Safest Ventless Gas Heater | Comparison of Top 5 Vent-Free Gas Heaters

Safest Ventless Gas Heater | Comparison of Top 5 Vent-Free Gas Heaters

Ventless gas heaters have a few things going for them; but most importantly, they’re arguably the most efficient types of heaters you can find anywhere. This is because they do not have a venting mechanism that releases exhaust out of the house; rather, everything is released inside.

Vented gas heaters are notorious for losing large amounts of their heat because heat is lost along with the smoke that is released outdoors. For ventless units, you’re likely to preserve and enjoy 100% of all heat produced as long as there’s no draft.

Coupled with their portability and the absence of serious installation, as well as their affordable prices, there’s a reason ventless gas heaters are becoming quite popular in households around the world.

Even with this obvious advantage, things can still go bad if you fail to get the right brand and product for your home.

We’re hoping that this post will be your trusted guide to help you make that choice by telling you all there is to know about choosing the right ventless gas heaters, as well as showing you the top 5 units on the market.

Top 5 Safest Ventless Gas Heaters

               #Gas HeaterSpecialty
1Mr. Heater Vent-Free 10,000 BTU Radiant Propane HeaterBest Overall
2Dyna-Glo BFSS20NGT-2N Vent Free Wall HeaterBest Range
3Sunnydaze 60,000 BTU Forced Air Propane HeaterBest Waterproof
4Kozy World Comfort Glow Gas Wall HeaterBest Weather Information
5Thermomate 18,000 BTU Portable Gas HeaterEasy to Install

Top 5 Safe Vent-Free Gas Heaters

1. Mr. Heater Vent-Free 10,000 BTU Radiant Propane Heater

Best Price

This Mr. Heater Vent-free propane heater comes with a 10,000 BTU capacity for heating, able to saturate small to medium rooms and spaces with sufficient heat.

This is enhanced by its ventless nature which gives it as much as 99% heating efficiency. It can be mounted on the floor or wall with included installation brackets, and also features a wire guard to prevent contact with the hot burner.

Perhaps, the most important features are the safety components and sensors which help to protect you from asphyxiation. The Oxygen Depletion Sensor automatically shuts off the system when it detects low oxygen and this is a CSA-certified feature.

The radiant heating technology is also an important way to keep Fumes low and the use of propane- a non-toxic gas- makes this unit all the safer.


  • The item weighs 17.65 pounds.
  • Proven dimensions at 19.75 x 11.25 x 22.5 inches.
  • Radiant heating method.
  • 250 sq. ft coverage.
  • Runs on liquid propane.


  • Quite portable.
  • Easy to assemble and install.
  • Safe to use.
  • Prevents burns.
  • Includes wall and leg-mounting hardware.


  • Does not include a carbon monoxide detector.

2. Dyna-Glo 20,000 BTU Natural Gas Vent Free Wall Heater

Best for Safety

If there ever was a ventless natural gas heater that pays attention to safety, it should be this one.

Between its adjustable thermostat that helps to control the temperature automatically and its built-in Oxygen Depletion Sensor (ODS), the unit is equipped to regulate heating and also shut off automatically when there’s a lack of oxygen or too much Carbon monoxide in the air.

This unit utilizes the forced air method of heating to push out warm air produced in the gas furnace. It is a ventless natural gas heater that produces visually appealing blue flame for heat and aesthetics.

The heater is able to produce as much as 10,000 to 20,000 BTU, depending on the setting it’s running on, and can cover spaces up to 700 sq ft.


  • 20.2 pounds in weight.
  • Dimensions at ‎20.94 x 10.08 x 24.02 inches.
  • 3 heat settings.
  • 700 sq. ft coverage.
  • 10,000 to 20,000 BTU.


  • Great visual appearance.
  • Easy wall-mounting procedure.
  • Blue flame provides a pleasing sight.
  • Good coverage.
  • Amazing safety features.


  • Quite pricey.
  • No floor mounting option.

3. Sunnydaze 60,000 BTU Forced Air Propane Heater

Value for Money

This is more of a commercial-grade ventless natural gas heater and is suitable for use in places like construction sites, factories, and so on. It has a forced-air heating mechanism with adjustable heat settings.

This Sunnydaze unit is a 60,000 BTU unit and can cover areas as large as 400 sq. ft. For safety, the unit features an automatic shut-off function that triggers the heater to go off when the temperature goes beyond 85° F or when the ignition fails or drops.

The 8-inch diameter cylinder gives the amount of opening required as the built-in fan blows out warm air into the room for the heating you desire.


  • 60,000 BTU heating Capacity.
  • Has dimensions totaling 8.25 x 17.25 x 14 inches
  • Powered by corded electric.
  • Uses propane gas for heating.
  • Weighs 12.6 pounds.
  • Forced air heating method.
  • 400 sq. ft coverage.


  • Great for patios and some outdoor settings.
  • Has an ergonomic carry handle.
  • Auto shut-off to prevent overheating.
  • Has a regulator for heat settings.
  • The propane tank needs to be bought separately.


  • Not the cheapest heater out there, but worth its cost.

4. Kozy World Comfort Glow Gas Wall Heater

Best for Convenience

This portable, but the powerful heater is simply mounted on the wall for convenient heating. It is a 30,000 BTU gas heater perfect for medium to large rooms and spaces, up to 1,250 sq feet.

As a ventless heater, this unit provides as much as 99% efficient heating in your room with little or nothing lost to venting. No electricity or ductwork is required, as it uses only gas.

The unit is also built for safety with an oxygen depletion sensor (ODS). But this also means it can’t be used at places with elevations up to 4,500 sq ft. The unit is easy to install and use with included wall brackets for easy placement.


  • Product dimensions at ‎10.25 x 28.15 x 24.41 inches
  • 29.4 pounds in weight
  • Covers spaces up to 1,250 sq ft.
  • 30,000 BTU


  • External grill to prevent burns.
  • Efficient heating
  • Very easy to use
  • Oxygen Depletion Sensor for safety
  • Built-in over-pressure shut off system
  • Also includes an optional floor stand.


  • Quite pricey

5. Thermomate 18,000 BTU Portable Propane Heater

Best for Mobility

This Thermomate propane heater is one of the most portable you’ll find on the market. However, it is also quite powerful with very efficient heating.

It is a cabinet-style unit that can provide up to 69 hours of operation running on its 20 lb propane tank in low mode. This unit has a coverage capacity of up to 450 sq ft with 3 heating levels of 6,000, 12,000, and 18,000 BTU respectively.

It is powered by gas and runs on the radiant heating method, offering up to 99% heating efficiency. It is also safe to use, easy to carry and can be used in a variety of applications and places.


  • Built for outdoor use
  • Weighs 14.6 lbs
  • Heating coverage up to 450 sq ft.
  • Radiant heating
  • Dimensions at 15 x 17 x 21 inches


  • Almost 3 days of continuous heating.
  • Easy to move around with 5 lockable casters.
  • Tip-over protection and oxygen depletion sensor for enhanced safety.
  • Quiet, odorless, and clean operation.
  • Easy to use.


  • Limited coverage capacity.

How To Choose the Best Ventless Gas Heater?

If you’re on the market for a ventless gas heater, it’s important that you buy a product you’ll truly enjoy. This means looking out for certain factors and features. We’ve provided a list of things you should consider before you make a choice.

1. Coverage

1. Coverage of Ventless Gas Heater

The ideal thing to do is purchase a ventless gas heater that can cover the area you wish to heat up. To do this, you must know the square footage of the room or space and compare it with that of the unit.

You can do this by multiplying the width by the height of the room. Be sure that you get a unit with coverage that’s slightly higher than that of your room. You may have to infer if you intend to use the unit for outdoor purposes, but it’s best to select a product with very large coverage.

If the area you intend to heat is about 700 to 1,000 sq ft, you should be looking at units like the Kozy World Gas Heater.

2. Heating Capacity

2. Heating Capacity of Ventless Gas Heater

Heating Capacity is one of the most important factors you must consider. This is measured in BTU and the higher the better. Some units offer as much as 60,000 BTU in heating, or even more.

A good example is the Sunnydaze forced air unit featured here.

This determines the amount of heat produced. However, you should only buy as much as you need, and watchout for the cost of operation as well, in terms of the cost of gas.

3. Installation

3. Easy to Install and Use Vent-Free Gas Heater

The kind of installation required is also a factor you need to consider. It is better and easier to go for a unit that requires little or no installation at all.

Even if it does, it should be easy and should come with installation kits. We advise you to go for units that can be placed on the floor or on a table.

There are also some units that can be easily installed on a wall. Just be sure you get a unit that is easy for you to install and use, and also move around when necessary.

4. Safety Features

4. Safest Vent-Free Gas Heater

Ventless gas heaters always seem to cause controversy when their safety is discussed. In fact, they’re not allowed in Canada and some states in the US, while some experts advise they should never be used indoors.

Therefore, you must ensure you purchase a unit that has safety features such as tip-over protection, oxygen depletion sensor (ODS), or an automatic over-pressure shut-off feature. The unit may have all of these features or maybe a few of them.

The units reviewed here all have a number of safety features to ensure your safety and that of your household.

5. Ease of Use

5. Easy to Use Vent Free Gas Heater

There’s no point in buying a ventless gas heater you can’t use. Ease of Use entails that the control buttons are well spelled-out and easy to manipulate.

It also means that you can maneuver the unit as you wish to give you the desired heating you desire. Furthermore, you should watch out for settings and an adjustable thermostat which would allow you to set the heating levels as required per time.

6. Price

6. Cheapest Vent Free Gas Heater

Price is certainly a factor for most of us. As great as a heater is, it is of no use to anyone who can’t afford it. So, you may want to consider the price of any unit you’re interested in to see if your budget is big enough.

The 10,000 BTU Mr. Heater gas unit is a great choice as far as price is concerned.

Comparison Of Top 5 Safest Ventless Gas Heaters

 Mr. HeaterDyna-GloSunnydazeKozy WorldThermomate
Coverage250 sq ft700 sq ft450 sq ft1,250 sq ft450 sq ft
Safety FeaturesYesYesYesYesYes
Maximum Heating Capacity10,000 BTU20,000 BTU60,000 BTU30,000 BTU18,000 BTU
Heating MethodRadiantForced AirForced AirRadiantRadiant

Final Words:

So, ventless natural gas heaters can be truly valuable and worth your investment, but they can be quite dangerous too. Therefore, you need to get the right product with some safety features to keep you and your home safe.

The products reviewed above will certainly be worth your while, but you may also choose from the numerous products online and pick what suits your needs and preferences. Whatever the case, you should be careful and ensure you follow safety procedures when you use one.

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