7 Best Greenhouse Heaters Reviewed

Are you looking for a new, more effective heater for your greenhouse? Did you just get into gardening and are looking for new ways to keep your plants warm during winter. Whichever the reason for clicking on this article, we can help you. A greenhouse heater is going to be your plants’ best friend because it will keep them warm during cold days and maintain the temperature they need at all times. That being said, it is important to do your research before choosing a greenhouse heater. So keep on reading to find out more about where you can find the best greenhouse heaters and what are some of the factors you need to consider before purchasing one.

Best 7 Greenhouse Heaters

A greenhouse heater’s job is to heat your greenhouse and maintain a steady temperature for your plants in order for them to grow healthily. And although seemingly an easy enough job, there are a lot of different heaters for different purposes. Some greenhouse heaters might be too powerful for your plants, and some might not fit. For this reason, it is important to explore different options before making a decision. So without further ado, let us take you through our list of the 7 best greenhouse heaters, and then you can judge which is the right fit for your greenhouse.

BioGreen PAL 2.0/USDT Palma Greenhouse Heater with a Digital Thermostat

The BioGreen PAL 2.0/USDT Palma Greenhouse Heater is the perfect choice for small- to medium-sized greenhouses and it’s quite affordable to operate. With some awesome features like the high-quality electric cord and the digital summer and winter thermostat with different modes, this device is a very effective and cost-efficient purchase.

Key features

The main features of the BioGreen PAL 2.0/USDT Palma Greenhouse Heater are:

• Power source: corded electric
• Dimensions: 11 x 8 x 12.5 inches
• Weight: 10.8 pounds
• Ideal for heating up spaces up to 120² ft.
• Comes with a digital summer and winter thermostat 
• External and approved sensor cable that can measure the temperature of the greenhouse
• The heat elements are stainless steel
• 5118 BTU/ 1500 W heating output
• Relatively affordable to operate
• Maintenance instructions: dishwasher safe

Pros 

• Perfect for heating not only greenhouses but sheds, garages, milk-houses, and storage rooms
• The summer/winter thermostat is helpful during all the seasons to detect the ambient temperature of your greenhouse 
• Inexpensive to operate
• Portable and lightweight 
• Excellent customer service

Cons

• May not be ideal for extremely cold temperatures

BioGreen PHX 2.8/US Phoenix Electric 3412/6141/9553 BTU Greenhouse heater 

Another amazing electric greenhouse heater is the BioGreen PHX 2.8/US Phoenix Electric 3412/6141/9553 BTU Greenhouse heater. It comes in stainless steel build that endures every temperature and has three different heating options to fit your needs perfectly. In addition, it operates on a very low noise level and is spray waterproof.

Key features

The main features of the BioGreen PHX 2.8/US Phoenix Electric 3412/6141/9553 BTU Greenhouse heater are:

• Color: stainless steel
• Power source: corded electric
• Dimensions: 18 x 15 x 11 inches
• Features three different heating output options: 3412/ 6141/9553 BTU/ 1kW, 1, 8 kW, 2, 8 kW
• Cooling and heating ventilation setting
• Operates on smooth and quiet noise
• Comes with floor mounting brackets and hanging chains
• Spray waterproof
• Features a function that detects frost

Pros 

• You can use this heater not only for heating but cooling too 
• It comes with three different heat output options based on your preference
• Comes with its own tools to help you set it up
• Operates quietly and detects frost 

Cons

• Some reviewers would like a “plug adapter” to come with the heater to make it easier to set up

Dr. Heater (DR218-1500W) Greenhouse and Garage Workshop Infrared Heater

Dr. Heater (DR218-1500W) Greenhouse and Garage Workshop Infrared Heater is a perfectly made greenhouse heater that is lightweight, low maintenance, and portable. Due to its very compact size, this device is perfect for small to medium greenhouses and includes some amazing features like being waterproof from spraying and splashing.

Key features

The main features of the Dr. Heater (DR218-1500W) Greenhouse and Garage Workshop Infrared Heater are:

• Colors: green and black
• Dimensions: 10 x 10 x 15 inches
• Power source: corded electric
• Method of heating: radiant
• 1500w and comes with only one setting
• Keeps your plants thriving in the best climate for them 
• IPX4 structure
• This heater is protected against water splashing
• Ideal for heating spaces up to 150 square feet
• Portable and lightweight
• Very low maintenance

Pros 

• Portable and lightweight so you can easily move it around 
• Low maintenance so you don’t have to worry about a difficult set-up 
• It only comes with one setting but it provides the most appropriate climate for your tender plants

Cons

• The thermostat could improve

Mr. Heater (F215100 MH4B) 3800-BTU Propane Heater

If the electrical heaters are not your cup of tea, then you can’t go wrong with the Mr. Heater (F215100 MH4B) 3800-BTU Propane Heater. A very simple and portable device to use and also very effective and powerful. It uses propane as fuel, and propane is known for its efficiency and effectiveness when it comes to heating spaces. An amazing feature it includes is the sensor that detects when the oxygen percentage drops and it shuts itself off.

Key features 

The main features of the Mr. Heater (F215100 MH4B) 3800-BTU Propane Heater are:

• Colors: red and black
• Dimensions: 11 x 11 x 11 inches
• Method of heating: propane heater
• Power source: propane
• Ideal for heating indoor rooms up to 95 square feet
• 45 degree heating angle and odorless
• Features an automatic shut off system when it detects low oxygen levels
• Very simple to use; on/off button
• Maximum runtime is 5.6 hours
• For adequate ventilation when turned on, this heater needs a vent area of minimum 4 square inches
• Auto shut-off when accidentally tipped over for safety reasons

Pros 

• This heater keeps your greenhouse safe with its “automatic shut-off” feature in case it detects low oxygen in the room or the heater is accidentally tipped over
• Perfect for using in greenhouses, patios, porches, workshops, barns, sheds, picnics, shelters, and many more places
• Very simple to use and move around

Cons

• The on/off button was reported to be “stiff” to use 
• A reviewer reported a fire hazard when they dropped the heater while it was still on

Comfort Zone CZ220 (5,000W) Fan-Forced Ceiling Mount Heater

Like every plant lover that wants comfort for his/her plants, this heater will definitely put your plants inside their comfort zone. We are talking about the Comfort Zone CZ220 (5,000W) Fan-Forced Ceiling Mount Heater. With a hardwired system that is durable and safe, this heater is a beast. Since it is very portable and comes with the possibility to mount on ceilings, this device saves a ton of space. It includes self-shutting features, and the extremely easy-to-remove front grill makes it extra easy to clean and maintain.

Key features

The main features of the Comfort Zone CZ220 (5,000W) Fan-Forced Ceiling Mount Heater are:

• Color: white
• Power source: hardwiring
• Method of heating: forced air
• Dimensions: 17.88 x 14 x 14.5 inches
• This heater was designed for hard-wired installations and ceiling mounting, which can save a lot of floor space
• It is constructed with heavy gauge steel, which makes it durable 
• You can adjust the angle to direct the airflow where needed 
• Features smart safety details; it automatically shuts off it it overheats and there’s a light indicating when the heater is operating
• The front grille is removable so it’s easier to clean it
• Features three heating levels: 5000/4000/3000 watts plus thermostat control

Pros 

• If you do not have enough floor space, this heater is designed to save a lot of valuable floor space in garages, storage areas, or warehouses 
• The heavy steel construction of the heater helps it resist temperature fluctuations in rooms that are poorly insulated
• Adjustable airflow angles
• Smart safety features help you keep your greenhouse safe by automatically shutting off when it is overheated, and you can tell when it’s on by the light indicator on the unit
• Comes with three heating levels based on your needs 

Cons

• A reviewer reported that although the heater is highly effective, the fan is poorly assembled so you might need to adjust it

LightHouse 915mm Eco Heat Greenhouse Heater 

The LightHouse 915mm Eco Heat Greenhouse Heater is all you need to keep your plants healthy thanks to the consistent environment it provides. It comes in three different wattage models you can choose according to your needs. It is designed to protect your plants in cases where the temperature might fluctuate, and it is very power efficient.

Key features 

The main features of the LightHouse 915mm Eco Heat Greenhouse Heater are:

• Power source: corded electric
• Colors: green and black
• Weight of unit: 3.75 pounds
• Wattage: 135 watts, 80 watts, and 45 watts
• Designed to protect your plants in cases of temperature fluctuations or humidity fluctuations
• Uses less than 50 watts per foot which is 25% less than some tube heaters and similar to an ordinary light bulb
• Offers a stable environment

Pros 

• It comes in 135 watts, 45 watts, and 80 watts
• This tube heater is designed to keep your plants steady and healthy even during humidity or temperature fluctuations in the greenhouse
• It is as power saving as a light bulb and more energy-efficient than most tube heaters

Cons

• It does not have a thermostat

TONINGIO Outdoor Heater, Space Heater for Garage and Greenhouse with Thermostat 

If you’re on the lookout for a powerful and compact greenhouse heater then look no further because the TONINGIO Outdoor Heater, Space Heater for Garage and Greenhouse with Thermostat is calling your name. It evenly warms your plants with its PTC ceramic heating technology, and it features two modes, which you can switch to either high heat or natural wind based on your needs.

Key features

The main features of the TONINGIO Outdoor Heater, Space Heater for Garage and Greenhouse with Thermostat are:

• Color: yellow
• Power source: corded electric
• Method of heating: forced air and convection
• Dimensions: 9.8 x 7.9 x 11.8 inch
• Features a 89 inch long cord and floor mats
• Suitable to heat small areas
• Portable and lightweight so it is easy to carry
• It sends evenly heated flows of air in the room using its high speed fan and PTC ceramic heating technology
• Two modes setting: high heat and natural wind
• Safe smart features: it automatically shuts off when the heater overheats
• You can adjust the heating angle of the heater according to your preferences and needs because it has a 90 degree angle adjustable design

Pros 

• The long cord of the heater plus the fact that it’s lightweight makes it really easy to move around and carry it wherever you need
• Ideal for heating greenhouses, offices, and garages
• Its rapid heating design will spread the evenly heated airflow across the room so all your plants will be warm and safe
• Its safe feature is especially handy if the heater happens to overheat, in which case it will automatically shut off for your safety and the greenhouse’s

Cons

• A reviewer reported that the knob is a little difficult to turn

What to Look For When Buying a Greenhouse Heater

If you want to take care of your plants and garden as best as possible, you need to remember some factors that can definitely affect the health and lifespan of your plants. The temperature and humidity in your greenhouse are especially important in order for your plants to grow healthily and safely. So before hurrying to purchase a heater for your greenhouse, there are a few key factors you need to consider before doing so.

Size of the greenhouse 

The size of your greenhouse is definitely an important determinant of what type of heater to purchase for it. If your greenhouse is large, you will need to purchase a heater that has more wattage in order to maintain a healthy level of temperature for your plants. In some cases, you might even need to purchase two heaters to do the job. However, there is another addition to the size of the greenhouse, and that is its insulation. If your greenhouse is well insulated, it will be easier to heat it up even if it’s big. And if it’s not, we suggest covering the roof and walls of your greenhouse in bubble wrap in order to insulate it properly, which will result in a lower electricity bill at the end of the month.

Type of plant

The type of plant you want to grow and heat in your greenhouse is also a determining factor when purchasing a heater. See, some plants do very well and need higher temperatures to grow and thrive, whereas some others do not. If you’re growing vegetables such as beans, tomatoes, eggplants, peppers, and tropical plants, those do really well in high temperatures so you can definitely go ahead and purchase a heater with a higher wattage. 

Type of heater

And finally, of course, there are certain types of heaters that you need to familiarize yourself with if you want to make the best decision. There are two types of greenhouse heaters: vented and unvented. Both types are of course effective and helpful for your plants; however, there are some differences that you might want to consider. For example, vented heaters have more precision in the heating and more intensity in their fan speed. They are one-hole venting machines, and some models come with programmable thermostats and other features. On the other hand, unvented heaters are less expensive to install and easier to place wherever you want since they don’t require a wall to be vented. 

Conclusion

Humans need warmth, and so do plants. Purchasing the right greenhouse heater is not something to be taken lightly, because the lifespan and health of your lovely plants are at stake. The very purpose of a greenhouse is to be able to grow plants and/or vegetables all year long, so for each season, some adjustments may be required. So purchase one of these amazing greenhouse heaters and keep your plants warm all year long.