7+ Top Small Gas Water Heater Reviews 2020 & Some Basic Knowledge On Selecting The Best One!

Taking a proper bath is the main problem for everybody, even when you are out for camping or just traveling around. In such cases, the small gas water heater becomes a must for you to have for your outdoor life. No matter for washing your vegetables in your kitchen or taking a hot water bath, a small and compact water heating system will always assist you. However, we have already talked a lot about the residential tankless water heaters, which can be found through the reviews we have provided if you have any interest in buying one.

In this article, we have focused mainly on the small hot water heaters and particularly the small ones that you can easily utilize in the RV or other tents — waiting to get all the basic knowledge about these?

Let’s keep on reading!

Top Small Gas Water Heater Reviews:

Small RV Gas
Small RV Gas 2020
New Suburban Sw6De25 x 19 x 19 inches32.9 poundsCHECK ON AMAZON
Small Instant Hot Water
Gasland BS158 2020
Gasland BS15811.8 x 6.1 x 17.3 inches14.85 poundsCHECK ON AMAZON
Small Natural Gas
Small Gas
New RV Atwood 6 Gallon 2020
New RV Atwood 6 GallonCHECK ON AMAZON
Best Small Water Heater
Under Sink Small Electric
Best Bosch Tronic Electric 2.5-Gallon Mini-Tank Water Heater Reviews 2020
Bosch Electric Mini-Tank 10 x 10 x 16 inches29.5 poundsCHECK ON AMAZON
Small On-Demand
Atwood 94022 Combination Gas Electric 2020
Atwood 94022 Combination Gas/ElectricCHECK ON AMAZON
Hike Crew Portable Propane Water Heater
Hike Crew Portable Propane Water HeaterCHECK ON AMAZON

Best Small Gas Water Heater Reviews:

Check out the following reviews and then choose the one that suits your requirements better:

1. Small Natural Gas Water Heater; COSTWAY Gas Water Heater:


Desire a cheap but with the best performance one? It is the most appropriate one for the users. It takes just around two hundred dollars, and if you’re fortunate enough to get a discount, it takes just around one hundred dollars, and you get it home.

  • Portable Shape:

Dimensions of this gas water heater are 10 x 13 x 11.5 inches, so compact and small that can be simply put into a storage bag that comes with the device. No matter you want to make use of it for camping, your recreational vehicle, or other outdoor use, it can always meet the requirements you have.

  • Safety Protection:

A poor quality gas water heating system has the possibility of the explosion or gets burnt easily, for the gas leakage or other causes. COSTWAY gas water heating unit automatically turns off itself once the water temp exceeds 167 degrees Fahrenheit for a period.

  • Brilliant Quality Level:

Both the inlet hose and the shower hose are in the stunning level of quality. The heated water flows out right away; you open the heat on; thus, no water is wasted during the heating process. Automatic ignition can really make this unit out-stand among the most famous manufacturers available in the market.


  • Adjustable shower head
  • Can heat the water fast
  • Pretty flexible in the colder climates
  • Adjustable water temperature and flow
  • Super simple to assemble
  • Unbeatable cost


  • Battery-powered
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2. Small Gas Water Heater System; New RV Atwood 6 Gallon:

New RV Atwood 6 Gallon 2020

This water heating system is a perfect unit for RV or outdoor camping usage; the high performance of it provides a constant supply of heated water for you in the wild.

  • Pro Type For RV Usage:

It’s particularly made for recreational vehicle usage, no door needed, and it can really fit flawlessly with your vehicle. And of course, don’t anticipate a super long shower with it, for its capability of offering you with the heated water in around fifteen minutes. Quite short but is adequate for the outdoor.

  • Pretty Simple To Assemble:

As a small RV gas water heating device, the installation procedure is quite straightforward; you just require following the clear directions and self-installing it all by yourself. If you still have trouble, find a YouTube video, and it can help you in doing so.

  • Propane As The Main Power:

No matter for gas or propane water heater, it’s using charges, and energy consumption can be less than the electric types always.


  • Domestic quality
  • Two years of warranty
  • Six gallons capacity
  • Perfect for the outdoor usage
  • A steady supply of hot water


  • No door comprised
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3. Small RV Gas Water Heater; New Suburban Sw6De:

New Suburban Sw6De

New Suburban gas water heating machine, which comes with the electric ignition and the gas power as well, is appropriate for the recreational vehicle and camping use. The super-long service time and amazing working performance can really save you much energy and money.

  • Simple To Install:

The installation of this water heating machine is quite simple. All you have to do is follow the directions. But as it’s created for the RV usage, so the shape of it can really fit in perfectly. No leak and hassle appear during the process.

  • Six Gallons Of Water Capacity:

This gas water heater really features 12,000 British Thermal Units input, and the recovery rate is about 10.2 gallons per hour, which denotes that the heated water comes out right away, takes about ten seconds once the device is on. It’s not created for long time bathing but can flawlessly supply enough heated water for a short shower on your recreational vehicle.


  • Simple installation
  • DSI gas and electric
  • Simple hook up
  • Works perfectly
  • Reasonable cost


  • Don’t come with the door
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4. Small Instant Hot Water Heater; Gasland BS158:

Gasland BS158 2020

Diverse from the types recommended above, it is a tankless water heating device, which denotes instant hot water heater. No storage water or tank is required.

  • Compact Shape:

It can perfectly inherit the major benefit of the tankless water heating unit that’s very lightweight. For no storage tank required, the users would not face any trouble while carrying it around. You can simply hang this system on top of trees or other such supportive things using the mounting bracket; you can begin enjoying the heated water with just simple steps of installation.

  • Multiple Protection Systems:

Don’t get fooled by the cheap cost of it; it’s a functional gas water heating unit. It comes with the anti-freezing protection system; you can make use of it barely in any climate conditions. The auto-shutoff system of this water heating device can really shut off the machine smartly in case any flameout happens.

  • Instant Supply Of Hot Water:

The max power output can really reach 41,000 British Thermal Units per hour, which allows this device to supply instant hot water no matter where and when you require it. No pre-heat before utilizing as the ones with tank do. 1.5 gallons of on-demand hot water completely satisfy the users with a fast bath outdoor.


  • Advanced combustion technology for decreasing the consumption of gas
  • Can saves around 11.5 percent energy
  • Come with the showerhead
  • One-year warranty
  • Extensive range of applications
  • Adjustable pressure and temperature of the water


  • Poor instructions
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5. Best Small Water Heater; Atwood GC6AA-10E 6 Gallon RV Water Heater:


This water heating system has a compact shape, comes with six gallons of water capacity, and is also very lightweight; all make it a fantastic type for the recreational vehicle and small home-usage.

  • Functional:

Though in a compact design, it can really meet not just the basic requirement for supplying the heated water but also functional adequate for ensuring safe usage. High-temp limit switch, pressure relief, and advanced temp control, all are included for protecting safety.

  • The Anti-Corrosion Protection:

The big issue on the tank water heating system is the problem of corrosion; the Atwood water heating device makes use of the aluminum-clad tanks, eradicating the aluminum anode occurrence.

  • Simple To Install:

It’s created based on the common RV shape, but you can also fit it easily under your kitchen sink. Ninety-five percent of its parts can be easily replaced or fixed from the outside, which considerably adds up to the convenience and efficiency of repairing


  • Great working performance
  • Reasonable cost
  • Fits RV well
  • No leak


  • Not appropriate for the long shower time
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6. Under Sink Small Electric Water Heater; Bosch Electric Mini-Tank Water Heater:

Best Bosch Tronic Electric 2.5-Gallon Mini-Tank Water Heater Reviews 2020

What’s the top under the sink tank water heating machine? Well, it really belongs to the brand named Bosch. If you have ever heard about this company, then you might have knowledge of the magnificent performance of its devices and pleasing after-sale service.

  • Short Waiting Time:

Though recognized as the instant water heating machines, they still require a little time for the heated water to flow through the pipes. Thus the waiting can be really maddening. Bosch really shortens that time and saves a huge amount of your hard-earned cash on wasted cold water.

  • Seven Gallon Of Water Capacity:

The thermal efficiency of this water heater can really reach as much as ninety-eight percent, capable of supplying constant hot water for sink use. The water temp can range 65 to 145 degrees Fahrenheit, while operating pressure can keep the -150 PSI.

  • Quality Level For The Longer Life:

To max the energy efficiency, there’s the insulation of thick CFC-free foam. The glass-lined tank of this unit is adapted for the sturdiness. Not merely a device for under sink usage, it can really serve great for the buffer fitted in-line with tankless water heaters, too.

  • No Cold Water Sandwiching:

The worst showering experience is intermittent cold water. Fitting a Bosch mini-tank water heating system and you’re free from troubling hot and cold water transfer.


  • The compact shape really suits the small house usage
  • Extremely efficient
  • Reasonable cost
  • Simple to install
  • Ideal for both RV and residential usage


  • Electric powered
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7. Small On-Demand Hot Water Heater; Atwood 94022 Combination Gas/Electric Water Heater:

Atwood 94022 Combination Gas Electric 2020

Compared with the smallest water heating units available in the market, this Atwood 94002 one is the best one, costs the highest yet can operate the best.

  • Large Capacity:

Ten gallons of hot water capacity allows this water heating unit to supply enough hot water for a quick shower, needless to say, the everyday usage like clothes or washing dishes. And through the test, the speed of heating the water is quite fast.

  • Through-Tube Combustion Chamber:

By making use of the pilot frame, it can really keep the temperature of the water rather than losing the heat energy. With the combination of gas and electricity, it can really save much energy for you.

  • Simple To Install:

There’s a switch and a new door that comes along with the device, with the assistance of the clear directions, you’ll find it very simple to install this water heating unit.


  • Energy efficient
  • Works amazing
  • Work well with the recreational vehicles
  • Best cost for the overall performance


  • Poor after-sale service
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8. Small Propane Water Heater; Hike Crew Portable Propane Water Heater:

Hike Crew Portable Propane Water Heater

What are the common disadvantages of the recreational vehicle or small gas water heating system? The majority of which lack the LCD display screen, which denotes getting the temperature of the water and adjusting it can be a hard task. With Hike Crew portable heating unit, the users can really enjoy outdoor showering perfectly with the LCD display light.

  • Wide Range Of Application:

This water heating unit is made super lightweight and compact, ideal for RV, camping, or hiking usage. Connect AC/DC adapter to 12V cigarette lighter or the outlet, and then it’s time for enjoying the heated water outdoor.

  • Auto Shutoff System:

Safety is the major concern in using propane or gas water heating units, for it gets huge potential in reasoning fires with the incorrect operation. The auto-shutoff system can really turn the system off smartly once the temperature of the water reaches 125 degrees Fahrenheit; besides, there’re water flow sensor and tilt protection included as well.

  • Convenient Faucet Outlet:

Well, I have to say it is very astonishing design! Turn the device on, and you can have a water outlet, it supplest a steady stream of hot water for outdoor dishwashing or handwashing. You can even adjust the flow of the water easily.

  • Showerhead Included:

There’re three spray patterns on its showerhead. Plug it into your tap outlet on the back of the device, and then it changes into the simple handheld showerhead.


  • Water flow sensor
  • High-temp sensor
  • Digital control panel
  • Carrying bag and three adapters comprised
  • Heat/gas control


  • The temp indicator is shown in Fahrenheit instead of Celsius
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What Brand Of Gas Water Heating System Is The Most Reliable?

Here are three top-rated gas water heating units companies available in the market:

  • AO Smith:

AO Smith is the major company and rapidly expands the scales on the water heating machines market, so much that the other manufacturers feel hard to catch up with for an extended period.

aosmith small water heaters 2020

Beginning from a one-individual business established by Charles Jeremiah Smith, this brand has now owned more than sixteen thousand employees. The 1st business of it starts with hardware, like providing metal parts to bicycles and baby carriage. There won’t be many applauses and flowers, if not for the users and customers’ care of the Smith family. After entering the Chinese market, it slowly develops into the global water heating Technology Company manufacturing commercial and residential water heating devices and water purification and boilers equipment.

  • Rheem:

Rheem Company makes a huge share in the U.S. and other abroad, becoming respectful companies for the premium performance in tankless water heaters areas.

rheem tankless water heater brand 2020

  • Bradford White Corporation:

The Bradford White Corporation is structured of 3 major businesses, comprising heating systems, water heaters, and steel tanks.

Bradford White Corporation

Thanks to the thoughtful service, elite quality, and firm willingness on modernization, this corporation wins status for being the sound company on water heating. In the year 2016, Bradford was given an award of the Pennsylvania Company of the Year for the extensive efforts on boosting exports. Innovation is the unique source of industry development, and that is what this corporation keeps in mind and really takes action on it accordingly.

It also invests in different emerging technologies, expanding the complete markets with green technology so as to save our environment and producing its experts with continuous training. Walking into the factory, you’ll see complete loads of contemporary training facilities. And if you’re a deep ecological protector, then you’ll be happy to see a lot of advanced energy-efficient and green units lie peacefully there.

Things To Contemplate On Purchasing The Top Small Gas Water Heater:

The major concern is certainly the considerations and methods for selecting the top small gas water. And here is the solution for you:

  1. Tank Type:

Traditional Storage Tank:

Tank Type Water Heater 2020

Such a model once became the most well-liked ones in the history of the water heating device. Regarded as the modern water heater origin, it initially provided the heated water for showering usage. Consists of the insulated tank it can storage the limited amounts of hot water before required and then comes out from the pipe, serving for everyday residential hot water use. From the working process of it, it becomes pretty obvious why the large majority of individuals abandons the traditional storage-tank water heating units. Hassel life offers no additional time to wait for the hot water. However, there’s also a pressure relief and temperature valve fitted in case either of which exceeds its pre-set level.

Tankless Water Heater:

Tankless type

The tankless water heating devices are strongly multiple family members use or recommended for small space use. It needs no storage tank but making use of a heating coil for heating up the water right away you require. It can take just about fifteen seconds. On account of the no storage design of it, it can fit perfectly anyplace in the small house; you can place it either in the bathroom or try a small gas one fitted under the sink for taking a hot bath for bowls or plates. There’s no need to over-talk about the tankless models for all the info is comprised in the tankless heaters review.

Heat Pump Water Heater:

Heat pump water heater 2020

Well, as the name proposes, it looks precisely the same as the water pump. Unlike the formerly mentioned types, it can really capture the heat from the air and move it to the water, which can determine it to be utilized just in the warmer regions. As the heating device is on the top, it requires at least seven feet from the floor to the ceiling and also can demand a huge space (one thousand cubic feet) on capturing adequate heat from the air.

Solar Water Heater:

solar water heaters 2020

You might not strange to this type of water heating system; it can show anywhere in the hot areas around the globe. The main power it required is sunshine, through the roof-mounted cell; adequate sun heat is engrossed and transferred to the antifreeze-like solution in the closed-loop system. What if it gets drizzling for a couple of days, right, that is the major disadvantage of it. Though there’re the backup systems.

Condensing Water Heater:

Condensing water heater 2020

It can really serve as the addition to the natural gas water heating machine if the capacity you require really reaches more than fifty-five gallons. It also has a tank, not for storing the water like the traditional ones but for capturing the exhaust gases and emitting them out.

2. Usages:

The peak use of heated water determines the types you really require. Dishwashing times, bathing times, and clothes washing times ought to be calculated entirely and then measure out the max amount of water for the daily required. Still, have the issue on how you can really calculate the size of the tank? Look at this chart:

ShavingTwo Gallons
ShowerTen Gallons
Automatic DishwasherSix Gallons
Clothes WashingSeven Gallons
Food Preparation & Hand WashingFour Gallons

3. Energy Star:

Aside from the buying cost, using charges are also a huge amount of cash that you can never ignore, no matter for the gas or the electric type. Thus it’s never a bad subject on acquiring a gas water heating system reaching the Energy star rating. The hot water heating unit with the energy star rating denotes that the type you acquire saves around thirty percent for you, which is extremely energy efficient.

4. The Capacity:

In terms of the small gas water heating machine, for the majority of the time, it is utilized on the recreational vehicle or under the sink for offering the limited heated water for washing the dishes. Thus in place of the large capacity types like the fifty or fifty-five gallons, you ought to aim for the small ones.

5. Popularity Or Performance:

There’s always a saying that the more renowned the company is, the better the products of that company would be. Well, for a few areas, it’s a truth. But I would say that it actually depends. From the evaluation of the top water heating system companies available in the market today, you might find out that the working principle, as well as the using conditions of every type, differ very much. Thus instead of paying attention to the companies effects, the actual performance of the product is the first thing to put in first.

Why Should I Purchase The Small Gas Water Heating Machine?

When do you make use of the heated water in your everyday life? For washing your dishes in the cold weather? For shower? Or for the clothes washing? Yes, the heated water is required anywhere in the daily residential life. And that’s exactly why the hot water heating machines are always in great demand. There’re a few kinds of large capacity water heaters, able to offer the heated water for 3 or 4 showers at the same time. But what if you desire to go out for camping or traveling? The small gas water heating units are normally utilized outdoors, either on the recreational vehicle or for the camping usage. They’re small but work flawlessly for supplying the heated water for the travel demand.

Aside from the outdoor usage, a few of which can also greatly serve as the heated water source for washing your clothes or dishes under your water sink. For small houses, they are also a perfect option. But, between your gas water heating device and the electric water heating unit, why should one select the gas-powered one? Well, if comparing the prices of these two types of water heaters, you’ll find that the electric ones are far cheaper than the gas ones. However, from the statistics, using charges of electric ones can be much more costly.

How Much Does The Small Gas Water Heating Devices Cost?

Aside from the fitting charges, the gas water heating system cost ranges from four hundred dollars to one thousand dollars, while the electric water heating machine cost being three hundred dollars to seven hundred dollars. For small types using for the water sink or your recreational vehicle, it can be cheaper, usually around three hundred dollars; a few are even around one hundred dollars. Again, the buying price isn’t the only thing to consider, what makes you go deeper into the pocket are the using charges. So put all such elements into account before buying a water heater, and you’ll get what you really want and need.

Gas Water Heater Safety:

  • Always follow the directions given in the manual about installation and using.
  • You might as well fit an automatic gas turn off valve for stopping the gas flow.
  • Remove dust, paper, or other inflatable stuff from the device enclosure.
  • It requires regular maintenance or checks at least once a year.
  • Stop utilizing the unit when there’s something wrong.

When To Replace Your Water Heating Unit?

LeakSomething Inside Requires To Be Tightened
Metallic Taste or Brown WaterSign Of Rust
Drop In The Water Volume Through The FaucetBlocked Pipe
Sound DifferentStop Utilizing And Check
Using For Over Five YearsCheck & Maintain
Sudden Drop In The Heated WaterBad or Old Heat Elements


After going through different available options, we have come up with the following best three small gas water heaters:

Top 3 Best Small Gas water Heaters:

The best overall type

New RV Atwood 6 Gallon

New RV Atwood 6 Gallon 2020

The best cheap one

COSTWAY Gas Water Heater