want to enjoy long showers or have to compete with family members Checkout more reviews on Amazon

Checkout more reviews on amazon

SioGreen IR6000 - Best for town homes and mid size businesses

IR6000 by Sio Green, the best tankless water heater that I am going to review.

Sio Green is the coil free best tankless water heater for hard water because there are no limescale deposits or calcium.

It uses Quartz Infrared technology. So, it heats water without touching any metal. the water that you are using is heated.

Is it possible to use two sinks and three showers at a time?

Yes, It is possible because IR6000 has a HYBRID structure.

you just need to connect extra water heater with it and set the temperature. Best tankless water heater for two bathrooms and four people.

The flow rate varies according to the design of the water heater.For point of use flow rate range from 1.7 to 2.0 gpm with one shower.Similarly, for the whole house, ranges from 2.1 to 3.6 gpm with one shower and one sink.

Safety is the primary concern for anyone.right?

Sio Green offers high limit temperature and overheats thermal cutoff.Additionally circuit breaker and current detectors for your protection.

Although, it has a two model. High range for residential use and mid-range for commercial use.Both designs are corrosion free and maintenance free.

Only terrible is that inlet/outlet threads of water heater didn't match any standard USA adapter. Get the ride of standard USA thread; you must install cpvc plastic pipe and adapter.

Let me show you what features Sio Green IR6000 has.

It is 98 percent efficient and saves water and 60 percent energy from the daily utility bills.

27-pound of weight and maximum 3.6 gpm flow rate at 30 F temperature rise , 2 gpm at 60 F temperature rise.

It offers 60A double pole breaker. 

It is the environment-friendly best tankless water heater because it uses recyclable materials.

It has a great ten years of warranty on the heating element and three years on parts.

Someone who has an extensive apartment, town homes or small/medium sized business than buying IR6000 is the smart choice.



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    Environment-friendly design
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    It works great
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    Never run out of water, hot water on demand
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    Space saving design
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    Easy to install.
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    Not heat the water too hot.

It is best for large apartments, town homes, and family homes and small to mid-sized businesses Check out more reviews on Amazon.

Final Words:

If you are still confused and don't have any idea which one is the best electric tankless water heater you want then here is my pitch for you.

Stiebel Eltron Tempra 24 is the best for you.

In fact, if you have space problem then also this one is the smallest electric water heater that satisfies all your needs.

best  natural gas tankless water heaters


Before we begin, let me tell you that, Currently, Rinnai is the best water heater brand in the market.

Well, it's natural gas tankless water heater and has a good response in the marketplace since its launch.

However, someone found it bit expensive and tricky. is it?

Yeah, it is not easy to install, you should be careful. But once you installed it, you can enjoy the continuous hot water.

Another thing is that designed for residential as well as commercial use. The temperature settings of Residential vary from 98°F - 140°F and Commercial from 8°F - 160°F.

But wait... there is more point that I need to make sure that is you must purchase commercial controller separately.

which type of water heater is it?

'A versatile best tankless water heater.'

Many people confused in this.

For those who don't know that, it is an 'on-demand' tankless water heater, not an instant water heater.

Furthermore, Rinnai RL75iN delivers you maximum 7.5 gallons of hot water at 120-degree temp, and of course, you will never go out of hot water.

This best tankless gas water heater offers such a great features.Moreover, it has 10,300 BTU of min and 18,0000 BTU of max flow rate.

Sadly, it is large, so requires more space and the design is bit impressive. 

Standard silver model with MC-91-1 US Digital Controller and Error Code Indicator. The weight of 45 pounds that is not considered to be massive.

Rinnai Provides an 82 percent of efficiency which is same as a RHEEM RTG-64DVLN that we will see later.

Most noteworthy, 12 years of warranty on heat exchange, five-years on Parts, and 1 Year Labor for Residential Installations.

Instead of using another vent you can use exhaust or combustion vent.As combustion uses outside air that is good and safe.yes, it saves energy though it comes with the energy star certificate.

As I earlier said, it is the GAS water heater, but if you don't like gas you can convert it into the propane tankless water heater.

Thanks to its direct vent sealed combustion vent, you can place water heater at your bathrooms or rooms.

People who have hot water demand for two or three bathroom homes then yeah, this RL75iN is the best tankless water heater for you.



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    It serves continuous hot water to the multiple bathrooms
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    No need to install tank
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    It saves energy and space too
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    You can run the dishwasher, washing machine, and shower at a time
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    Because of its direct combustion vent, you can place water heater in room and bathrooms.
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    Not easy to Install
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    It is bit expensive.

Rinnai RL75iN is best water heater for medium sized home Check out more reviews on Amazon.

Takagi T-KJr2-IN-NG - best for small house with two bathrooms

In a list of a best tankless water heater 2018, this Takagi T-KJr2-IN-NG is famous for its small design. It is the Japanese manufacturing firm.

Let's go ahead with tankless water heater reviews.

In the series of Takagi, T-KJr2-IN-NG is one of my favorite smallest water heater released in 2010.

However;it is a natural gas tankless water heater, so it does not require electricity.Because of small size, it saves a lot of space.

Some people wondering it is small in size does it perform efficiently?

Yeah, Takagi T-KJr2-IN-NG is the dominant unit, and it acts as 40-gallon tank water heater can is 82 percent efficient with the flow rate of 6.6 gpm. 37 pounds of weight that sounds pretty good.

It can serve two bathrooms in a warmer climate.

Takagi allows you more substantial connection if you want higher flow rate and offers consistent water temperature through thermistors.

Wait.If you don't like a natural gas unit, you can convert it to propane.

T-KJr2-IN-NG is the indoor natural gas tankless water heater with the min gas input of 19,500 to max 140,000 BTU/hr.Venting requires 4-Inch category III stainless steel wire.

Let me clarify that this is the non-condensing type best tankless water heater.

You might don't know about this it turns off automatically when machine overheats.Its AFR(Air Fuel Ratio) sensors protect from harmful emissions by checking efficiency.

I have to say from other gas tankless water heater reviews this energy certified water heater perfect for light resident and radiant heating application.

Two different warranty for residential and commercial applications.

Ten-year Heat exchanger and five-year parts warranty for resident whereas five-year heat exchanger and 3 -year parts for commercial.

Warranty is valid if you install this unit from professional technician because it is the gas water heater installation must do correctly.But it costs more than the unit price that is what people don't like.

Apart from installation, I still recommend this unit for those who have a small house/apartment for its small design and great features.



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    You can use two showers at once when there is a warm climate
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    Reliable and higher flow rates in the winter/cold climates.
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    Great performance compared to price and saves space.
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    It is environment-friendly.
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    It costs a lot for installation.
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    It’s not appropriate for the largest households.

If you have a small house and everyone prefers shower and if you want to save energy, then this best tankless water heater be the best choice for you! Check out more reviews on Amazon!

Rheem RTGH 95DVLN - Indoor Tankless Water Heater

Raheem tankless water heater reviews:

Raheem products are considered to be the best in a market because it is tested and certified by third-party listed by AHRI and other governments.

In Raheem series, RTGH-95DVLN is the first one best tankless water heater that I am going to review.

There are many other Raheem model on my list that we will see later. Y

Some people found it bit expensive!

I agree, It does not come cheap but compared to its functionality and features it is worth to have.

Let me explain you. Rheem tankless water heater has an intelligent design control that increases efficiency and safety.

It is 94 percent efficient; this means it saves lot of money on your utility bills.

From the digital remote control and display screen to self-diagnosis system Raheem offers you what not?

That's not enough; there are still more features let's discover them.

A natural gas best indoor tankless water heater with min gas input of 11,000 to max 199,900 BTU.The flow rate may vary according to temperature.

It has a max temp 9.5 gals/min at 35-degree F rise and 8.4 gals /min at 45-degree F rise.

Raheem uses low NOx version, and it is the condensing type best tankless water heater that produces 9.5 gpm of hot water.Direct venting can be possible with the help of two-pipe direct vent system.

Here, Interesting about Raheem RTGH-95DVLN is that you can connect two tankless unit to the one.

In the case of higher demand, you should need EZ- link cable to connect.A 79 pounds of weight that considered to be massive.

Is it allow to run multiple appliances at a time?

Why not?

you can run two showers, the dishwasher, hand wash, laundry and trust me you never run out of hot water.

This biggest tankless hot water heater can manifold up to 20 units because of its optional MIC-185 and the MICS-180 manifold control assembly.

Phew!...12 Years of warranty on heat exchange, five years on the part and one year for labor service.

Raheem is Ideal for three bathrooms home with the Minimum flow rate of 26 GPM and max 40 GPM.



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    Provides endless hot water
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    It is easy to install and maintain
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    Excellent flow rate
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    Easy mounting of vent
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    Special Features are great.
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    It stops working after years
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It is more Preferable for really big family home with multiple 3-4 bathrooms. Check out more reviews on Amazon!

Rinnai RUC98iN - Ultra Series Natural Gas water heater

On my list, this is the second best product of Rinnai, The first one I reviewed was Rinnai RL75iN.

Rinnai RUC98IN is more efficient than its other series and has a more updated feature.It is only water tank manufacturer that offers multiple installations in one unit.

Before I start, let me tell you, RUC98IN Includes MC-91-2US controller, that previous Rinnai model lacks on my list.

Furthermore, Its sleek design allows installation anywhere and saves space.

Interesting part of Rinnai tankless water heater is that concentric or PVC twin pipe venting option available.

The concentric vent holds both intake and outtake pipes, so vent remains cool and comfortable to touch.

As Raheem water heater it is expensive gas tankless water heater among all another gas tankless heater, it uses 0.75-inch MNPT water and gas connection.

Extensive hot water flow rate ranges from 0.26 to 9.8 gpm and activation flow rate is only 0.4 gpm.

Certified by energy star certification.This Rinnai model works with natural gas as well as propane, and it will enable only indoor installation.

An 82 pounds weight thus it is not a lightweight water heater, so quite bulky.

As it is gas water heater it is risky to install by your self so, you must concern technician for installing this unit.

It is an on-demand water heater; there is the slight drop in water pressure using multiple showers. Sadly, it is not for smaller homes.

Above all, it has a gunmetal gray exterior and multiple venting options like concentric or PVC venting provided.

The Rinnai RUC98IN provides continuous hot water, of course, you can run two showers at a time.Even it can serve multiple bathrooms at a time.

A 98° F to 140° F residential and commercial temperature range. The commercial controller must be purchase.

As compared to its expensive design how much warranty it offers?

Rinnai RUC98IN offers the residential warranty of 12 years heat exchanger, five years parts and one year labor.While, Commercial warranty of 5-year heat exchanger, 5-year parts, and 1-year labor. 

I recommend this Rrinnai tankless water heater to anyone who have really big becomes your smart choice if you have this best tankless water heater for your really big house.



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    Good for natural gas saving
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    Almost soundless compared to others
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    Never run out of hot water
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    Space saving design
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    Excellent Self-Diagnostic System
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    Ultra low NOx emissions.
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    Not easy to install
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    need careful handling.

Homes with 4 or 5 bathrooms are best with this model. Check out more on Amazon

Takagi T-H3-DV-N - best for small house and beauty saloon

Another one from Takagi series, Takagi T-H3-DV-N condensing water heater.

Many of you know basic about Takagi products. So, what are the unique in it?

Takagi T-H3-DV-N offers computerized safety features.There is no pilot light to worry.

With Ultra Low NOx emission, it satisfies the 2012 SCAQMD Rule 1146.2. The energy star certified and NSF certified for commercial applications.

This is hilarious!

A 95 percent efficient with ten gpm of flow control.

Make sure you need at least 199,000 BTU/h to handle the power of Takagi. it only allows indoor installation.

The 63 pounds of weight that are higher than the previous Takagi series.

It is the 'powerhouse' unit how?Let me explain.

T-H3-DV-N can handle simultaneous sink or shower.The primary HRS-35 copper heat exchanger that is better than stainless steel whereas secondary uses 316L stainless steel.

It is the condensing type best tankless water heater that provides Internal freeze protection system, and direct vent power design makes it flexible.

Takagi series has a built it diagnosis system and temperature controller thus you no need to maintain anything.You can link up to four heaters without any extra accessories.

Venting can be done with PVC, CPVC OR ABC pipes.You can run four showers at a time in a warmer climate and three in a colder weather.

Although warranty is as follows, 15 years heat exchanger and five yrs part for Residential use and as well as five years heat exchanger and five years parts for commercial use.

Someone, who want to use it in small homes or else in a beauty salon, then this best tankless water heater to have.



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    Powerful unit
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    Excellent condensing system
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    Endless hot water on demand
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    Provides large capacity
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    Compact in size
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    Good Energy conservation
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    Installation can be complicated
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    The flow rate might falter in colder climates.

This water heater is best for those who has a beauty saloon and who want to use three to four shower at a time. Check out more reviews on Amazon

Rheem RTG-64DVLN - best for busy large home

Another one from Raheem is RTG-64 DVLN.

You might know that a natural gas water heater works better than the conventional heater.

Raheem RTG-64 DVLN belongs to the prestige series which mostly use for very busy and large homes.honestly, compare to other Raheem series this one gives you the mid-range efficiency of 82 percent.

There is not the more prominent difference between Raheem's natural gas tankless water heater.It allows only Indoor installation.

Additionally, with UMC-117 remote control you can manage settings inside of your room as well as outside also. With that 10-inch thermostat wire is included.

RTG-64DVLN is the direct vent natural gas indoor tankless water heater.

The flow rate of 6.4 gals/min at 35-Degree Rise.

A low NOx version offers you an endless hot water.

A 54-pound best tankless water heater has an energy star certification, and it is designed for indoor use only.

I am sure you like this.

Forget about the weather is, it fulfilling all your hot water demand and affordable too.

Energy efficient and eco-friendly design.Direct indoor vent available.Self diagnosis design ensures better servicing and easy installation.

You can connect two tankless heaters as one unit.Just need EZ- cable for combining them.

This water heater reviews is highly advanced, and it serves better user experience. Moreover, An electronic control improves readability.

Someone who have large home and have much busy family that they don't have time to handle anything then this is the best tankless water especially for you.



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    Serves you a instant hot water 
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    Very easy to install
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    Self diagnosis design.
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    you have to re-run the entire gas line in your house to work this unit.

This water heater is best for very busy and large homes. Check out more reviews on Amazon.

Final Words

So, are you confused about which best natural gas tankless water heater to buy?

Well, may I help you?

If you don't have any space problem and have a much larger family where every member loves showering and you need instant hot water for nearly 4 to 5 bathrooms, then Rinnai RUC98iN  is the one of the best tankless water  just only for you.

best Propane Gas Tankless Water Heaters

Takagi T-KJr2-IN-LP - best for MEDIUM size home

Takagi products have a good response in the market.

Okay, another Takagi product I am going to review is Takagi T-KJr2-IN-LP tankless water heater.

However, in the series of Takagi, this liquid tankless propane water heater is the smallest and quietest one.

Someone wondering that which type of water heater is it?

Propane tankless water heater from Takagi series is not for the 'whole house.It is the 'point of use' type water heater.Best for little houses and 1 to 2 bathrooms.

Yeah, if you want to use multiple baths then you need to install extra units

The main difference between T-KJr2-IN-NG and T-KJr2-IN-LP is that one uses natural gas while other uses liquid propane.

This 37 pound Takagi is the best tankless water heater i have ever seen with affordable price.

if you want a more updated version of Takagi series, then check out next product on my list that has more features then this unit.

An indoor liquid propane tankless water heater has a Minimum gas burning capacity is 19,500 BTU and maximum 140,000 BTU.same as previous Takagi series it is 82 percent efficient.A Max flow rate of 6.6 GPM.

This propane model has a convertible vent system, Direct venting with 4-inch category III stainless steel is required.Similarly, At the bottom side, 3/4 inch of water connection required.

T-KJr2-IN-LP comes with the energy star certification.Additionally, the heat exchanger made up of copper and has a 120V of AC voltage.

Its inlet and outlet thermistors monitor constant temperature to provide continuous hot water.Uses copper for heat exchanger and stainless steel to handle fumes.

For residential use ten-year on the heat exchanger and five-year on parts, similarly, for commercial use, five years on heat exchanger and three years on parts warranty are given.

if you have such a small homes, then this best tankless water heater 2018 is only for you.



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    Environmentally friendly
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    Affordable price
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    Smart working
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    Small and compact unit.
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    Not suitable for larger homes.

Best suitable for those who don’t want noise and for medium size homes who wants to work with multiple appliances. Check out it on Amazon

Rheem RTGH-95DVLP - best for residential use

Best water heater brand: Everyone precisely knows about Raheem, and its products, and if you still don't know about Raheem, you should feel ashamed.

Want to know more?

On my list, RTGH-95DVLP is the second one tankless water heater from Raheem.

To be honest with you, all the features of RTGH-95DVLP and RTGH-95DVLN is same.

The only difference is that one uses propane while another uses natural gas.

Similarly, as the Raheem RTGH-95DVLP-95 DVLN it has a low NOx design so that you can place it anywhere either inside or outside of the house.generally it serves 2- 4 bathroom at a time.

What is the best about Raheem products?

You can use two Raheem tankless water heater together for serving large home areas.Link several units with some special cable and its done.

RTGH-95 DVLP is 94 percent efficient, Electronic controls designed to increase efficiency and safety.The heat exchanger uses stainless steel for condensing. 

Certified by third-party efficiency listed by AHRI.

Uses low NOx version so, you can never run out of hot water.It uses two pipe direct vent system designed for PVC pipe.

You might don't know this.flow rate decreases around 1.1 gals/min when temperature  rise from 35 degrees to 45 degrees F.

The min gas burning capacity 11,000 to max 199,900 BTU/hr. The flow rate varies according to the temperature rise.At 35 degrees F, it is 9.5 gals/min and 45 degrees F; it is 8.4 gals/min.

Great warranty it offers,12-year heat exchanger, five-year parts, and one year labor.

Best for residential use.For those who loves a long shower and want huge amount of hot water then this is the best tankless water heater to have.



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    Low NOx design allows you to place water heater anywhere
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    Energy efficient 
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    It provides you a endless hot water.
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    You can combine two units for high hot water demand. 
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    Working-age is max 2 to 3 years
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    Much noisier.

Best recommended for residential use and for those who require huge amount of hot water. Check out more reviews on Amazon.

Rheem RTG-64XLP - outdoor installation and small home 

Imagine, if you have a best tankless water heater that saves water as well as provides you all facility that another high rated propane heater offers.

Here, the last one from Raheem series is Raheem RTG-64 XLP. The Best Tank-less Water Heater 2018 review.

this is works on propane, so you need to be careful while installing it.

Most noteworthy about Raheem RTG-64 XLP is that it only works when flow rate reaches 0.26 gpm but this is not the problem.

It slow downs the flow rate until cold water passes through pipe gets hot. Provides you an 81 percent of efficiency.

However, the flow rate is same as RTG 64 DVLN. So, what is the difference?

The only difference between them is that XLP need to be outside of the house and DVLN requires indoor installation.

Beware! If you mounted it inside of the house, then it causes a health problem.Again, must installed outside of the home so, that fumes can pass into the fresh air.

For knowing more, have a look at pros and cons below so you can get more idea whether it matches your requirement or not?

Interested to know more?

Let me tell you that Raheem RTG-64XLP is an outdoor tankless water heater and its flow rate varies according to temperature rise.

What's terrible?

A flow rate decreases while an increase in temperature.but that does not affect much.At 35 degree F rise flow rate is 6.4 gals/min, and At 45 degree F rise it is 5. 3 gal./min.

Even more, The UMC-117 digital remote control makes your water heater handling accessible for various operations.

Additionally, 10-Feet of thermostat wire included that continuously takes care of water temperature and offers on-demand hot water.

This 54-pound best tankless water heater uses low NOx version and certified by energy star certification.

Wait, there is more it manifolds up to 6 unit with an optional MIC-6 control board.

One of the best tankless product that energy efficient, space saving and offers continuous hot water.

Best for small homes and outdoor installation if you want a huge amount of water than you can combine two unit as a one with the help of EZ-cable.

Check Pros and cons gave below so; you can get an idea whether it matches your requirement or not.



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    Energy and space saving design
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    Very Affordable
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     Effective low NOx design
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    It manifold up to 20 units
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    Easy installation process.
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    Issue of cold water
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    Must be install outside of the house. 

This is best water heater for those who want outdoor installation of heater and smaller home. Check out more reviews on Amazon.

final words:


After seeing much of the best propane heater, you may confuse or have to make a choice.

Here is the little help for you.

Takagi T-KJr2-IN-LP one of the best propane heater I have seen with such a great price and features.This water heater is noise free and outdoor type so no need to worry about and risk.

If you are are looking for something like multi-working then this Takagi propane tankless heater is the smart choice.

What to look for in best tankless water heaters?

Well, it requires a bit large amount of investment at upfront but it save money in the long run.

So below are some considerations you take care of while deciding on the best tankless water heaters.

Energy sources

The tankless unit was available in two type’s gas and electric. Gas water heaters may require natural, propane or both gas combinations.

Electric: This is most efficient and easy to install water heater since it requires venting.

Check that it requires electric load specification so before purchasing any electric unit check your home capability in comparison with your unit load capability.

Gas: This unit save electricity and require gas line either natural gas or propane to fuel the tankless water heater.

A gas water heater is a bit less energy efficient compared to electric one.

Energy Efficiency

One of the reasons why people choose tankless unit is how much they save on gas or electric unit.

Energy efficiency is the one that measures how electricity converts in heat and how much heat is lost during storage.

Electric water heaters have a higher efficiency then tankless unit.
The higher the EF (Energy Factor), the more energy efficient the unit is.


Mostly warranty are provides for heating elements, labor, and for other parts. They range from 1 year, two years to lifetime period.


Electric water heaters don't need any venting.

Which kind of venting do you need? Indoor or outdoor

Gas water heaters require venting. If you are looking for the gas tankless water heater, then check out the venting option.

If you are looking for the indoor unit, then choose the one that offers you indoor installation. For gas units, outdoor installation is preferable and safe then indoor one.


Certification shows you energy efficiency, convenient design, and safety.

There are many certifications in tankless water heaters that listed below.

UL: This one is for public safety and independent organization that tests the product for public safety.

AHRI (Air-Conditioning, Heating, and Refrigeration Institute): This certification is for air conditioning, heating, refrigeration institutes.

SCAQMD: Certified for lower NOx output.

final words:

Still are you Confused about which one is the best for your needs? so, here is a little help for you.

If you have a shortage of space, and also you love the long shower, then Stiebel Eltron Tempra Plus is the best tankless water heater you may have and I recommend it to you, as it is best in budget and gives more features. 

Another one that I recommend for a big family and someone who want to use 4 to 5 bathrooms at a time then Rinnai RUC98iN is the smart choice.

Checkout more best tankless water heater on Amazon

5 (100%) 4 votes

One Response

  1. Avery Yarnall May 17, 2018

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