Top 7 Best Greenhouse Heaters For Optimal Plant Growth

Best Greenhouse Heaters for Optimal Plant Growth
Best Greenhouse Heaters for Optimal Plant Growth

As a dedicated gardener, you understand the significance of providing a stable and warm environment for your plants to flourish, particularly in colder months. The best way to achieve this ideal temperature and humidity level is by utilizing a greenhouse heater.

This article has compiled a list of the top 7 best greenhouse heaters that are reliable, energy-efficient, and durable, ensuring your plants are always happy and healthy.

The Best Greenhouse Heaters

Big Buddy Heater (Propane)

Bio Green Palma Heater (Electric)


Mr. Heater Forced Air Heater (Propane)


Dr. Heater Greenhouse Heater (Electric)


Gasland Heater (Propane)


Dura Heat Convection Heater (Propane)


Buyplus Fan Heater (Electric)


1. Big Buddy Portable Propane Heater

Technical Specifications

  • Power Source: Propane
  • Heat Output: 18,000 BTU
  • Heating Coverage: 450 sq. ft (42 sq. m)
  • Height: 17 In (43 cm)
  • Width: 10 In (25 cm)
  • Length: 17 In (43 cm)
  • Weight: 16 lb (7.3 kg)

The Big Buddy Portable Propane Heater is a reliable and efficient choice for greenhouse owners looking to keep their plants warm during colder months.

With a heating capability of 4,000 to 18,000 BTU, it can efficiently heat up to 450 square feet (42 square meters) of greenhouse space. Its high, medium, and low heat settings allow customizable temperature control to suit any plant.

The heater’s life safety system has an automatic low oxygen shut-off system and accidental tip-over safety shut-off, ensuring safe usage and providing peace of mind.

The heater can be easily set up with one or two 1-lb propane cylinders or connected to a bigger propane tank using Buddy accessories. Its

Overall, the Big Buddy Portable Propane Heater is a worthy investment for greenhouse owners due to its safety features, heating capacity, and ease of use. It is a reliable option for keeping your plants thriving during colder weather.


  • Provides efficient heat quickly.
  • It has an automatic low oxygen shut-off system and accidental tip-over safety shut-off.
  • It can be used indoors and outdoors.
  • It can be connected to larger tanks or a remote gas supply.
  • Offers a clean look to the heater.


  • It does not have a fan.
  • It does not have a thermostat.

2. Bio Green Palma Greenhouse Heater

Technical Specifications

  • Power Source: Electric (Fan and Forced Air)
  • Heat Output: 5,118 BTU
  • Heating Coverage: 120 sq. ft (11.1 sq. m)
  • Height: 12.5 In (32 cm)
  • Width: 8.0 In (30 cm)
  • Length: 11.0 In (28 cm)
  • Weight: 10.8 lb (4.9 kg)

The Bio Green Palma Greenhouse Heater is a robust, energy-efficient solution for heating small spaces, such as greenhouses, sheds, garages, or store rooms.

Its stainless steel housing and floor-standing design make it durable and stylish, while the digital thermostat and external sensor cable ensure accurate temperature control. The heater’s compact size and slip-resistant rubber feet make it easy to move around and position where needed.

The technology behind the Bio Green Palma heater maintains a consistent temperature throughout the greenhouse, avoiding energy-wasting temperature peaks and ensuring reliable frost protection.

The heater’s fan settings can effectively circulate hot air during cold months and cold air during the summer.

Overall, Bio Green Palma Greenhouse Heater is an excellent choice for those looking for an efficient and reliable electric heating solution for their small greenhouse.


  • Effective at keeping a small greenhouse warm during cold temperatures.
  • Effective at keeping the greenhouse cool during hot temperatures.
  • The thermostat maintains a constant temperature.
  • Sturdy construction that is easy to set up.


  • Thermostat accuracy is not perfect and may require adjustments.
  • It may not work well in large greenhouses.

3. Mr. Heater Portable Propane Forced Air Heater

Technical Specifications

  • Power Source: Propane 
  • Heat Output: 60,000 BTU
  • Heating Coverage: 1,500 sq. ft (139.4 sq. m)
  • Height: 13.5 In (34 cm)
  • Width: 8.8 In (22 cm)
  • Length: 16.0 In (41 cm)
  • Weight: 13 lb (5.9 kg)

The Mr. Heater Portable Propane Forced Air Heater is a powerful and reliable option for heating up to 1,500 square feet (139.4 square meters) of a greenhouse.

With a variable output of 30,000-60,000 BTU, it can run for a long time, making it an economical and efficient choice. It is designed to run quieter than a standard propane heater, which is ideal for use in enclosed spaces like greenhouses.

The heater is heavy-duty and ergonomically designed. It has a high-temperature limit switch for added safety anis easy to use.

Overall, Mr. Heater Portable Propane Forced Air Heater is a durable, reliable, and efficient option for any greenhouse heating needs.


  • Variable heat setting allowing different BTU outputs.
  • It heats the space quickly and efficiently.
  • It has a high-temperature limit switch.
  • Heavy-duty, ergonomic design.


  • The heater is loud when running at full power.
  • It doesn’t have an on/off switch. You have to plug it in and disconnect the plug to turn it off.

4. Dr. Heater Greenhouse Heater

Technical Specifications

  • Power Source: Electric (Fan and Forced Air)
  • Heat Output: 10,230 BTU
  • Heating Coverage: 240 sq. ft (22.3 sq. m)
  • Height: 15 In (38 cm)
  • Width: 10 In (25 cm)
  • Length: 10 In (25 cm)
  • Weight: 13 lb (5.9 kg)

Dr. Heater Greenhouse Heater is a reliable and efficient way to keep your tender plants from freezing during the colder months.

With its fan-forced air technology and precision temperature setting, you can create the best climate for your plants, ensuring they remain healthy and thrive.

Its heavy-duty steel housing and water splash protection provides a long-lasting performance with minimal maintenance. This heater is lightweight and portable, making it easy to move around and position wherever it is needed.

It has an adjustable thermostat control and built-in over-heat protection, ensuring your plants stay comfortable.

Overall, Dr. Heater Greenhouse Heater will give your young plants the warmth they need to grow and thrive until the cold has passed.


  • The heater can effectively keep a small greenhouse warm.
  • It is portable and easy to move around.
  • It has a heavy heating element and a good-quality fan.
  • Heavy-duty all-metal case.


  • The heater may not be suitable for larger greenhouses.
  • The thermostat can only be set with a dial and not to a specific temperature.

5. GASLAND MHA18B Propane Heater

Technical Specifications

  • Power Source: Propane
  • Heat Output: 18,000 BTU
  • Heating Coverage: 450 sq. ft (42 sq. m)
  • Height: 22.8 In (58 cm)
  • Width: 12.8 In (33 cm)
  • Length: 16.3 In (41 cm)
  • Weight: 20 lb (9.1 kg)

The GASLAND MHA18B Propane Heater is a portable cabinet heater ideal for small greenhouses.

The heater is equipped with tip-over and low oxygen shut-off safety features, ensuring reliable and safe use. Thanks to its mobile and compact design, this heater can be effortlessly relocated to different areas.

It has three heating modes (high, medium, and low) to maintain a pleasant warmth in the greenhouse. The heater outputs up to 18,000 BTU of heat and can warm rooms up to 450 square feet (42 square meters). It is also very quiet, which is perfect for a peaceful and calm greenhouse environment.

Overall, the GASLAND MHA18B Propane Heater is an excellent choice for anyone looking for an efficient and reliable heating solution for their greenhouse.


  • It can be used both indoors and outdoors.
  • It has 3 temperature settings: high, medium, and low.
  • The unit is very quiet compared to other propane heaters.
  • It can connect to a 20 lb. propane tank.
  • The heater is effective in heating the surroundings even in colder temperatures.
  • The heater is energy-efficient as a full propane tank lasts for a long time.


  • The unit is made of thin metal, which can easily bend.

6. Dura Heat Convection Heater

Technical Specifications

  • Power Source: Propane
  • Heat Output: 25,000 BTU
  • Heating Coverage: 600 sq. ft (55.7 sq. m)
  • Height: 13.0 In (33 cm)
  • Width: 11.8 In (30 cm)
  • Length: 11.9 In (30 cm)
  • Weight: 7.8 lb (3.5 kg)

The Dura Heat Propane Heater provides affordable and efficient heat in well-ventilated areas such as greenhouses that are up to 600 square feet (55.7 square meters).

This heater operates using propane gas and can produce heat output ranging from 15,000 to 25,000 BTU. Its 360-degree output convection heating system ensures that the heat is distributed evenly throughout the space, providing a warm and comfortable environment for plants.

Additionally, the existing auto safety shut-off feature ensures that the heater turns off automatically in the event of any malfunction or unsafe condition.

Overall, the Dura Heat Propane Heater is an excellent choice for greenhouse owners who want an affordable and reliable solution for keeping their plants warm during cold weather. Its simple operation and stable heat output make it an excellent option for temporary heating needs in various well-ventilated spaces.


  • Small and easy to use.
  • It provides a good amount of heat output.
  • Frugal on fuel.
  • Easy to light.


  • Expensive for its size.
  • The construction material is very thin.
  • It can be noisy.

7. Buyplus Electric Greenhouse Fan Heater

Technical Specifications

  • Power Source: Electric (Fan and Forced Air)
  • Heat Output: 5,118 BTU
  • Heating Coverage: 120 sq. ft (11.1 sq. m)
  • Height: 10 In (25 cm)
  • Width: 8.9 In (23 cm)
  • Length: 7.7 In (20 cm)
  • Weight: 3.7 lb (1.7 kg)

The Buyplus Electric Greenhouse Fan Heater is a versatile, portable, energy-efficient heating solution, making it an excellent choice for those who need to heat their greenhouse or patio.

The heater can quickly heat up the atmosphere and offers three heat settings – fan-only, low, and high heat. The fan-only option is beneficial during the hot season for air circulation without any added heat, while the adjustable heat settings allow for customized warmth.

Additionally, the heater’s energy-saving capabilities make it a cost-effective heat source that can help reduce overall heating costs. Plus, it includes overheating protection, ensuring peace of mind while in use.

Overall, Buyplus Electric Greenhouse Fan Heater is compact and easy to move around, making it an excellent option for various spaces.


  • Low-cost small greenhouse heater.
  • Effective in maintaining a steady temperature.
  • Operates Quietly.
  • Compact and energy-efficient.


  • Not suitable for large greenhouses or outdoor spaces.
  • Does not have a thermostat control.
  • It has a short cord.

Our Top Picks For Best Greenhouse Heaters

Best Overall

Big Buddy Heater (Propane)

Best Electric Option

Bio Green Palma Heater (Electric)

Best Budget Option

Buyplus Fan Heater (Electric)


Why Get A Greenhouse Heater?

  1. Extend the Growing Season
  2. Protect Your Plants
  3. Maintain Optimal Temperature
  4. Increase Yield

1. Extend The Growing Season

A greenhouse heater can extend the growing season by providing heat during colder months. This means you can start growing plants earlier in the year and continue growing them later into the fall or winter.

2. Protect Your Plants

A greenhouse heater can protect your plants from cold weather damage. Keeping the temperature stable allows your plants to flourish and develop without being harmed by the cold.

3. Maintain Optimal Temperature

Greenhouse heaters can maintain the optimal temperature for your plants, regardless of the weather outside. This is especially important for plants sensitive to temperature changes.

4. Increase Yield

A greenhouse heater can increase the yields of your crops by allowing plants to grow for longer and promoting healthy growth. This means you can harvest more fruits and vegetables.

What To Look For When Buying A Greenhouse Heater?

What to Look for When Buying A Greenhouse Heater?
What to Look for When Buying A Greenhouse Heater?

When choosing the greenhouse heater, there are several factors to consider.

  1. Greenhouse Size
  2. Outdoor Temperature
  3. Fuel Source
  4. Greenhouse Insulation
  5. Heating Capacity
  6. Static or Forced-air
  7. Thermostat Controls
  8. Fire Safety

1. Greenhouse Size

The size of your greenhouse will determine the amount of heating you’ll need. A larger greenhouse will require a more powerful heater. On the other hand, a small greenhouse will need a small heater.

It’s important to take the size of your greenhouse into consideration when selecting a heater. This will ensure that it can effectively heat the space.

2. Outdoor Temperature

If you live in an area with harsh winters and freezing temperatures, your greenhouse will need a powerful heater to withstand those conditions and keep your corp warm. On the other hand, if your winters are relatively mild, you may get away with a less powerful heater.

It’s essential to consider the average outdoor temperature in your area when selecting a heater.

3. Fuel Source

Greenhouse heaters can be powered by various fuel sources, including electricity, natural gas, propane, and kerosene. Each fuel source has advantages and disadvantages, so choosing the most cost-effective and readily available in your area is crucial.

4. Greenhouse Insulation

A well-insulated greenhouse will retain heat more effectively than a poorly insulated one. If your greenhouse is poorly insulated, you may need a more powerful heater to compensate for the heat loss.

5. Heating Capacity

The heating capacity of a greenhouse heater is measured in BTUs (British Thermal Units). The higher the BTU rating, the more heat the heater can produce.

It’s crucial to select a heater with the appropriate BTU rating for the size of your greenhouse.

6. Static Or Forced-Air

Greenhouse heaters can be static or forced air. Stationary heaters use natural convection to distribute heat. In contrast, forced-air heaters use a fan to circulate warm air throughout the greenhouse.

Forced-air heaters are usually more effective at heating larger greenhouses. However, they can also pose a risk of burning plants if the hot air flow is directed straight at them.

7. Thermostat Controls

A thermostat is an important feature to consider when selecting a greenhouse heater. It allows you to set and maintain a constant temperature.

8. Fire Safety

Safety is a crucial consideration when selecting a greenhouse heater. Look for heaters with safety features such as automatic shut-off switches, overheat protection, and splash protection.

Which Type Of Greenhouse Heater Should You Pick?

Different types of greenhouse heaters are available. Each has advantages and disadvantages. Here’s an explanation of each type:

Electric Greenhouse Heaters

Electric greenhouse heaters are easy to use and require little maintenance. They are often small and portable, making them suitable for smaller greenhouses.

They do not produce harmful gases, making them ideal for enclosed spaces. However, they can be expensive to run, especially in larger greenhouses.

Propane Greenhouse Heaters

Propane greenhouse heaters are affordable and portable, making them great for smaller greenhouses. They are ideal for areas with limited power supply. However, they can produce harmful gases such as carbon monoxide.

Most models have automatic shut-off systems, but proper ventilation is necessary to use them safely.

Natural Gas Greenhouse Heaters

Natural gas greenhouse heaters are often more powerful and can heat larger areas effectively. They are also relatively cheap to run compared to electric heaters.

However, they are bulkier and produce harmful gases, so proper ventilation is required to ensure safety. They also require more maintenance, such as regular cleaning and fuel refills.

Solar-Powered Greenhouse Heaters

Solar-powered greenhouse heaters use the sun’s energy to heat the greenhouse. They are eco-friendly and require little maintenance once installed.

However, they are unsuitable for areas with little sunlight or during winter with shorter daylight hours. So, unless you need additional heat in your greenhouse during the summer months, solar-powered heaters may not be the best option.

How To Set Up Greenhouse Heater

How To Set Up Greenhouse Heater?
How To Set Up Greenhouse Heater?

Set up your greenhouse heater and keep your plants healthy and thriving all year round with these simple steps.

  1. Right Location. Choose the right location for your heater. Place it in an area where it can heat the entire greenhouse as evenly as possible.
  2. Stable Surface. Ensure that the heater is on a flat and stable surface. This will prevent it from tipping over and causing any accidents.
  3. Power Source. Connect the heater to its power source. Depending on the type of heater you have, this could be an electrical outlet, propane tank, gas line, or solar panel.
  4. Desired Temperature. Set the thermostat to your desired temperature. This will ensure that the heater turns on and off automatically to maintain a constant temperature.
  5. Test. Turn on the heater and let it run for a while to ensure it works properly.
  6. Monitor the temperature in your greenhouse regularly to ensure that the heater is working correctly and that your plants are getting the right amount of heat.

Tips For Keeping A Greenhouse Warm

Keeping a greenhouse warm can be a challenge, especially during cold weather. Here are some tips for maintaining a warm environment in your greenhouse.

  1. Insulate your greenhouse. Use insulating materials to prevent heat loss through walls, ceiling, and floor.
  2. Seal any gaps or leaks. Check for any openings that may allow cold air to enter the greenhouse and seal them off.
  3. Use a greenhouse heater. Choose a heater that is appropriate for the size of your greenhouse, and place it in a location that allows for even heat distribution.
  4. Use a thermometer. Monitor the temperature inside your greenhouse with a thermometer and adjust the heater if needed.
  5. Cover plants at night. Use frost blankets or other coverings to protect your plants from cold temperatures at night.
  6. Install a backup heater. Have a backup heater in case of power outages or fuel depletion.
  7. Ventilate during the day. Open doors and windows during the day to let fresh air circulate and prevent overheating.
  8. Consider using a greenhouse fan. A fan can help distribute heat evenly and prevent hot spots within the greenhouse.

Best Greenhouse Heaters, Frequently Asked Questions (FAQs)

Best Greenhouse Heaters Frequently Asked Questions
Best Greenhouse Heaters Frequently Asked Questions (FAQs)

How Many BTUs Do You Need?

The number of BTUs you need for your greenhouse depends on various factors, such as the size of the greenhouse, the level of insulation, the climate of your area, and the type of plants you want to grow.

A general rule of thumb is to have at least 5,000 BTUs per 120 square feet (11.1 square meters) of greenhouse space.

What Do BTUs Mean In Relation To Greenhouse Heaters?

BTU stands for British Thermal Unit, a measurement of heat energy. Regarding greenhouse heaters, BTUs refer to the amount of heat a heater can produce. The higher the BTU rating, the more heat a heater can generate.

How High Can The Temperature Get Inside A Greenhouse Before It Becomes Harmful To Plants?

A greenhouse can become too hot if the temperature rises above 81°F (27°C), as this can cause damage to plants.

How Can A Greenhouse Be Effectively Heated During The Winter Season?

An appropriately sized heating system for your greenhouse is the best solution for winter greenhouse heating. These systems include electric or propane heaters.

Adding a thermostat for temperature control, a fan for air circulation, and a backup power supply for “just in case” will increase the greenhouse heating effectiveness.

In addition, to prevent heat loss, insulate the greenhouse.

What Is The Most Efficient Greenhouse Heater?

The most efficient greenhouse heater is the one that matches the size of your greenhouse, has a high heating capacity, and is energy-efficient.

Propane heaters are often considered the most efficient option for heating greenhouses. This is because they are highly effective at quickly producing heat and are generally less expensive to operate than electric heaters.

Propane heaters can provide heat in areas without electricity, making them a versatile option for greenhouse heating.

That being said, electric heaters can also be a suitable option for heating a greenhouse, especially if there is a nearby electrical power supply. Electric heaters are generally more convenient and easier to use than propane heaters and do not produce fumes.


A good greenhouse heater is crucial for maintaining optimal temperatures and creating a perfect environment for plant growth. This article’s best greenhouse heaters offer different features and capabilities to suit various needs and preferences. With the right greenhouse heater, you can enjoy thriving plants even in the coldest months of the year.

Hopefully, you found the best greenhouse heater for your greenhouse. If you enjoyed reading our article, check out similar articles in our “Garden Tools” section.

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