8 Best Indoor Natural Gas Space Heaters [Reviewed & Buyer’s Guide]

These heaters have recently gained popularity, mainly because of how effective they are in combating cold temperatures. However, buying a model that is easy to maintain and comes with multiple installation options is easier said than done.

Since there are quite a few factors to consider due to the many models available on the market, choosing the ideal product can be a bit time-consuming.

So, in order to make your job easier, we have handpicked the top 8 indoor natural gas space heaters after extensive research and testing. And to make things a notch more interesting, we have provided a buyer’s guide towards the end of this article.

Now, without further ado, let’s jump right in!

Listed below are the 5 best indoor natural gas space heaters from our list:

• Mr. Heater F299731. Mr. Heater F299731 provides even convection heat with no odor, an easy setup, and supports a maximum elevation of 4,500 feet.
• Mr. Heater F299821. Mr. Heater F299821 is a reliable heater for larger spaces like living rooms, equipped with automated temperature control for an optimal heating experience.
• Dyna-Glo BF20NMDG-4. Dyna-Glo BF20NMDG-4, featuring blue flame technology, delivers consistent heating without relying on electricity, while providing manual temperature control.
• World Marketing of America KWN521. World Marketing of America KWN521 excels in terms of heat output and coverage area, features manual control, and has an oxygen depletion sensor for enhanced safety.
• Rinnai EX38CTN. Rinnai EX38CTN, a premium-quality heater, highlights a smart control panel to prevent accidental operations, a programmable thermostat for temperature regulation, and is approved for high altitude use.

Each heater on our list has been selected based on its heating capacity, coverage area, thermostat control, safety features, and user satisfaction. So, if you're ready to transform your indoor spaces into cozy havens of warmth, here's the list of the 9 best indoor natural gas space heaters to keep you comfortable throughout the colder months.

1. Mr. Heater F299731 - Best for Safety and Performance

For over 60 years, Mr. Heater has dedicated himself to designing technologically advanced and heavy-duty heating products. And the F299731 Natural Gas Heater is a true testament to the brand's unmatched quality and innovative technology. Integrated with a slew of practical features that work to provide ultimate heating, this model is an option you cannot afford to ignore.

This model is CSA-certified, which means it has been tested to meet performance and safety standards.  Naturally, we really liked its blue flame burner, which ensures that the product delivers an even convection heat without any odor.

Thanks to its dedicated legs and mounting hardware, you can easily mount it on the floor or to the wall as per your requirements. So, the installation would be the last thing that users would have to worry about when purchasing it.

Apart from this, it supports a maximum elevation of 4,500 feet, something that people living in higher altitudes will truly love about this product. But you can easily get it replaced in case of manufacturing defects, thanks to its 1-year warranty.

Also, it features a reasonable price tag, making it one of the best natural gas heaters that homeowners can hope to get their hands on.

We did not come across any significant downsides to this product during our period of usage. However, we would not recommend putting it on the lowest setting, as it tends to produce a strong unburnt smell. Besides, the flame keeps jumping and making fluttering noises when the device is in the lowest setting.

2. Mr. Heater F299821 - Best for Large Spaces

As you already know, Mr. Heater is one of the most reliable brands for gas heaters, so it made sense to add another exceptional model from this popular brand. Tested by experts to meet the highest standards for safety and performance, the Mr. Heater F299821 Natural Gas Heater helps warm cold rooms in no time.

As a product from a brand that has been operating since 1957, we are happy to say it meets our expectations. One of the best parts about this gas heater is that it can heat spaces as large as 500 square feet, making it an ideal choice for heating living rooms.

On top of that, it comes with wall mounting hardware and legs so that you can easily install it without even breaking a sweat.

But especially pleasing is its built-in thermostat, which does a great job of controlling the temperature automatically. While the blue flame heater warms the air directly, the infrared heater warms objects, both playing an efficient role in giving users an optimal heating experience.

Finally, like most other Mr. Heater gas heaters, it comes at a reasonable price as well.

Once again, we don’t have much to say against this product, except for its poor packaging material, which makes it susceptible to damage during transit. So, check the product and all its parts thoroughly when it arrives to ensure it is in proper condition. Other than that, it works perfectly.

3. Dyna-Glo BF20NMDG-4 - Best for Budget-friendly Option

Our next unit is another quality addition from Dyna-Glo, a brand specializing in the manufacture of a wide range of high-quality commercial and home products. On that note, allow us to introduce you to the BF20NMDG-4 Wall Heater from the brand. Sporting a bunch of useful features, it delivers satisfying heating results.

For us, the main highlight of this gas heater is its blue flame technology, which works just like your home’s central heating system by transforming heat to warm the air. What’s more, it does not run on electricity, due to which is a reliable and handy option for backup heating in case of emergencies.

Unlike the previous two options mentioned on the list, it features a manual control system, which allows you to choose the desired temperature with just the turn of a knob. You'll also find that it's packed with simple-to-follow instructions, making it easy to install, and you won’t be requiring professional help to set it up.

Moving on, it features an economical price tag and is an ideal choice for users who don’t want to invest much in a gas heater. Overall, it is one of the top-rated gas heaters available on the market.

It does a decent job for most parts, but we had a hard time keeping the pilot lit. Also, the base legs used in mounting the product on the floor are sold separately, which is a bit disappointing. However, we don’t think users would mind these two minor issues, considering its budget-friendly price.

4. World Marketing of America KWN521

Founded in 1982, World Marketing of America is known for delivering consistently first-class heating products at reasonable prices. And the KWN521 Gas Heater is no exception. Users from across the US have praised this product for its wide range of highly functional features. So let’s dig a little deeper.

To begin with, it comes with a heating output of 30,000 BTU, which can heat the coldest of rooms in a jiffy. Plus, it sports manual control features, allowing users to adjust the heat settings at their convenience. Coupled with this is an oxygen depletion sensor that shuts off the fuel supply when the oxygen level gets low.

Now, it can heat areas up to 1,000 square feet, which makes it a lucrative purchase for homeowners with a big living space. Thanks to the detailed instruction manual, you don’t need to hire an electrician or a handyman to set this product up for you. Sounds impressive, doesn’t it? Well, there is more.

It has a responsive tech-support team that can address any issues that you might face with this unit. And lastly, it comes at a reasonable price, which ensures it delivers excellent value for money.

Without a doubt, this product performs exceptionally well, mainly because of its broad coverage and increased heating output. However, it does not come with floor stand legs, which could be a major downside for those who want to mount it on the floor.

5. Rinnai EX38CTN

The Rinnai EX38CTN is another good choice if you are looking for a premium-quality gas heater. Featuring an output range of between 13,200 and 38,400 BTU per hour, this model has the potential to heat up your whole home. Now, obviously, there is more to this unit, so keep reading.

Premium and easy to install, this space heater is the perfect choice for those looking to invest in a product that will last them for several years. This means, that even though you have to shell out some heavy dough, you can rest assured that you have purchased a highly efficient product.

It sports a smart control panel feature that prevents accidental operations, keeping it safe from the hands of children. Another advantageous feature is the programmable thermostat which easily detects temperature change and regulates it in order to provide a warm and comfortable experience.

Beyond that, we also liked that it is high altitude-approved, which is not short of good news for people living at higher altitudes. And lastly, it is backed by a 10-year residential warranty; now, this is something we don’t get with most other gas heaters on the market. Overall, it’s a product worth investing in.

This model is one of the most expensive gas heaters that we have come across, and hence it may not be within the buying capacity of most homeowners. However, it is worth investing in, given the various features you get. Other than the hefty price tag, we couldn’t find any fault with this unit.

6. Ashley Hearth DVAG11N

As we are nearing the end of the list, here’s another product from Ashley Hearth that you should consider. With the integration of a sealed burn system, the DVAG11N is an ideal choice for those who want to install a natural gas heater in their living spaces and bedrooms.

We were quite impressed with what this product had to offer. Straight off the bat, this gas heater comes with a sealed burn system, ensuring a safe and quiet operation. This makes it appropriate for use in bedrooms and living rooms.

Now, it sports piezo lighting technology for quick starts, which is a bonus, and has a heat output of 11,000 BTU, sufficient for heating areas up to 375 square feet. Also, since it works on natural gas, it can be used even during power cuts and other emergency situations.

Other than that, the manufacturer did not skimp on the warranty. In fact, the product is backed by a 1-year warranty, a must-have feature when it comes to expensive products like gas heaters.

The installation process might not be the easiest, as the instruction manual that comes with the product is not detailed enough. So, either you need to know the basics of installing a gas heater, or you have to get professional help for installing it. We tried doing it ourselves, but it was a tedious process.

What is the Best Indoor Natural Gas Space Heater?

Outlined below is an analytical comparison table intending to spotlight the key parameters of the most recommended indoor natural gas space heaters. The table assesses each option based on heating capacity, coverage area, thermostat control, safety features, venting type, and ignition type.

Buying Guide For The Best Indoor Natural Gas Space Heater

Let’s face it, going through the specifications and a few pros and cons are simply not enough when you are buying the best indoor natural gas space heater. There are a few other important factors that you need to consider in order to buy the right product based on your needs.

So, to help you, we have written this buyer’s guide, explaining some of these important factors in detail. We recommend reading this part very carefully.

1. Warranty

Warranty is one of the most important factors that need to be considered when buying a gas heater. Since it requires quite a bit of investment, you should always go with a model backed by a warranty. A warranty ensures that you don’t incur extra expenses for replacing or repairing the product within a stipulated time frame.

2. Oxygen Depletion Sensor

In our opinion, the oxygen depletion sensor is a must-have feature on a quality gas heater. This is because heat generally tends to affect the levels of oxygen, especially in confined areas, which could prove to be deadly for homeowners.

Now, what this sensor does is that it keeps a check on the oxygen level in the air and shuts down the device if it drops beyond a certain level.

3. Room Size

When buying a natural gas space heater, make sure that you check the room capacity mentioned by the manufacturer. In general, small rooms span up to 300 square feet, while average-sized rooms are anywhere around 500 square feet. Large rooms are anything above 1000 square feet.

As such, it is imperative to measure the size of your room in order to find out where it falls and choose the model accordingly.

4. Heat Output

The heat output is measured in British Thermal Units. It basically means how much heat the gas heater can produce. Needless to say, the higher the value, the better. A product with a higher heat output value raises the temperature faster. Hence, you must look for an option with a higher BTU rating.

With that, we have come to the end of our review-based guide. Hopefully, all doubts regarding indoor natural gas space heaters have been cleared, and you can make an informed purchase based on your requirements. However, before we bring down the curtains, we will let you in on our favorites from the list.

The Mr. Heater F299731 is the best model overall, in our opinion, mainly because it is very easy to install and features a reasonable price tag. On the other hand, the Mr. Heater F299821 could be an ideal buy if you are looking for an option that provides top-notch heating.

But, if you want a budget-friendly gas heater with manual controls, we strongly recommend going with the Dyna-Glo BF20NMDG-4. So, that’s all for now. Until next time, take care!