The air temperature in your grow tent needs to be able to sustain your plants through each grow phase. There are times when your plants need to be kept warm in order to keep them well-nurtured and ready to flower.

In some cases, your grow lights will dissipate enough heat to keep the grow area at the right temperature. But if you’re using low-heat bulbs, or working with a small number of lights, you might need to bring in an additional heater to keep your plants happy.

Space heaters provide additional warmth to a chilly grow tent, especially when your grow lights do not dissipate sufficient heat.

Not all heaters you will come across in the market have the ability to heat your growing environment optimally.

Before choosing a grow tent heater, you should research the temperature requirements of your growing space and then select a model that fits your needs.

There are hundreds of heaters on the market, and it can be confusing to know which one works the best for cannabis plants.

In this post, we’re breaking down the top heaters we’ve found to work well for growing marijuana indoors.

Last Updated: March 17, 2020

ProductRated Power Special FeaturesPrice
Badger50,000 BTUsRheostat for Fan Control
View on Amazon
Pro Breeze1500 WattsCeramic Elements, Tip-Over Switch, Overheat Protection, Adjustable Thermostat
View on Amazon
Lasko Designer Series1500 WattsAdjustable Thermostat, Overheat Protection, Oscillating, Built-In Timer
View on Amazon
Opolar1500 WattsAdjustable Thermostat, Tip-Over Switch, Overheat Protection
View on Amazon
Gazeled1500/750 WattsAdjustable Thermostat, Tip-Over Switch, Overheat Protection
View on Amazon

Top 5 Heaters for Your Cannabis Grow Operation

#1 Badger Hanging Space Heater

The Badger Hanging Space Heater is one of the best heaters for smaller grow spaces.

It’s perfect for indoor gardens, grow tents and greenhouses. It uses hot water as the heating element, and it’s capable of delivering 50,000 BTUs while working with your hydroponics system.

With this model, you won’t have to deal with wires or complicated ducting. Instead, the heater works with return and inlet pipes that are super easy to install.

The manufacturer knows that every user has different needs, and as such, they provide you with nine different styles of the Badger.

The heater doesn’t have a thermostat, but it comes with a rheostat for controlling the speed of the fan. This helps to control the climate of the room and maintain the ideal temperature.

You are advised to hook the heat exchangers to a chilled water source or a boiler. However, you may need a drip pan if you choose to hook to a chilled water source.


  • A suitable choice for both small and spacious grow rooms
  • Easy to install, inlet piping system
  • Available in nine different styles
  • Comes with a rheostat for effective fan speed control
  • Can easily be mounted/installed on a wall or ceiling


  • Not very user-friendly if you’ve never used a space heater before

#2 Pro Breeze Mini Space Heater

The Pro Breeze 1500W Mini Space Heater is a great heating solution for beginners who are only using small grow tents. It’s a small heater that delivers a lot of heat while minimizing power consumption.

Unlike conventional models, the Pro Breeze uses heavy-duty ceramic heating elements to supply ultra-warm temperature transfer in small rooms and grow spaces.

Ceramic heating is a safer, faster, and more efficient technology of increasing the temperature of a growing environment compared to traditional space heaters.

This mini model has three operating features, fan, low (750 watts), and high (1500 watts). There is an built-in thermostat that helps to maintain optimal temperatures.

This is also a safe heat unit to operate because it features tip-over and overheat protection mechanisms. It will instantly turn off when overheating or tipped over. Your room will always get just enough heat.

Apart from the usual operating features that come with this model, you can also plug it into a reliable programmable timer for better control.


  • Energy-efficient compared to other models
  • Three thermostat varieties for optimal performance
  • Built-in, auto-off safety features
  • Light, compact, and portable
  • Doesn’t make a lot of noise


  • May not be powerful enough for larger grow areas

#3 Lasko Designer Series Space Heater

The Lasko Design Series are some of the popular space heaters in today’s market, with over three thousand satisfied users.

This oscillating indoor ceramic heating unit with remote control offers a unique way to control the climate of your growing environment. It features a built-in exhaust fan to cool the room as quickly as it heats it.

Its decorative metal base blends stunningly with the surroundings of your grow room. The design is also highly durable.

The unit comes paired with a multifunction remote, an adjustable thermostat, and an electronic cool touch control operation, the unit is remarkably easy to use.

The seven-hour timer, two heat settings, and two quiet settings allow maximum control. You can increase the temperature in increments of five from 60 degrees Fahrenheit to the maximum.

The 1500 wattage heater comes fully assembled. So, you can enjoy its looks, comfort, and high performance right out of the box.

This heater is highly energy efficient. Apart from what it needs to power the oscillating fan, all power that goes in is converted into heat.


  • Stylish designs
  • Adjustable thermostat for optimal temperature control
  • Easy-to-read LED temperature display
  • Programmable built-in timer
  • Built-in safeguards for overheating
  • Built-in Oscillating fan to evenly disperse heat


  • Uses a lot of power and may require it’s own surge protector

#4 Opolar 1500W Ceramic Space Heater

The Opolar 1500W Ceramic Space Heater is stylish and compact, making it perfect for your grow room. The model is available in delight, bright yellow, and blue colors.

The unit comes with a durable construction that is not the only ETL approved but has tip-over protection. You’ve also got a comfortable carrying handle.

Portability is at a premium with the Opolar. It won’t take up much space in your growing area. It is perfect for small spaces.

It has a superior thermostat control that gives consistent heat. The heater will turn off if the grow space temperature is warmer compared to the thermostat settings.

You should expect the unit to turn back on when the ambient temperature is less than that of the thermostat temperature settings.

This is a very powerful but quiet running unit that is capable of outputting up to 1500 watts. The noise level is barely 50 decibels.

You’ve also got built-in safety features, including overheat protection and tip-over switch. The unit will automatically shut off when overheating or knocked down.


  • Portable design that is easy to reposition
  • Built-in safety features for overheating and tip-over
  • Reliable thermostat settings that guarantee consistent temperatures
  • Creates less than 50 dB of noise
  • Comes with a convenient carrying handle


  • Some users report that it does not last as long

#5 Gazeled Space Heater

Do you want a cozy grow room climate in chilly winter? Choose the Gazeled Space Heater. It offers the most efficient way to boost the warmth of your growing environment.

It features heavy-duty construction that is small, compact, and durable. The design is also stylish and quiet running.

It is equipped with an adjustable thermostat that helps to maintain optimum grow room temperatures. The unit won’t turn on if the room’s climate is warmer.

It is fitted with an easy to navigate control knob that has three settings. You can choose a fan, high, or low settings. The heater outputs up to 1500 watts.

It also comes with two built-in safety features: tip over and overheating protection. The unit will turn off automatically in case of overheating or when it tips over.

Apart from being portable, this model comes with an integrated carrying handle, which makes it easy to reposition.

You’ve also got a UL listed heavy duty cord, which is six feet long for superior maneuverability.


  • Small, compact, and durable construction
  • The adjustable thermostat ensures the optimal room temperature
  • Easy to control three-setting knob
  • Features tip over and overheating protection
  • Comes with an easy to carry handle


  • May trip your electric circuit

What Kind of Heater is Right for you?

Space heaters allow you to quickly and conveniently raise the climate of your growing environment.

They’re available in many different styles and sizes. When you are preparing yourself to make a purchase, you have to confirm if the unit is adequate for your grow room.

Here are the main pointers we considered when selecting our 2019 top five models:

Type of Heater

When choosing a specific brand or style, you have to think about the space you’re trying to heat. Electric grow room heaters are usually suitable for small and medium areas.

Electric units are the safest and most efficient for indoor growers.

Electric Heaters

  • Radiator Heater: A radiator heater with a ceramic heating element instantly heats the grow space in front of it instead of the whole room. These electric units are cheap to buy; however, the element gets hot too fast. It is a good idea to keep them away from the reach of children.
  • Convection Heaters: Convection units have an electric heating element that heats the room and must have a fan that circulates the warm air to heat the room faster.
  • Oil Column Heaters: These units take a little longer to heat the grow space than fan assisted or ceramic heaters, making them ideal for more extended periods of heating. The surface of these units doesn’t get as hot as ceramic units; so, they are considered to be safer to use.
  • Fan Heaters: These are the smallest and most portable types of electric heaters. They heat a room faster than an oil column unit, but some models may be noisy.

Gas Heaters

Gas heaters are a better option for larger rooms because they heat the room quickly and cost-effectively.

These types of heaters can present safety problems. If you must buy a gas-operated unit, then look for one that comes with clearly defined safety features.

Power and Heating Capacity

As much as you want your growing environment to operate under optimum temperatures, you must be mindful of watts.

Watts are essential when buying a quality heater for a growing room because more watts means sufficient heat.

Typically, a unit uses ten watts to heat approximately one square foot of growing space. Therefore, a unit rated at 1500W should be suitable for heating most indoor gardens.

However, the efficiency or how well different units distribute heat varies. You can buy a larger heater with a higher rating, and a smaller model with fewer watts might outperform it.

Special Features

Most modern space heaters, especially electric ones, come with unique features. The first one being an built-in thermostat.

This feature responds to the temperature of the grow room by reducing the power or switching it off when the ambient temperature exceeds the thermostat setting.

Heating units with a fan are effective and fast at distributing heat. On the other hand, models that oscillate allow for even heating of the growing environment.

Some high-end models come with remote control for convenient operation. You can also consider units with a timer as they allow you to program the heater to turn off automatically.


It is also crucial to think about safety when shopping for a high performing heater for a grow room.

The most popular safety features that come with most models are: tip over and overheating protection.

These two safety mechanisms will trigger the unit to automatically shut off if the heater tips over or overheats.

You don’t have to worry about accidental fires in the basement when you are not around or near your grow room.

As far as safety is concerned, we recommend you keep your heater on the ground in the grow room and don’t use an extension cord (plug directly into the wall socket).

You should occasionally check the power cord for any damages. You can avoid unnecessary fires and injuries by ensuring the cord is not damaged in any way.

Final Words

For most indoor gardens, such as small marijuana grow rooms or tents, electric heaters are suitable for heating the core of the growing environment.

Always remember to program the thermostat or rheostat to avoid overheating your plants.

Don’t underestimate the smaller units. Some high performing compact units can do the job better than larger models.

Always keep in mind the safety of your home. Choose a model with surefire safety features, such as tip-over and overheating protection, to give you more peace of mind when growing indoors.

Scroll to Top