10 Of The Best Space Heaters For A Greenhouse

When you first grow a tomato or cucumber on your own, it is extremely satisfying to know you can make something remarkably healthy and delicious for you and your family to eat. Not to mention you did it all yourself, so it makes you extremely proud, and rightfully so! However, winter is coming, which means you’ll have to stop growing for a season… or do you?

It may have occurred to you that greenhouses are for both summer AND winter, and now you are looking into investing in a greenhouse to continue to grow plants in the winter. We think that is a fantastic choice and encourage you to go for it!

You are currently doing so much research on how to get started. Come to find out, there is much more to it than you were initially expecting, especially when it comes to heating your space for a greenhouse. So the question today is, can you use a space heater in a greenhouse?

The answer is you can most definitely use a space heater in a greenhouse. In fact, convectional space radiators are the go-to choice when it comes to warming large greenhouses. This is because convection transfers heat from the radiator to the air instead of heating the objects. However, that does not mean you cannot use other heaters either. 

In this article, we are going to be going over a lot of great information. First and foremost, it is essential to know what type of space heater is a good choice for space heaters within the greenhouse and the importance of having a greenhouse heater in the first place. 

Can You Use A Space Heater In A Greenhouse?

As mentioned above briefly, you can use a space heater in a greenhouse. There are quite a few ones to choose from, so let us go over each kind individually. 

1. Convectional Fuel-based Space Heaters

Convectional fuel-based heaters are a great option because they heat a large area. These heaters are not designed to heat a smaller area and will need ventilation. This is because they emit carbon emissions that can be harmful to your and your plants’ health. So, keep these both in mind before purchasing one. 

However, these space heaters are named after their fuel sources (kerosene), natural gas, and wood, which is why they are meant to be used outdoors. Overall, they are a perfect way to heat your greenhouse if it is well-ventilated! 

2. Electrical Space Heaters

Most gardeners use electric space heaters because of how quiet and efficient they are. As mentioned above, electrical space radiators are safe to use and an immaculate source for heating your greenhouse. These heaters are used to heat a small greenhouse. 

Because these heaters function on electricity, you are better off using them in an enclosed space, especially if you do not have a well-ventilated area. If you are going to heat a larger greenhouse, it is important to note that you will need quite a few of them, which will result in a higher electricity bill.

There are a couple of heaters we will go over today that can heat a fairly large area, however, so keep on the lookout for that. 

The worst part of electric space heaters is that they can cause fires, so it is essential to make sure you never place your electric heater by somewhere that will get wet or cause a fire, either (i.e., bathroom, near furniture, or appliances.)

Always keep them 3 feet apart from any object, including your plants, and never leave or place anything on top of or near these heaters. 

There are two types of electric heaters to choose from:

  • Convection heaters: These heaters will heat the area up if the doors and windows are closed. These heaters will function just as effectively inside your greenhouse and household.

    They transfer heat from the warm heater to the surrounding air instead of heating up objects. Most convection heaters come with an adjustable thermostat, which is perfect for your greenhouse. 
  • Radiant heaters: These include infrared heaters that directly heat the objects within the space up instead of the room. They are a wonderful energy-saver compared to convection heating. If you wish to feel warmth without heating up the entire room, then these are the heaters for you. 

3. Oil-filled Heaters

Being one of the most popular and effective heaters out there, oil-filled heaters are extremely safe to use in a greenhouse.

This is because they do not cause fires, and most of them come with an automatic shutoff switch if the heater is to get too hot, as well as tip-over protection properties if anything were to occur. 

These heaters do not have a fan, so they emit heat through the oil inside an enclosed casing and radiates heat from the coils that come with the case in itself.

4. Ceramic Heaters

These heaters will function on electricity in a tiny box. Since they are tiny, these radiators are an excellent choice for smaller greenhouses. You can place them anywhere you want, and they offer a lot of advantages, such as:

  • Cool-touch exterior.
  • Fairly inexpensive.
  • Minimal fire risks.
  • Energy-efficient.

Why Is It Important To Have A Greenhouse Heater?

You might already know that greenhouses are excellent choices when it comes to providing your fruit and veggies with the extra success they need to thrive in winter conditions. It also helps prevent your plants from developing fungus and mold on them.

On the other hand, you may find that sometimes the cold weather may be a bit too much. This is where heaters are essential. 

When the temperature is inferior, a heater can counteract that by emitting heat into the air, especially if there is poor greenhouse insulation or you live in a colder region. 

What Type of Heater Is Best For A Greenhouse?

So now that we have gotten all of the general information out of the way, here are ten wonderful space heaters to warm up your greenhouse. 

HeaterWattageTypePrice
1. Lasko 754200 Space Heater1500 WCeramic$27.37
2. Mr. Heater Buddy4000-9000 BTUPropane$74
3. Brightown Heater750 / 1500 WCeramic$36.99
4. Bio Green PAL 2.0/US Palma BioGreen1500 WElectric$189
5. Bio Green PHX 2.8/US Phoenix Electric1000 / 1800 / 2800 WElectric$339.99
6. WSZYBAY Industrial Commercial Fan Heater25 / 1500 / 3000 WCeramic$149.18
7. Fahrenheat FUH Electric Heater5000 WElectric$309.45
8. Outdoor Infrared Heater1500 WInfrared$399.99
9. iPower Electric Heater Fan for Greenhouse 25 / 1500 WElectric$69.99
10. Palram GP 08 15 Greenhouse Heater1500 WElectric$349

1. Lasko 754200 Ceramic Portable Space Heater ($27.37)

Being first on our list, this Lasko ceramic heater is small and powerful. Coming in at 1500 watts, this radiator appears in 3 settings: high heat, low heat, and a fan for your summer needs when it starts getting relatively hot in your greenhouse. You can adjust the setting the way it needs to be with an alterable thermostat as well. 

On top of that, the Lasko 754200 comes with a carry handle, making it relatively easy to move around anywhere you need, and it is advertised that this small heater can warm up to 300 square feet. Just make sure to put the heater where it will do the most. 

In terms of safety features, the Lasko comes with an overheat protection that turns off automatically and has a cooling touch exterior that allows the body of the heater to remain cool even when the heat is on a high setting. This heater is also maintenance-free, so you can turn it on and forget about it, so to speak. 

2. Mr. Heater F232000 MH9BX Buddy ($74)

Being North America’s most popular propane heater, Mr. Heater will do excellently in heating your greenhouse this coming winter! The heater in itself radiates 4000-9000 BTU and can heat up to 200 square feet. When you wish to light the unit, all you’ll need to do is rotate the knob to pilot and push. The heater also connects directly to a 1 pound cylinder.

Mr. Heater comes with some safety features, such as an Oxygen Depletion Sensor (ODS) and accidental tip-over protection that will shut off so your plants can continue to enjoy the heat from this heater for years to come. 

The company does mention that they do not sell in Canada or Massachusetts, and it may shut off while operating in altitudes above 7000 feet, so it may not be the best choice if you live higher up. 

3. Brightown Space Heater ($36.99)

Although the Brightown is relatively tiny, it can heat up to 1500 watts on high heat, 750 watts on low heat, and an average cool blow fan for the summertime when it is getting rather hot to work in a greenhouse. You can heat a small area with the heater. 

Not only that, but the Brightown comes with an overheat protection and automatically shuts itself off if it is getting too hot. This small yet effective heater is quiet but continues to be robust.

The advertising mentions how you should not use this heater in a damp location such as the bathroom due to corroding heating elements. However, more than plenty of consumers have bought this strictly for their greenhouse with no issues.  

4. Bio Green PAL 2.0/US Palma BioGreen ($189)

Being our first Bio Green heater on our list today, these radiators are designed explicitly for greenhouses and would be one of your best bets when it comes to heating your greenhouse. It is ideal for many reasons—one of them being that it will be protected against the cold and frost when winter arrives. 

Bio Green has altered its heaters to be damp-proof and allows the air to move thoroughly and swiftly. Since this is an electric heater, it does not need a place to provide air circulation, as it already does this for you. This heater can efficiently heat a 120 square foot greenhouse and comes with an adjustable thermostat from 0-90 degrees Fahrenheit. 

5. Bio Green PHX 2.8/US Phoenix Electric ($339.99)

The second Bio Green that is going to be discussed is the PHX 2.8. This heater will warm more space and had a 2-in-1 option to hang it to the ceiling or place the radiator on the floor. This could be very convenient for you, especially if you are trying to get it in a place that heats the entire area.

This heater comes with some built-in features, including frost detection functionality, a heating and cooling setting (for ventilation), and a quiet yet smooth running fan. If you wish to have quiet and allow something powerful to run inside your greenhouse, this is the heater to get. 

6. WSZYBAY Industrial Commercial Fan Heater ($149.18)

This Industrial Commercial Fan Heater is perfect for a greenhouse for many reasons. First and foremost, it has waterproof heating, and secondly, this radiator has a cool-to-the-touch exterior, which is also an excellent choice if you wish to use it inside your own home.

You can choose a three-speed heating temperature: first gear (25 watts), second gear (1500 watts), or third gear (3000 watts.) Not only that, but this heater has no light or pollution, so there is no need to worry about carbon monoxide poisoning for you or your plants. 

It comes with a built-in timer and overheats protection, so you will not have to worry about anything, whether you are using this heater for your greenhouse or simply inside your home by taking a bath in the winter times. 

7. Fahrenheat FUH Electric Heater ($309.45)

Coming in at a total of 5000 watts, this electric heater is an excellent choice, not only for your greenhouse but for garages too. Overall, the Fahrenheat is a heavy-duty heater that will warm up any open space with temperatures ranging from 45 to 135 degrees Fahrenheit. It will provide the level of comfort you and your plants need for the horrid winter weather. 

This heater comes with a ceiling-mounted bracket for both vertical and horizontal mounting and has an adjustable louver, so you can aim it to the spot where you prefer the most heating. 

The safety features include an automatic shutoff button that prevents overheating and automatically reactivates when the radiator’s heat is back down. You can also change the thermostat to whatever warmth is most comfortable for your plants. 

8. Outdoor Infrared Heater ($399.99)

Being the only infrared heater on our list today, this radiator will do you justice. Not only can it be placed on a stand, but you can also hang it up or put it on the wall. If you have a reasonably large greenhouse, it may be best to get a few and hang the radiators up in areas that need it the most. 

This outdoor infrared heater heats up within 10 seconds and comes with a digital thermostat so you can tell what the temperature is. Not only that, but it comes with a safety precaution of overheat protection and is 100% made safe by being weatherproof from rain and snow. 

You can choose four heat options and have a 9-hour timer. However, it requires lithium-ion batteries (included in the purchase), so consider this before purchasing. 

9. iPower Electric Heater Fan for Greenhouse ($69.99)

iPower is yet another less expensive option. It can efficiently heat up to 160 square feet and is specifically designed for outdoor usages, such as garages, workshops, offices, and greenhouses. This product comes with a 1-year warranty and is spray waterproof. 

Another excellent feature is that iPower is once again another heater that comes with overheat protection. However, it is suggested that if this is the case, you should unplug the heater to allow it to cool down for another 10 minutes until you restart, so make sure you find that sweet spot in the middle. 

On top of that, you will find that this heater has a powerful thermostat controller ranging from temperatures to -40 to 176 degrees Fahrenheit or Celsius, depending on your preference. 

10. Palram GP 08 15 Greenhouse Heater

As we end the best greenhouse heaters, we leave you with the Palram GP 08 15. This heater will go around a 150-foot room with no issues. This radiator comes with a heating sensor for within the space and a humidity sensor, so you can quickly look it at with their digital thermostat. 

Palram is designed to be splash-resistant and ensures many years of accurate climate control. Overall, you will not be disappointed with this product! 

Final Thoughts

It is an incredible privilege to own a greenhouse right beside your house. However, it is also good to know that you will not have to worry about your plants going bad during that time! 

Photo of author

Hubert Miles

I've been conducting home inspections for 17 years. I'm a licensed Home Inspector, Certified Master Inspector (CMI), and FHA 203k Consultant. I started HomeInspectionInsider.com to help people better understand the home inspection process and answer questions about homeownership and home maintenance.
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