5 Best Small Greenhouse Heaters

Finding the best small greenhouse heaters can be difficult, but this blog post will help you find the best one for your needs. Greenhouse heaters provide warmth and humidity so you’ll get bigger harvests and healthier flowers. First, we’ll talk about the benefits of a greenhouse. Next, we’ll discuss some of the features to look for when purchasing a greenhouse heater. Finally, we’ll introduce some different models that are available on the market today and give some pros and cons of each one so you can make an informed decision before buying!

Benefits of a Greenhouse

A greenhouse is a great addition to any home. Not only are they aesthetically pleasing, but they can also provide you with many benefits.

Greenhouses have been used for centuries by farmers and growers because of their ability to create the perfect environment for plants in order to produce more food than usual. Plants grow faster because they are not exposed to harsh outdoor elements like wind or rain. The temperature inside a greenhouse is regulated. By creating this same environment in your backyard or on your patio, you too can enjoy all of the benefits that come along with it! 

best small greenhouse heaters

If you want to grow vegetables year-round without having to use pesticides or herbicides, then investing in a greenhouse would be an excellent decision on your part. Growing food indoors will eliminate any chance of contamination from these chemicals getting onto what you are growing. It also provides protection from animals such as birds and squirrels.

The best small greenhouse heaters will help you to grow healthy plants and maximize these benefits of owning a greenhouse.

Types of Greenhouses

The best small greenhouse heaters will depend on the type of greenhouses they’ll need to keep warm:

  • Cold Frame: A cold frame is great because it doesn’t take up much space but it needs more constant heating than other types of greenhouses. This means that most people who use this type of greenhouse turn their heater on around sunrise and leave it running all day long .
  • Hoop Houses: This type of greenhouse is best for people who live in a warmer climate. They don’t need as much heat to keep warm and can often use a propane heater that only needs to be turned on once or twice per day.
  • Lean To Greenhouses: These greenhouses are similar to hoop houses because they also work best with easy-to-use, low temperature propane heaters. However, lean to greenhouses typically have more plants so the best small greenhouse heaters will likely include an adjustable thermostat so you can control how hot it gets inside your greenhouse even if you’ve got lots of plants!

Tips for Heating Each Type of Greenhouse

small greenhouse heaters

Before we delve into the best small greenhouse heaters, you might be wondering about how to heat each type of greenhouse.

  • Cold Frames are best heated when temperatures drop below 35 degrees Fahrenheit since that’s when plants need warmth most. You’ll want to turn on your propane or electric heater around sunrise and then maintain a temperature of between 40 and 50 degrees Fahrenheit throughout the day . If necessary, keep adding more insulation depending on how cold it gets!
  • Hoop Houses should only have their heaters turned on once per day . As soon as soil begins to freeze at nightfall , make sure to turn off your small greenhouse heaters!
  • Lean To Greenhouses are best heated on days when the temperature is below 65 degrees Fahrenheit. These structures should only have their small greenhouse heaters turned on once or twice per day to maintain a steady temperature of between 70 and 80 degrees Fahrenheit.

What to Look For In a Greenhouse Heater?

The best small greenhouse heaters are an asset for a greenhouse that is small to medium sized. Greenhouse heaters provide warmth and humidity so you’ll get bigger harvests and healthier flowers!

There are some features that you should look for when choosing the best heater for a small greenhouse.

best heater for small greenhouse


One feature to look out for is size, which can be crucial if you have limited space or want to add lots of other accessories (such as water tanks) near your heater. You need to check how much space you have for a greenhouse heater, and how big your greenhouse is.


BTU stands for British thermal units, and it refers to the amount of heat emitted. 

However, not all heaters use BTU in their specs. 

The higher the wattage of the heater, the more powerful, but that also means a higher electricity bill.

Adjustable Thermostat

Another feature to look for in a greenhouse heater is an adjustable thermostat. This way you can control the temperature inside your greenhouse,

Power source

There are three choices: electric, natural gas and propane. 


This is perfect for people who enjoy gardening in their own backyard, but would want to do it inside a greenhouse. In a nutshell, it’s excellent for tiny greenhouses.

You may have the powerline in your house and just need an extension cord to reach the greenhouse. It is extremely efficient at regulating temperature.

There are no harmful fumes to worry about, either. In addition, electric equipment creates less greenhouse gas emissions.

Natural gas

Please note that this is only possible if there is a gas line that connects directly to the greenhouse.


This is the most popular power source for greenhouse heaters. It is affordable and convenient.

Good ventilation is needed to use a propane greenhouse heater.

Best Small Greenhouse Heaters

Here are our top picks for the best small greenhouse heaters.

Best Budget Small Greenhouse Heater: Dr. Heater DR218-3000W Greenhouse Garage Workshop Infrared Heater, 3000-watt

Dr. Heater DR218 -1500W/3000W Greenhouse Garage Workshop Infrared Heater

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  • Lightweight, portable, ergonomic design.
  • IPX4 waterproof construction.
  • Easy to use thermostat.
  • Usable both indoors and outdoors.
  • Energy efficient
  • Low noise fan


  • Relatively smaller when compared to other heaters on this list.

Featuring only one setting, and capable of warming up 150 square feet in a few minutes, this 3000W heater is one of the best small greenhouse heaters. This heater comes with all the essential features you need to grow plants under any weather condition:

  • Automatic shutdown when it gets too hot
  • Lightweight design
  • Requires very little maintenance
  • User-friendly (with one setting, this mini greenhouse heater is a breeze to use).

Compared to other more expensive greenhouse heaters in the Dr. Heater range such as the Dr. Infrared Heater Portable Space Heater and Dr. Heater DR-910F Shop Garage Heater, The Dr. Heater DR218-1500W Greenhouse Heater is an affordable device perfect for small greenhouses or urban indoor grows. Utilizing fan force heating technology, the device ensures ample circulation in your space, and the auto-shutdown feature guarantees that your plants will not suffer heat stress be it in the cooler or warmer months.

Splash-proof, lightweight all-metal case and very easy to use, this device features solid metal blades and a high-quality heating element built to last. We cannot say much about its aesthetics, but if you are looking for a small greenhouse heater and are on a budget, this is one of the best mini greenhouse heaters.

Featuring an in-built thermostat, a quality fan, and a heavy heating element. This mini heater only needs 1500 watts of power — meaning you may connect it to a solar power source or an outlet.

One minor issue we have with the device is the quality of the thermostat. So, we recommend investing in a thermostat along with this heater.

That said, Dr. Heater DR218 Greenhouse heater is reliable, safe for tender plants, and the features on offer are on par with other more expensive small greenhouse heaters.

Compared to heaters in its price range, Dr heater DR218 offers balanced performance, the heavy-duty build means that it is built to last, and the ergonomic portable design allows you to move it with ease. The device only measures 10x10x 15, meaning it does not require much room, and you may use the handle to suspend it, giving you more legroom. IPX4 approved waterproof system makes the device safe to use in a wet environment.

Instead of blowing hot air, Dr. Heater blows warm air. That is beneficial in that it poses very little or no threat to delicate plants such as herbs or flowers that are sensitive to heat.

Best Propane Small Greenhouse Heater: Mr. Heater F232000 MH9BX Buddy 4,000-9,000-BTU Indoor-Safe Portable Propane Radiant Heater, Red-Black

Mr. Heater F232000 MH9BX Buddy 4,000-9,000-BTU Indoor Safe Portable Propane Radiant Heater

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  • Low noise and small footprint.
  • Knock over protection
  • Affordable
  • Aesthetically pleasing
  • Highly portable due to the lightweight ergonomic design


  • Not suitable for elevations above 7000 feet.

This is the best non-electric small greenhouse heater. It is a lot quieter than the original Mr. Heater by the same brand, plus it features an ergonomic handle and plenty of useful features.

On high settings, the device will provide up to three hours of heating and on low expect double that amount of time. However, the device does not limit you to using the default gas tank, meaning it comes with a hose that you may use to connect to a larger gas tank. Featuring “knock over” protection that turns the flames off should the device tip over, this heater offers you safety, gentle radiant heat, and it comes at a pocket-friendly price. Designed to warm up 225 square feet, this heater is perfect for greenhouses, camping, rural settings, or spaces not connected to the grid.

One downside is that the manufacturer sells the gas tank separately from the device. However, this allows you to choose a tank suitable for your needs.

The added features include an emergency low oxygen safety system, a thermal shutdown system, and Apex 50 degrees Tip switch.

Dubbed “North America’s most popular propane heater” Mr. Heater F232000 is compatible with one-pound propane cylinders, its minimalistic design means that it has a small footprint and tip over protection system and low oxygen safety systems keep you and your family safe when in use.

One issue is that the manufacturer does not recommend using the product at an altitude above 7000 feet. Consequently, the heater is unavailable in the Canadian market and some parts of Massachusetts.

Not only built for greenhouses, you may also use the heater in your office, camper, garage, when fishing, camping, and so on.

This small greenhouse heater is Ideal for 225 square feet and area below 7000 feet (altitude).

An ergonomic heavy-duty design makes the device both highly portable and durable. It does not require electricity, making the device suitable for remote, urban, or indoor farming. The gentle radiant heat is easy on delicate plants, and it comes with a hose that you may use to connect to a larger gas tank.

Hours of warmth, safe to use, and unique safety features make Mr. heater one of the best small greenhouse heaters you can purchase today. A plus point is its affordable price tag.

Best Beginner Small Greenhouse Heater: Bio Green PAL 2.0/US Palma BioGreen Basic Electric Fan Heater for Greenhouses, 2 Year Warrenty

Bio Green electric Greenhouse heater Palma

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  • Durable construction
  • Multiple safety features, including auto-switch off.
  • Low noise
  • Suitable for cool and warm weather.
  • Plug and play
  • Fan forced heaters: make it great for small and large rooms.
  • Very little noise during operation
  • Energy efficient
  • Inexpensive to operate.
  • Lightweight
  • Works with solar energy


  • The thermostat is sold separately.

Made mainly of attractive stainless steel with rubber feet, the Bio Green Electric Green House Heater ranks as one of the best small greenhouse heaters available in the American, European, and Asian markets. Powerful, compact, easy to use, and energy-saving, this small greenhouse heater is perfect for both cool and warm months.

When buying electric heaters, experts in the industry recommend that you consider heating capacity, heater type, energy efficiency, and noise level.

What is special about the Palma heater is that you can use it as a stand-alone unit or with a thermostat. The thermostat features a 90 cm power cable, and the system is plug and play. Meaning easy setup.

During winter or the colder months, the thermostat gives you the freedom to control grow room temperature, allowing you to grow crops all year round. The powerful high-quality inbuilt fan and heating elements set the Palma greenhouse heater apart from the competition in that the heating element does not go out during operation.

A carry handle and multiple temperature settings allow you to alter output levels or switch between fan heated or fan-only modes. These features are useful in adding air circulation into your space.

The right-hand button on the thermostat allows you to easily switch from heating to cooling or vice versa. The thermostat also features led indicators that tell you whether the device is in heating or cooling mode.

Unlike traditional greenhouse heaters, the recommended use for Bio Green Basic Electric Fan Heater for green House includes workshops garages and greenhouses. If desired, you may hang the device or place it on the ground. Remember, the air intake is on the back of the device, so do not place it too close to the wall or greenhouse paper. We recommend 16 inches from the wall or paper and 20 inches from the plants. Screws on the side allow you to position the heater at an angle that you see fit.

Do you need the thermostat? The heater itself features a heat dial that allows you to customize your temperature. However, the thermostat gives you more control. You will need a thermometer to maintain the temperature. What you need to do is turn on the temperature dial-up or set the temperature using the thermostat. then keep your eye on the thermometer. Once the room temperature reaches the desired level, turn the dial back down until it clicks. Doing that will allow the heater to maintain the set temperature.

This heater is ideal for 120 square feet greenhouse or space. The thermostat goes down to minus 2 degrees Celsius.

Combined with a thermostat that the company sells separately, the Palma greenhouse heater offers you unrivaled air circulation at a rate of 163 meters per cubic hour and 1500W electrical output. That means it uses less energy, and the device is perfect for both heating and cooling your greenhouse, garage, or milking shed. Our only complaint is that the thermostat is sold separately.

Best Small Greenhouse Heater for Delicate Plants: RSI RSI-EC14K Greenhouse & Work Shop Heating System

RSI Green House heating system small greenhouse heater

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  • Inbuilt thermostat
  • Energy-efficient and low-noise design.
  • Suitable for small and medium-large rooms.
  • Heavy-duty construction.
  • Fan forced heater.
  • Low noise
  • Energy-efficient.


  • Relatively expensive

What it lacks in aesthetics, the 2000-5000W RSI Green House Heating System makes up for in functionality, power, settings, and control. Unlike the Biogreen electric heater that features a detached thermostat, the RSI Green House Heating system features an inbuilt thermostat that gives you more control over room temperature.

What makes the RSI greenhouse heating system stand out from the competition is the number of features the device offers. On offer, is a UL (global safety certification) listed device. That offers you useful features including, two heat settings, a built-in thermostat, automatic fan control, auto shut off (in case of overheating), copper brazed parts that lower energy utility, heavy-duty particle filter, touch-safe casing, tip over sensors, and 1500W power.

This greenhouse heater is designed for use in well-insulated rooms approximately 800 square meters. That makes it perfect for small, medium to large greenhouses and garages, shelters, or workshops.

The feature that impresses us the most is automatic fan control. Automatic fan control coupled with thermal cutout automatically turns off the heater in case of overheating. the heater requires very little monitoring because if the device turns off due to high temperatures, it will reactivate when the temperature drops back to normal. The point being, the key selling point for this device for most buyers is more freedom.

The RSI Greenhouse heater is a stand-alone item that does not require you to spend money on extras. Everything you need to get it up and running is in the box. Also, installation is easy, and as mentioned the heater requires very little monitoring.

Aesthetically, it does not look like much but feature-wise, this is one of the best small greenhouse heaters.

This heater is ideal for enclosed spaces measuring 800 square meters

The inbuilt adjustable thermostat gives you more control over room temperature. The heater offers plenty of practical features including, automatic on and off, and the heavy-duty construction means that the heater is highly durable.

Choose the RSI Green House heating system if you are looking for:

  • A small greenhouse heater perfect for small to large greenhouses, shelters, or garages (multi-use item).
  • Heavy-duty construction (built to last).
  • Auto startup and shut down.

One issue is that the heater is relatively expensive. However, one is enough to heat an 800 square meter greenhouse. So, if you are looking for a small greenhouse heater suited for small, medium to large greenhouses, look no further.

Best Waterproof Small Greenhouse Heater: iPower Electric Heater Fan for Greenhouse, Grow Tent, Workplace, Overheat Protection, Fast Heating, Spraywater proof IPX4, Black

RSI Green House heating system small greenhouse heater

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Lightweight and featuring a digital cooling thermostat, the 1500W Ipower electric Heater fan is a small greenhouse heater that offers you overheat protection, wide application options, is spray proof, and heats small spaces fast.


  • Inbuilt thermostat
  • Energy-efficient and low-noise design.
  • Suitable for small and medium-large rooms.
  • Heavy-duty construction.
  • Internal heat limiting control and overheat protection circuit
  • Low noise fan
  • Energy-efficient.
  • Forced air system
  • Built-in thermostat
  • Ergonomic Anti-tip over design.
  • Discharge safety grills


  • Relatively expensive

What makes this small greenhouse heater different from previous models is its internal heat limiting control. This added feature ensures that once the desired room temperature is attained, the heater shuts off. The low power consumption means that you may use it with solar or connect it to an outlet.

Lightweight, powerful, and features a carrying handle, this is a greenhouse heater that promises fast performance, easy use, and portability. The air output is 4500 cubic feet per hour, and the electric power supply is 120v 560hz from 25W to 1500W. Recommended for use in small spaces, the heater features an IPX4 rated waterproof system, meaning it is completely waterproof.  In heat mode, the fan runs continuously, ensuring optimal circulation in your greenhouse, garage, or other small space.

7 feet grounded power cord means that you do not necessarily need extension cables.

A bevy of useful features, an ergonomic lightweight design, low power consumption, and waterproof, make the Ipower electric green heater is perfect for small urban greenhouses, indoor growers, and small spaces in general. Aesthetically, the device looks sleek but simple, and the dials and settings are easy to navigate.

This small greenhouse heater is ideal for spaces measuring 160 square feet.

Its heat adjustment range is from -50 degrees to 99 degrees Celsius, making it perfect for both colder and warmer months.

The stainless-steel housing on the Ipower electric fan heater for greenhouses makes the device perfect for wet environments, the ergonomic lightweight design allows you to take it wherever you wish, and the fan that runs continuously -provides ample circulation in your greenhouse.

Safe for delicate plants and featuring multiple settings, the Ipower electric fan heater is the type of heater that you can use all year round.


Here are some reasons why a greenhouse heater is important. Greenhouses provide a way for people to grow crops year-round and can help with food shortages. One of the most significant benefits of a greenhouse heater is that it protects your plants from extreme temperature changes. By using an efficient greenhouse heater, you will be able to increase production output during colder months. If you’re thinking about building a new greenhouse, make sure it includes efficiency features like double pane windows and insulation. In addition, please ensure to use manufacturer recommended accessories for your greenhouse heater to lessen the possibility of malfunctions or accidents. We hope this information was helpful. Happy gardening!

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