Best Heaters for Cannabis Grow Room & Grow Tent

Cannabis industry is an area that has experienced massive growth in the recent past and continues to do so. The booming industry is not actually one industry but an industry involving several service industries such as the growers of cannabis.


Growing cannabis is not an easy job. A cannabis grower has to look out for many elements that affect the cannabis like humidity and temperature. When it comes to humidity, a good humidifier for grow tent will do the trick.  It is very important that the temperature of the grow room is suitable for the growth of the cannabis. Here, the rule of thumb is that if the temperature is comfortable for you then it is comfortable for your plants. Therefore, in case you have a grow room or you are planning to start one, you need to consider getting a heater if you do not have one already.

Why do you need a heater for your marijuana grow room?

Marijuana plants thrive in temperatures of 20 to 30 degree Celsius. This means that if the temperature goes down, then the marijuana is going to grow slowly resulting to low yields.

However, if the temperature is low for a long period, then the effects are going to be much worse than just low yields. It is for this reason that you need to have a grow room heater that is going to regulate the temperature of the cannabis grow room and ensure that the temperature in the grow room is conducive for the growth of the cannabis.

Besides the low yields, low temperatures can also result into the growth of mold on the cannabis thereby rendering the cannabis useless. The following are some of the best heaters for cannabis grow room

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Lasko 5409 Ceramic Portable Space Heater with Adjustable Thermostat

One of the great features of this heater made by Lasko is the built-in handle and the three quite settings. The handle makes it easy for you to carry the heater from one point to another whether you are keeping it on the floor or on a tabletop.

With 1500 watts that provide comforting warmth, the heater will ensure that your weed stays warm even when the temperatures are cool. Controlling the heater is also easy as it features manual controls that are easy to use. In addition, the fan-powered delivery ensures that heater covers a 300 Sq. ft. area. It also has an adjustable thermostat and widespread oscillation.

Even though the heater is small measuring 8.34” x 6.55” x 11.66” in terms of length, width and height respectively, it works very well.  With this heater, you will not have to worry about leaving it on for too long because it has an automatic overheat protection feature that enables the heater to automatically turn off if left running for too long. Also, no worries of suffering from burn injuries when your bare skin comes into contact with the heater because the heater’ exterior stays cool when the heater is on.

However, be sure to place it on a stable tabletop or surface where there is no fall risk to avoid accidents. This is because the heater continues to run even when it has fallen down.

Stiebel Eltron 074058 120-Volt 1500-Watts

This heater features an amazing surface mount design and a quality construction with plastic and steel to ensure your cannabis grows in the best environment.

Made in Germany by Stiebel Eltron, a trusted brand, the heater also features a quite operation and is equipped with a built-in thermostat for an easy time when adjusting the heat. Another amazing feature of the heater is the frost protection setting which ensures that the temperature remain above freezing points even with the lowest thermostat setting.

The great design of this heater means that the heater is not only good-looking but is also works nicely in maintaining a warm temperature for the cannabis grow room.

Vornado MVH Whole Room Vortex Heater, Black

Made by Vornado, this heater applies vortex technology to fully circulate heat evenly throughout the marijuana grow room. Besides the Vortex technology, another great feature of the heater is the tip-over protection and the automatic shut-off feature, which makes it easy for you to use the heater without having to worry about any accidents caused by the falling of the heater.

This is because the two safety features ensures that the heater shuts off when it falls or tips over. In addition to the safety features, the heater has three heat settings of 1500W, 1125W and 750W making it easy for you to monitor or control your energy consumption.

The heater has a nice size, it is light and is also good looking. However, its ability to heat the room depends on the size of the room and whether the room can be closed in order to keep the warmer air in.

DeLonghi EW7707CM Safe Heat 1500W

With this heater, you can safely heat the cannabis grow room without having to worry about the heater overheating. This is because this heater features a thermal shut-off that shuts of immediately the heater begins to overheat.

Besides the guaranteed safety, this heater also provides great comfort because it features multiple heat settings and an adjustable thermostat. Even though the heater weighs 23.6 pounds, it features wheels that require no assembly making it very portable.

With this heater, you get to save money you would have spent paying for the high electricity bills. To save energy, simply press the ComforTemp button. The heater also features a maintenance free system, which means that you do not have to ever worry about refilling the oil in the heater because the oil system is sealed permanently.

DeLonghi EW7707CB Safe Heat 1500W ComforTemp Portable Oil-Filled Radiator – Black

This is another heater made by DeLonghi. Just like the previous heater from the same company, this heater works great in ensuring that the temperature of any room remains warm. With this heater, you will not have to worry about the size of the room because the heater will effectively keep the temperature in a medium or even large room, comfortable for you.

With 1500 watts of heating power, the heater features an adjustable thermostat and three heat settings so you can set the heater according to your temperature needs. To save energy, the heart has ComforTemp Button, which automatically maintains the optimal room temperature thereby saving energy. It also has wheel for easy transportation. For safety purpose, the heater features a thermal cutoff that prevents it from overheating and an anti-freeze setting to prevent freezing pipes.

However, the heater shows no actual temperature and you can be burnt if you touch the radiator fins.

Honeywell HCE100B Heat Bud Ceramic Personal Heater, Black

Made by Honeywell, this heater will work great in keeping your cannabis grow room warm. Furthermore, you get to save energy when you use this heater because the heater only uses 250 watts of electricity.

The highly portable heater, is also very easy to use and only features two heat settings, a low heat setting of 170 watts and a high one of 250 watts, and one button controls. For safety, the heater has a tip over switch, overheat protection and cool touch housing.

Another great thing about the heater is that it  small enough to fit in any space and comes in fun colors. However, there is no much difference between the two heat settings.

Brightown Space Heater 750W/1500W

Weighing just 3.55 pounds with a convenient handle, moving this heater from one place to another is very easy. This Brightown Space heater also features three heating settings of normal cool blow fan, 750-watt low heat and 1500-watt high heat.

It also has an adjustable thermostat that allows you to save energy by simply lowering the thermostat settings. Furthermore, with this heater you will not have to worry about safety because it automatically shuts of when it starts to overheat. The heater gives off powerful and radiant heat and is perfect for medium sized rooms.

Portable Electric Space Heater with Thermostat

The great thing about this heater from GiveBest , is t you do not have to wait for long before it heats up the room to your liking. The heater is made in such a way that it is able to produce large amounts of heat within seconds.

Despite its small size of 6.4 x 5.4 x 9.4 inches, the heater features three changeable temperature modes of 1500 watts, 750 watts and a fan mode. To get your preferred temperature, simply turn the selection knob. For safety purposes, the heater features the overheating and the tip-over protection. The heater automatically shuts off when it tips over and also when the temperature inside reaches unsafe levels. The heater is able to restart once the inside temperature is back to safe levels.

However, the surface of the heater can get hot when in use so it is best that you prevent any contact between the surfaces of the heater and your bare skin so that you avoid getting burnt. Also, keep materials that are combustible away from the heater as they can easily catch fire.

Pro Breeze 1500W Mini Ceramic Space Heater

This heater from Pro Breeze features ceramic heating technology , which enables it to provide efficient heating for your cannabis grow room. You also get to control the temperature according to your liking because the heater features an adjustable thermostat that is easy to use. The thermostat also monitors the temperature.

Measuring 7.1 x 5.8 x 9.7 inches, this heater is small in size and you can easily transport it wherever you want with ease because it is also highly portable with a weight of only 2.87 pounds.

In addition, the heater features a flexible heat control system where you get to choose between a fan, a low heat of 750 watts or a high heat of 1500 watts.

In addition, this heater has an anti-tip-over switch and a built-in overheat protection, which makes it a great grow tent heater because it automatically switches off in case it tips over or overheats.

Gazeled Space Heater Electric Heater Portable PTC Ceramic Heater

One of the great features of this heater is the 70-degree self-oscillation that provides fast heating to a wide area within a short time. On top of that, this heater made by Gazeled, has an adjustable thermostat for personalized temperature setting.

The heart is able to fit in almost any space because of its small size. However, despite the small size, the heater can warm up a room effectively with its power supply of 1500 watts. In case you want to save on energy, you can do that by switching to a power supply of 800 watts rather than the 1500 watts.

To ensure safety when in use, this heater has both the overheating and the tip-over protection features, which means that the heater automatically goes off when it overheats or tips over. Once the temperature goes back to normal, it will then restart.

In addition to the above great features, this heater also has convenient handles and it is very quiet when operating.

How does a grow room heater work?

A grow tent heater works by ensuring that the temperature in the grow room is conducive for the growth of cannabis. The heater has a thermostat for regulating the temperature levels, and uses electricity. It features an on/off button that you press when turning it on or off. Once turned on, the heater produces heat that keeps the room warm.

As mentioned in this article, cannabis grows best under temperature range of between 20 and 30 degree Celcius. Majority of the heaters mentioned above are small in size making it easy for them to be placed inside the grow tent. However, in case the heater is too powerful , then you have to place it outside the grow tent. Also, be sure that the heater is too hot when you are placing it inside the grow tent.

To ensure that the grow room heater works best, it is advisable to keep the grow room sealed. This will prevent the warm air inside from coming out and the cold air from outside from getting in the grow room.

Buying Guide: Choosing the right grow room heater

Below are some of the factors that you should look out for when shopping for a grow room heater:


To avoid any accidents in the grow room, you need to consider safety when using the heater. Some of the accidents caused by heaters include burns when the heater comes into contact with bare skin. The other accident is when the heater is a source of fire in the grow room especially when it overheats.

One way that most heater brands ensure safety is by equipping the heater with a sensor that automatically shuts off the heater when it overheats. Once the temperature lowers, the heater restarts. The other safety feature found in some heaters is the tip over protection. The tip over protection ensures that the heart stops working once it tips over.

Also, make sure that the heater has been tested by a recognized laboratory like ETL (Intertek). This will ensure that the heater’s construction and performance is safe for use since it has been checked and approved by the laboratory.


Whether you want the heater to be portable or not is up to you. However, since you are going to leave it in the grow room, the portability of the heater will not surpass the quality and safety of the heater since you are going to leave it in the same spot once you get the perfect spot in the grow room to place it. Nevertheless, there may come a time when you may want to move the heater and this is when portability comes in. To ensure easy transportation during such times, you can therefore either go for a heater with rollers or a small heater.

The size of the grow room

Grow tents come in various sizes including 4×8, 3×3 and 4×4.  If you are considering to get a 4×4 grow tent, it is best you get the best information to help you pick the best 4×4 grow tent. Choosing a grow tent with the right size is crucial because if the grow room is large, then you have to pick a heater that will provide enough heat for the whole space. In this case, a fan-forced heater will work better than any other kind of heater.

There are industrial sized heaters that quickly warms up a large room while maintain the circulation to keep the room warm.

For smaller grow rooms, the choice is endless as long as the heater works well. However, ensure that the heater does not give out too much heat, which can have adverse effects on the cannabis.


You probably want a heater that is going to heat up the grow room fast. If that is the case then you need to consider purchasing an oscillating heater. Oscillating heaters work by rotating as heat is fan forced throughout the room. Another great thing about oscillating heaters is that they can work as fans to bring down the heat in the grow room during summer months. The fans can also help in eradicating the bad smell in the grow room. However, if you want to effectively get rid of the bad smell, then you should consider getting a carbon filter.

Types of heaters:

Radiant & Infrared Heaters

Infrared and radiant heaters wok by radiating heat towards the objects in front of them, This means that instead of warming up the air in the grow room, these heaters heat the cannabis plants. This means that very little to no energy is wasted.

However, these heaters are only ideal in small rooms. The great thing about the radiant heaters is that they save tons of energy.

Ceramic Fan-Forced Heaters

Among all the types of heaters, ceramic heaters are the most popular. This is because they heat up the room very fast. When gong for a ceramic fan forced heater, you are going to be spoilt for choice because of the variety of fan heaters from those with timers, oscillation to the heaters with remote control features as well as digital thermostats.

These heaters have multiple fan settings that make it possible for you to control the speed of the fan as well as choose an option that saves more energy when the temperature of the room is not so low.

Baseboard Heaters

Baseboard heaters are the best choice for you if you want a heater that you can safely mount in the grow room. These types of heaters are not designed to be portable but are permanent heaters. They emit heat by using an element or fan.

These heaters are able to heat up a room in just a few minutes and they are also cold to touch when working hence making them safe for use.


From the above review of heaters, one thing that is clear is that there are countless models in the market for you to pick from. From radian heaters to ceramic fan forced heaters, you are definitely going to be copilot for choice. The heaters also have very many diverse features so you have to be careful when making your choice.

Hopefully, this guide has been helpful to you in your search for a great heater for the cannabis grow room. Whichever heater you pick, make sure that it takes care of factors like overheating and tip overs.

Top Selling Grow Tent Heater On Amazon:

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Bowden draws from over a decade of home growing experience as well as consulting for small-scale and hobbyist-level growers. He has written hundreds of articles, thought pieces, and tutorials about growing cannabis at home

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