In winter, chances are that you need a greenhouse heater. I have a greenhouse attached to our house with a door separating it from my living space. Although it is not as cold outside, I need winter and early spring greenhouse heater.
In winter, you often need something extra to keep your plants warm in a greenhouse, and electric heaters, gas heaters, and fan heaters are perfect for heating any type of greenhouses.
This guide will help you choose the best greenhouse heater to ensure your favorite plants stay warm and happy throughout the year.
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Best Greenhouse Heaters
The best greenhouse heaters protect plants from the cold, are energy-efficient, and have sufficient power to heat the size of the greenhouse at hand. In addition, being spray waterproof, affordable, and long-lasting are other important factors. Some of the best greenhouse heaters available are the BioGreen PAL 2.0 USDT Palma Greenhouse Heater, the BioGreen PHX 2.8/US Phoenix Electric 3412/6141/9553 BTU Greenhouse heater, and Dr. Heater (DR218-1500W) Greenhouse and Garage Workshop Infrared Heater.
Best Greenhouse Heater: BioGreen PAL 2.0/USDT Palma Greenhouse Heater with a Digital Thermostat – Best Overall Greenhouse Heater
If you are looking for a long-term solution to protect your plants from cold temperatures, this Palma Greenhouse heater is a powerful yet energy-efficient choice.
This heater is great for any size of greenhouse because it can easily heat up to 120 sq ft of area.
It has a digital summer and winter thermostat (110V) that keeps you updated about the temperature.
It’s engineered in Germany to ensure efficient greenhouse heating.
The smart design evenly circulates the warm air throughout your greenhouse and removes cold air pockets.
The outer design of the heater is also simple and elegant; it fits any corner of your greenhouse.
The sensor cable can measure the ambient temperature of the greenhouse. This heater’s compact design makes it easier to place it anywhere in the greenhouse.
The floor-standing keeps the heater slightly raised from the floor of the greenhouse.
This is indeed a reliable heater that will last for several years. It’s inexpensive to operate compared to other brands, saving you a lot of money if you plan to use the heater continuously during the winter months.
It’s easy to operate because it comes with two dials. One is for adjusting the thermostat, and the other is for heating and ventilation.
The dial and the extra remote ensure accurate and effortless temperature control.
The technology used for this heater ensures no temperature peaks because they result in wastage of energy. It keeps the switching differential at a minimum for significant energy savings.
This heater has a dual function. Therefore, you can use it in summer as well for air circulation. This air circulation is essential for pollinating several vegetables and flowers in your greenhouse.
The dimensions for the heater are 11 x 8 x 12.5 inches. Although it’s designed for heating greenhouses, you can use it in your garage, workshop, or storeroom because of its portability.
- UL approved digital thermostat
- Easy to move with the top handle
- Stainless steel body
- Powerful heater with 5118 BTU/ 1500 W heating output
- Designed using durable components (fans, bearings, etc.)
- Comes with an extra remote for temperature control
- Energy efficient
- Spray waterproof
- Safe to use around plants
- Usable in both winter and summer
- Not noisy
- The cord is small
- Exposing it to outdoor weather might harm it
- The thermostat did not work for some customers
Buy this heater by clicking here.
Best Electric Greenhouse Heater BioGreen PHX 2.8/US Phoenix Electric 3412/6141/9553 BTU Greenhouse heater
This is another powerful heater by BioGreen. This is multifunctional equipment because it comes with three output options; 3412, 6141, and 9553 BTUs. These indicate how much area will be covered by the heater.
A warranty for your heater is useful, and BioGreen offers a 2-year warranty for this heavy-duty electric heater.
It comes with floor mounting brackets and hanging chains, so you can either hang it or mount it to a fixed location, depending on your requirement.
In my opinion, this particular heater offers multiple benefits because it can work as a heating and cooling device, so its useful in the greenhouse throughout the year. On top of that, the fan runs very smoothly and does not make any loud noise while operating.
You can run the fan alone or with the heater to improve air circulation within the greenhouse.
This will be a perfect pick if you are looking for something quiet. Other main features include frost detection, necessary for gardeners living in frost-sensitive areas.
The thermostat is exact, which helps you accurately control the temperature based on the plants growing in the greenhouse. You can easily regulate the temperature using the dial.
Since it was designed keeping in mind the operations in the greenhouse, it’s also splash-proof. So you do not have to worry if you drop some water on the heater while caring for your houseplants.
The dimensions of this electric heater are 18 x 15 x 11 inches. The body is made with rust-proof steel, which is important because the heater will be continuously exposed to the humid environment of the greenhouse.
- Dual setting – heating and cooling function
- Multiple BTUs and watts (1kW, 1.8 kW, 2.8kW)
- Can be hanged or mounted – 2 in 1 functionality
- Made with rust-proof stainless steel
- The fan runs smoothly
- Can easily ventilate any type of greenhouse
- Easy to operate
- It can be used in other areas like garages or sheds
- Since it is operated using electricity, it needs a 220V outlet
- Requires a particular type of plug to work properly which is not provided by the manufacturer
Best for Budget Greenhouse Heater Dr. Heater (DR218-1500W) Greenhouse and Garage Workshop Infrared Heater
This budget-friendly greenhouse heater is currently retailing for US$ 100.02 only. This 1500W heater can keep all your summer plants happy throughout the cold weather. You can easily create an optimum growing environment for all the plants in your greenhouse.
The fan-forced heating technology maintains the heat within the greenhouse so that the houseplants are never overheated. The precise temperature sensor prevents the hazards of overheating.
The fan keeps the greenhouse warm and provides better air circulation.
It covers about 150 sq ft of greenhouse area. The manufacturer has ensured this electric heater is safe to operate in the moist greenhouse environment by making it splash-proof.
You can easily move this heater within the greenhouse because it is lightweight. It’s portable, so shifting it from one location to another is not a hassle.
Some electric heaters require maintenance to keep them functioning, but this heater has no special maintenance requirements. This makes it an easy-to-use product for new and experienced gardeners, lasting several years.
The handle is made from steel, and the unique design makes it easier to place it on the floor or a shelf.
The dimension for this heater is 10 x 10 x 15 inches, so its not very bulky and can be placed anywhere in the greenhouse.
- It does not require extra maintenance
- Easy to use and move
- Built-in protection from overheating
- Automatic shutdown feature
- Withstands the high humidity of greenhouses
- It can be used for any small, medium, or large greenhouse
- The fans have metal blades, and the motor is built to last for several years
- Has only one output setting – 1500W
- Customers have complained that they have trouble honoring the warranty
- Gives two temperature settings (max and min) with no numbers, which makes it difficult to control the temperature
Best Small Greenhouse Heater OPOLAR Ceramic Space Heater with Adjustable Thermostat – Best Small Greenhouse Heater
We have discussed several heaters in this guide suitable for heavy-duty use, but what if you need a light-duty heater for a small greenhouse!
This ceramic space heater is perfect for small greenhouses for several reasons. It is compact, powerful, and provides quick heating. The exterior body of the heater varies in shades of yellow and black.
This heater operates on electricity and provides warmth by heating a ceramic element. Because of the ceramic heating method, this heater can provide continuous heating for your greenhouse.
One of the biggest advantages of ceramic heaters is that they eliminate fire risks. It does not contain any coils and combines forced fan and ceramic heating.
You can run three heating modes on this heater; high heat, low heat, and fan. Choose the mode carefully depending on the temperature in the greenhouse for optimum results.
The thermostat can be adjusted to maintain a certain temperature or ambient temperature.
There are two dials on the heater; one adjusts the intensity of temperature, and the other adjusts the heater mode.
Another most important feature of this heater is overheating or tip-over protection. People usually complain of internal damage to heaters because of overheating, but this will not be an issue for the OPOLAR ceramic heater.
This heater automatically shuts off if overheating is detected in any part. This protects the heater from damage and prevents any accidents in your absence.
You can easily move this heater within the greenhouse using the handle at the top.
- Portable and lightweight
- Multiple heating modes
- Low noise
- Easy, user-friendly operation and controls
- ETL approved
- Overheating protection
- Comes with a handle for easy handling
- Energy-efficient and long-lasting
- Not waterproof
- Can be damaged with continuous high-humidity exposure
- Some customers have complained about a significant increase in electricity bills after using this ceramic heater
- The cord length is small
Best Gas Greenhouse Heater Mr. Heater (F215100 MH4B) 3800-BTU Propane Heater – Best Gas Greenhouse Heater
This is one of the most reliable gas heaters available in the market. It is small and safe to use in indoor spaces like greenhouses.
It can easily heat a greenhouse or any other indoor space of 95 sq ft. Although it’s a propane heater, it does not emit any unpleasant odor while operating.
The simple on and off button makes the operation easy. It also ensures maximum safety with auto-shutoff, tip-over, and low oxygen sensors.
It can continuously run for about 5 hours on the maximum BTU. I would recommend placing it a few feet away from the walls of the greenhouse and the plants. The dimensions for this mini heater are 11 x 11 x 11 inches.
For ventilation, make sure the greenhouse has a small opening.
- Heat setting of 3800 BTU per hour
- Simple operation with a single on/off button
- Compact and lightweight
- Cheap to operate
- No unpleasant smell
- Heats the greenhouse very fast
- The propane cylinder is included
- The buttons on the heater are very stiff
- Does not offer precise heating control
Best Fan Greenhouse Heater – Comfort Zone CZ220 (5,000W) Fan-Forced Ceiling Mount Heater
If you are aiming to save floor space in your greenhouse, you should invest in this ceiling-mounted greenhouse heater.
It is constructed using heavy-duty, durable steel to help it withstand the greenhouse environment. It can tolerate temperature fluctuations without any significant impact on the body or the operation of the heater.
Once you mount it to the ceiling, it provides targeted heating, but the forced fan technology ensures even distribution of heat.
The temperature can be easily adjusted using the dual knobs thermostat.
If you are concerned about overheating, this product will resolve the issue with the smart safety feature. The safety sensor will automatically shut down the heater if any component heats up during operation.
- Saves floor space and keeps your plants warm from a distance
- Easy to install
- Sturdy steel body
- Easy temperature control using dual knobs
- Built-in overheating sensors
- Power light to indicate whether the heater is in use or not
- 1-year warranty
- Customers have complained about loose fan blades
Learn more about this heater here.
Best Electric Heater for Greenhouse
They are environmentally friendly because they do not release any harmful fumes.
They are the most efficient in maintaining a consistent temperature in greenhouses with minimal ventilation.
But keep in mind that they are the most expensive option.
They are easy to use and do not require refilling. If your electric heater has a thermostat, you can have better control over the temperature.
Winner: BioGreen PHX 2.8/US Phoenix Electric 3412/6141/9553 BTU Greenhouse heater
Choosing a Greenhouse Heater
Your greenhouse will require some extra warmth in autumn and winter. You might have to run the heater even in spring if you live in a very cold climate.
Your choice of heater can vary depending on several factors, including how cold it gets in your area of residence, is your greenhouse is insulated, and what type of heater is the cheapest to operate in your area.
When selecting a heater for your greenhouse, select the product that suits your budget and need. You can invest in an expensive heater if you want something long-term.
In my opinion, with the right knowledge, you can find a feasible heater that fits your long-term goal.
Focus on the following key points when choosing a heater for your greenhouse.
Size of the Greenhouse
When you start looking for greenhouse heaters, please focus on the size they are designed for. Greenhouse sizes can vary; therefore, a particular heater might not be suitable for a different-sized greenhouse.
You should already know the size of your greenhouse. If not, measure and know the actual area of your greenhouse.
For most greenhouse heaters, the area they cover is clearly mentioned in the description. This should be the first parameter for choosing a heater because if you end up buying a heater that is not designed to heat a large area, you are wasting your money and electricity.
Buying something expensive that covers more than required is also not recommended.
After size, price is the next consideration when buying a greenhouse heater. Before looking for heaters, decide on a budget to make things easier for yourself.
The prices for greenhouse heaters can vary greatly depending on the size, power rating, and area it covers. Having a budget in mind will help you filter out unnecessary options from the list.
Although this is a minor consideration, you should consider the sound you will tolerate.
If you want a quiet heater, avoid buying motorized heaters that make noise during operation. The fans in some heaters can also produce significant noise. Make sure you read the specs carefully to understand how the heater operates.
Type of Heater
You will find different types of heaters when shopping for them online or in stores. Common types are fan, electric, paraffin, halogen, and propane heaters. Although each serves the same purpose, i.e., heating the greenhouse, they vary in functionality.
Gas heaters are affordable. But many gardeners avoid using them because they emit fumes that might harm humans and plants.
Paraffin heaters are also cheap. In addition to heat, they also supply carbon dioxide, which is essential for plants. Before buying these, consider the availability of paraffin in your area.
Electric heaters are the easiest to operate if you have an electricity source in your greenhouse. I think a fan heater is a perfect choice for high-humidity places like greenhouses because it can even distribute the heat in your greenhouse.
Some people get confused by the number of options available in the market, but I recommend reading about how each type of heater works and selecting the type that suits your needs.
This is simply the measure of the heaters’ ability to heat up the greenhouse. I recommend investing in energy-efficient heaters because they ensure maximum power for energy consumed while operating the heater.
Type of Plants
Your choice of heater also depends on the type of plant you are growing in the greenhouse.
Some plants require more warmth than others; therefore, it is important to compare the temperature settings of the heater with the temperature requirements of your plants.
Nowadays, automatic heaters are available that will automatically turn off when the required temperature is achieved in the greenhouse. Once you adjust the temperature settings, the heater can turn on if the temperature drops below the set limit.
This type of heater can help you avoid energy wastage and even any dangerous incidents within the greenhouse.
Heaters with automatic operation can save you time and money since you cannot visit your greenhouse every other hour. They are also helpful when you are away from your greenhouse.
Temperature Control in Greenhouses
In winter, you can use a heater to maintain the necessary warmth within the greenhouse. For summer, you might have to invest in an evaporative cooling system.
I highly recommend investing in a heater with a dual function (heating and cooling) for long-term use.
Whatever type of heater you use, ensure it can withstand the required temperature during the day and at night. You can use an automated heater if the temperature fluctuates or drops below a certain level.
Temperature control in greenhouses in winter will not only help the plants stay warm, but the heater can also contribute to the propagation of seeds and seedlings.
Other Ways to Keep the Greenhouse Warm in Winter
Greenhouse heaters are a great way to control the temperature of your greenhouse during winter. I list a few other tips and methods to help you keep your plants happy in winter.
- Position your greenhouse so that one of the longer sides is exposed to direct sunlight. Ensure the other side is shielded with a fence or wall from cold winds.
- Build a DIY thermal mass around the greenhouse structure using black water containers. These containers should be filled with black water created using a dye. Make sure they have direct exposure to sunlight. These thermal masses will absorb and release heat during the daytime at night.
- Insulate the greenhouse’s interior to help minimize the heat loss from the greenhouse. You can use sheet foam or bubble wrap, depending on your choice. But if your greenhouse is plastic, sheet foam provides a higher level of insulation.
- Store the compost in your greenhouse in cold months to keep it warm and prevent the loss of nutrients.
- If you opt for a greenhouse heating system, install it in the fall before winter begins.
The size of your greenhouse and your budget are the two main considerations for choosing an appropriate heater. Avoid buying something that is too powerful for the requirement.
I have listed several options in this guide. Compare the prices and features to select the best greenhouse heater for your size of greenhouse and needs.
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Daniel has been a plant enthusiast for over 20 years. He owns hundreds of houseplants and prepares for the chili growing seasons yearly with great anticipation. His favorite plants are plant species in the Araceae family, such as Monstera, Philodendron, and Anthurium. He also loves gardening and is growing hot peppers, tomatoes, and many more vegetables.