10 Best Greenhouse Heaters – Save Your Plants

Having a greenhouse allows you to grow plants in all climates. Keeping your greenhouse warm is necessary to maintain the health of the plants inside of it. If temperatures get too cold, your investment will not survive. With the best greenhouse heaters, you do not have to worry about hard freezes damaging your precious plants.

A top greenhouse heater needs to fill the space with warmth. It also needs to be energy-efficient and eco-friendly. Fortunately, greenhouse heaters do not run at the same rate as furnaces inside of homes, so you won’t need to pay as much to keep it going. But, you will need to pay attention to the moisture level in your greenhouse as heaters do not regulate the humidity in the space. Plants require water to stay healthy, so some of the more delicate ones could suffer if you have a heater taking the moisture out of the air.

To keep the greenhouse warm, you might need to pair your heater with some insulation on the ground, walls, or ceiling. You might also need fans to move heat around the greenhouse, although some heaters have their own fans. Greenhouse heaters tend to be rugged, especially when compared to household furnaces. Many are mobile, too.

Before you choose a greenhouse heater, you should have a good understanding of what your greenhouse lacks. You will need to evaluate the outdoor temperature, the temperature that your plants need, and the size of your greenhouse.

Our Top 10 Best Greenhouse Heaters

The 10 following greenhouse heaters are some of the best in the industry. They have features that gardeners appreciate, as the heaters have helped their plants flourish and grow. We have taken the time to test these in our own greenhouses so you can benefit from our experience.

Editor choice 1 Dr. Heater DR218-1500
Dr. Heater DR218-1500
(Best electric heater for greenhouse)

Dr. Heater cures the cold by keeping your plants warm and moist in the most frigid conditions thanks to the infrared heating technology!

Best seller 2 Lasko 754200
Lasko 754200
(Best Small Greenhouse Heater)

The Lasko portable heater offers big warmth in a small package. It’s very quiet yet efficient with 11 temperature settings.

3 Bio Green Phoenix
Bio Green Phoenix
(Best high-end greenhouse heater)

The Bio Green Phoenix uses German engineering to heat your greenhouse efficiently and effectively for long hours.

4 Mr. Heater MH9BX
Mr. Heater MH9BX
(Best propane radiant greenhouse heater)

Mr. Heater uses energy-efficient and safe propane to deliver radiant warmth to greenhouse.

Best value 5 Fahrenheat FUH54
Fahrenheat FUH54
(Best heater for large greenhouse)

When you need to heat up the Fahrenheits in your greenhouse, you can trust this mountable heater to save your plants from frigid temperatures.

6 Comfort Glow EUH341
Comfort Glow EUH341
(Best safety features in a small greenhouse heater)

With the Comfort Glow greenhouse heater, your plants can bask in the comfort of pleasantly warm temperatures.

7 Buyplus 01
Buyplus 01
(Best Innovative Greenhouse Heater)

Whether you are heating your greenhouse or a garage, this Electric Heater provides heat in any direction.

8 Homeleader
(Best Radiant Greenhouse Heater)

The Homeleader Portable Radiant Heater is the leader in quick space heating. It only takes two seconds to reach your plant’s desired temperature.

(Best Affordable Greenhouse Space Heater)

The ISILER space heater keeps your energy costs low while you warm up your precious little greenhouse seedlings.

Best price 10 VIVOSUN
(Best Greenhouse Heating Mat)

Why fill an entire room with heat when you can keep the seedlings warm with a Vivosun mat? The little pad warms your seedlings safely and efficiently.

1 Editor choice

Dr. Heater DR218-1500 – Best electric heater for greenhouse


  • Weight: 13 lbs
  • 1500 watts
  • Fan-forced infrared heat
  • Adjustable thermostat
  • Cool fan option
  • Precision-temperature sensor
  • Steel casing
  • Plugs into an electrical outlet
  • More powerful (220V/3000W) option is available

This heater is our top choice because it is designed for cold climates. The small, portable greenhouse heater is powerful and easy to move. The heater has an adjustable thermostat and fans that send warm air all through your space.

The infrared heater is energy efficient, but still provides 1500 watts of warmth. Infrared heat is less likely to remove moisture from the air when compared to forced-air heat. The unit has a heavy-duty steel housing, so it can withstand splashes and tough conditions. Moreover, this heater has a permanent lubricant, so it requires little-to-no maintenance.

The heater has a ball-bearing motor that lasts for years. The precision temperature sensor prevents the unit from overheating, to keep your delicate plants growing as they should.

  • Low voltage (120)
  • Compact and maneuverable
  • Easy to regulate temperature
  • Temperature sensor prevents overheating
  • Quiet motor
  • Splash-proof casing
  • No automatic shut off
  • Ideal for greenhouse measuring 8×10 or smaller
  • Needs to run continuously in extreme cold
2 Best seller

Lasko 754200 – Best Small Greenhouse Heater


  • Weight: 0.96 ounces
  • 1500 watts
  • Fan-forced ceramic heater
  • Two fan speeds / 11 temperature settings
  • Electric heater
  • Auto shut-off
  • Covers 300 square feet

The Lasko Ceramic Portable Space Heater is ideal for a tiny greenhouse. This space heater is only 9 inches tall, but it forces out the heat. It has 1500 watts of warmth and is the perfect size to put on a table with young seedlings. It has two fan settings, but 11 subtle heating options.

Lasko 754200 -2

This small space heater is only designed for small spaces, not for big greenhouses with tall ceilings. It weighs about one pound and has its own built-in carrying handle. It is incredibly quiet and easy to forget about, so many people use it with an outlet timer.

The space heater does have an automatic shut-off to keep it from overheating. It will turn back on when the space becomes chilly again. The casing has a cool-touch feature so you can move the unit anytime. The heater has a red light that activates when the unit is turned on.

  • Compact and easy to carry
  • Good choice for very small greenhouses
  • Quiet motor
  • Adjustable thermostat
  • Automatic overheating protection
  • Low priced
  • Does not shut off when tipped over
  • Too small for bigger greenhouses

Bio Green Phoenix – Best high-end greenhouse heater


  • Weight: 11 lbs
  • Three heater settings
  • Fan can run with or without heat
  • Steel casing
  • Plugs into an electrical outlet
  • Heats up to 400 square feet

If you are looking for a high-end greenhouse heater, this is it. The Bio Green PHX 2.8 is a two-in-one heater that keeps your seedlings growing strongly. It has three output levels that range between 3400 BTUs to 9500 BTUs for different weather conditions. You can set the thermostat up to 79°F. The fan can operate without heating element turned on.

The Bio Green heater is made of high-quality rust-proof steel. The quiet motor has a built-in fan to circulate heat throughout the greenhouse. The fan can also run without the heater being activated. This heater can be placed on the floor or installed as a ceiling unit. The unit needs a 240-outlet to function properly.

This works best in a greenhouse that is around 400 square feet or less. It can easily run 24-hours per day.

  • Low voltage (120)
  • Compact and maneuverable
  • Made for heavy-duty usage
  • Temperature sensor prevents overheating
  • Quiet motor
  • Frost-detection function
  • No automatic shut-off
  • More expensive than other options

Mr. Heater MH9BX – Best propane radiant greenhouse heater


  • Weight: 9 lbs
  • Runs on propane (min 1lb tank)
  • Run time: 3-6 hours
  • 4000-9000 BTU
  • Shut-off safety features
  • Easy to light the pilot
  • Heats up to 400 square feet
  • Four-position controls
  • Piezo ignition

Mr. Heater Buddy gives off between 4000 to 9000 BTUs of radiant heat. It uses clean-burning propane so it is safe to have both outside and inside, though the proper space ventilation must be provided as the heater burns oxygen. The efficient unit is ideal for a greenhouse around 400 square feet.

Mr. Heater F232000 MH9BX Buddy -1

The greenhouse heater has several auto shut-off safety features. It turns off if it is tipped or if the pilot light burns out. It also turns off if oxygen levels are low, so it is ideal for greenhouses that are below 7000 feet above sea level. The heater also has wire protectors to keep small fingers and animals from touching the heating unit. The wires keep cool and protect the radiant ceramic burner.

Buddy is made of steel, plastic, and nickel. It has a fold-down handle and propane connector that swivels. It will run for three hours on one tank. However, the unit does not come with a propane tank.

  • Pilot light ignites easily
  • Many safety features
  • Wire protector
  • Lightweight and easy to move
  • Built-in handle
  • Swivel propane connector
  • Could create carbon monoxide issues
  • Gets very hot
  • Requires regular maintenance
  • Will need several propane tanks to heat a greenhouse during winter
5 Best value

Fahrenheat FUH54 – Best heater for large greenhouse


  • Heavy-duty industrial-style electric heater
  • Louvres direct heat
  • Comes with ceiling mounts
  • Can be mounted vertically or horizontally
  • Temperatures range between 45º to 135º F
  • Auto shut-off and restart

If you have a large greenhouse, the Fahrenheat is the best option. This heater can be mounted to the ceiling of your greenhouse to provide plenty of warmth during the coldest months of the year. The unit can be mounted at a horizontal or vertical angle to heat any space to your standards.

The Fahrenheat looks like and functions like an industrial heater. It has a single-pole thermostat that sets at temperatures that range between 45º to 135º F. To move the heat where you need it, this unit has adjustable louvers.

The greenhouse heater has several safety features. With it mounted to the ceiling, you do not have to worry about small fingers or animals getting into the heating element. It does have an automatic shut-off system that activates when the temperature gets too high. The unit will turn back on once the unit cools to a normal temperature.

The heater weighs 24 pounds and measures about one-foot square. It is small and quiet. To get the most out of the unit, it should be professionally installed by an electrician or HVAC technician. It will efficiently heat a 500-square foot space.

  • Heats a larger greenhouse than other models on the list
  • Includes ceiling mounts
  • Quiet motor
  • Small size fits conveniently in tight spaces
  • Automatic shut-off when overheats
  • Needs to be professionally installed
  • Small
  • Fan can come loose
  • Needs regular maintenance

Comfort Glow EUH341 – Best safety features in a small greenhouse heater


  • Weight: 5.8 lbs
  • Forced-air heater with a built-in fan
  • Cool fan
  • 1300 – 1500 Watts / 5200 BTU
  • Shuts off when tipped
  • Metal casing with tip guards
  • Built-in handle

The Comfort Glow heater pumps out 5200-BTUs of heat for your small greenhouse. The unit weighs less than six pounds and has three built-in handles for easy carrying. It is 15-inches tall, so it can be placed on the floor or on a table to keep your delicate plants warm in the frigid winter months.

This small heater uses 120-volts of electricity while the 1500-watts of energy expels. It has a small fan that directs heat out of a fixed set of louvers. The casing is made of metal and has tip guards to keep the metal from touching other surfaces.

This milkhouse-style heater uses forced electric heat. It has dual power settings and an indicator light that turns on when the unit is running. The safety features include an automatic shut-off system that activates if the unit is knocked over. It also has an automatic shut off when the unit becomes too hot. It also has a built-in thermostat that provides heat between 67 and 87º F.

  • Lightweight
  • Adjustable thermostat
  • Automatic shut-off safety features
  • Visual overheat alarm
  • Can be placed on the floor or a table
  • On-off switch on the front of the unit
  • Louder than other greenhouse fans
  • Feet need to be leveled
  • Doesn’t regularly reach 5200 BTU

Buyplus 01 – Best Innovative Greenhouse Heater


  • Weight: 4.76 lbs
  • Heats up in 3 seconds
  • 750/1500 Watts
  • 90-degree swivel
  • Uses PTC stones for radiant heat
  • Has a fan-only setting
  • Adjustable thermostat

This Electric Heater is a great choice for greenhouses. The innovative unit uses PTC ceramic heating technology that does not need a flame or produce hot, red lights. The heater has three settings: low, high, and fan only. It provides up to 1500 watts of heat for 400-square foot space.

Your plants will stay cozy and warm with the heat from the Buyplus Heater. This small heater weighs under five pounds and its six-foot power cord lets you move it around with ease. The heater swivels up and down 90 degrees. It heats up in three seconds and will heat up to 149°F before the auto shut-off mechanism activates. The heater cools down as quickly as it heats up.

The heater is one of the quietest on the market and it has a power indicator light so you always know when it’s running. The casing is made of fire-retardant metal.

  • Quiet unit
  • Three settings
  • Uses a regular household outlet
  • Auto shut-off safety features
  • Made of fire-retardant metal
  • Cools quickly
  • Heats up to 149°F before shutting off
  • Might need more than one to heat a spacious greenhouse

Homeleader – Best Radiant Greenhouse Heater


  • Weight: 5.5 lbs
  • Radiant wires
  • Metal casing
  • Two settings 1200-watt and 1500-watt
  • Electric power
  • Safety shut-off features

The Homeleader Radiant Heater provides heat very quickly. When your plants need to be warmed up, this little unit does the job. The unit weighs less than six pounds, so it is easy to place on a table top or move to a convenient spot on the floor.

The radiant heat comes from wires. They are protected by a security fence, and they have an oversized fan that sends the heat out into the greenhouse. The fan does not run by itself, it only works when the heating element is activated.

This heater has 1500 watts of heat at the highest setting. It has a high and low setting, and an adjustable thermostat so you don’t have to worry about your plants being overheated. The casing is made of metal and it stands on plastic feet. It does have auto-shut off if it overheats or gets knocked over.

  • Quiet
  • Uses a regular household outlet
  • Auto shut-off safety features
  • Heats quickly
  • Effectively heats about 500 square feet
  • Convenient control panel
  • Only has two settings
  • No fan-only setting
  • Might need more than one to heat a spacious greenhouse

ISILER – Best Affordable Greenhouse Space Heater


  • Weight: 4.3 lbs
  • Ceramic heating element
  • Metal casing with a handle
  • Two settings 1200-watt and 1500-watt
  • 41 °F – 95 °F
  • Electric power
  • Safety shut-off features

The Isiler 1500-watt space heater warms up in two seconds. It has a ceramic heating element and a big grate that spreads heat all over your greenhouse. It is perfect for a small greenhouse that measures under 108 square feet.

The heater has a temperature range between 41 °F – 95 °F, which is ideal for a greenhouse. It heats up to the desired temperature quickly, then you can adjust the setting when your greenhouse reaches the minimum temperature your plants need. This lets you keep your energy costs low.

The space heater is made of a flame-resistant metal case. It does not have any flames or hot red wires, making it safe for young children and animals. It will shut off automatically when the internal temperature reaches 176°F. It will also shut off if it tips. The fan can run without the heating elements.

Even though your plants won’t care about the noise, the heater is very quiet. It also does not have a power light. The electric cord is 4.9 feet. It has a handle on the top of the unit and a support stand to keep the heating elements off the ground. The heater weighs less than five pounds and its longest side is seven inches.

  • Quiet
  • Uses a regular household outlet
  • Auto shut-off safety features
  • Heats in two seconds
  • Effectively heats about 110 square feet
  • Fan can run on its own
  • Lightweight
  • Fan runs the whole time the heating element is on
  • Very small
  • Might need more than one to heat a spacious greenhouse
  • Metal casing gets hot
10 Best price

VIVOSUN – Best Greenhouse Heating Mat


  • Heating mat
  • Uses 6.5 watts
  • Water-resistant materials
  • Sets temperature 10 to 20°F above ambient temperature
  • Available in different sizes
  • Recommended to be used with Thermostat Controller

If you are looking to start seeds in your greenhouse during the cold season, the Vivosun heat mat is a low-cost option that does the job well. This heating element does not use a fan to deliver heat around the greenhouse. Instead, it sits under your sprouts or wraps around a jar to provide heat only where it is needed.

The mat measures 3” x 20” and weighs under one pound, so it can easily sit under a tray of sprouts. It is made of water-resistant IPX-4 makes it easy to clean up any spills. The mat is extremely energy efficient, using only 6.5 watts to keep your seedlings warm in all temperatures.

With the Vivosun heat mat, you don’t need a big greenhouse space to grow your plants. Put the mat under your tray of seedlings and cover it with a humidity dome. You’ll have your own miniature greenhouse in moments. The mat is gentle enough to use without worrying about roots being scorched.

  • Quiet
  • Uses a regular household outlet
  • Will not scorch seedlings
  • Heats quickly
  • Sits under a tray of seedlings
  • Easy to clean
  • Need one for each tray of seedlings
  • Needs temperature control unit and humidity dome

Buyer’s Guide

When picking a greenhouse heater, you should consider several features. It is important to consider what the typical temperatures are in your area and how much space you need to heat. You should also consider how often you need to use the heater and how much you want to spend on your energy bills.

It is also important to consider whether or not you will have children or animals near the unit. Safety features need to be factored in if you know someone can the heater. Otherwise, if it is only sharing space with plants, then safety features and cool-touch systems are not as important. You will also need to consider the portability of the unit. If you have to heat a large greenhouse, then you might need to buy several units, so price might factor into your choice, too.

If you live in a cold part of the world, your greenhouse plants need a heater to keep them from dying in a pile of mush. Yes, there are some plants that are hardy and can withstand a hard frost, but most cannot. Many plants need to be in an environment that is a few degrees above freezing, so your greenhouse heater most likely will not need to warm your space much over 45°F.

A large, industrial greenhouse will have an elaborate system to keep plants warm, but in a smaller one, a space heater often does the trick. You will need to consider the space, who spends time in it, and how cold your winters can be.

10 Best Greenhouse Heaters

BTUs and Space

Greenhouse heaters have their power listed in BTUs or watts. Understanding these terms will help you decide which heater will work best for your space. Watts are used to define a unit of heat power that can come from a radiator. A BTU is used to define the heat energy from a radiator. BTU stands for British Thermal Unit and is the older of the two terms. Watt is used in the International System of Units.

Watts measure power, while BTUs measure energy. These are different things and cannot be easily converted unless you look at BTUs to watts. A BTU per hour converts to 293 watts. So, a radiator that supplies 10,000 BTUs per hour turns to 2,930 watts.

Understanding these numbers helps us understand what size heater will best work in any room. To heat an 8x8x9 room to 45°F, a heater with about 6000 BTUs or 1800 watts is needed. This size room has 576 cubic feet. Anything smaller than that and the room will be difficult to heat. Most of these greenhouse heaters are small, so a larger greenhouse will need more than one heater to raise the temperature to a safe level for young plants.

Heating and cooling professionals use a formula to determine how many BTUs are needed to heat a space. The formula is cubic feet x 0.133 x desired temperature rise. To figure the temperature rise, subtract the outside temperature from the desired inside temperature. If you want to figure out how many watts you need, plan on 10 watts for every square foot of your greenhouse. So, a 1500-watt heater will warm a 150 square foot greenhouse.

Different Types of Heaters

Greenhouse heaters are available with different types of heat, conduction, convection, and radiant. Most of the greenhouse heaters on this list are radiant or infrared heat. These work by transferring heat from a high-temperature ceramic tile to a cool object in the greenhouse. Conduction heat moves thermal energy from one object to another. Convection heats by moving thermal energy through the air.

Greenhouses can be heated by tubes, radiant heat, forced-air, mats, and electric heaters. They all have different advantages and disadvantages. Large greenhouses are often heated by radiant heat installed in the floor. It is expensive to install, but inexpensive to run. In-floor heating uses tubes that direct hot water through the greenhouse and radiant heat rises to warm the plants.

In a small greenhouse, radiant heaters will take care of a particular spot. Some people will place them above doors or near objects that need to be heated. There are several radiant heaters on this list including the Dr. Heater and the Lasko Ceramic Heater. The infrared heaters transfer heat to plants.

10 Best Greenhouse Heaters -2

Modern homes usually use forced air heaters. A burner is ignited when the temperature hits a certain level. Then, a fan blows the air through ducts around the home. Greenhouse heaters do this on a smaller level. The heater warms up and a fan blows the hot air around the greenhouse, but without the ductwork.

Forced air heaters will uniformly heat a greenhouse, but the dry air can damage the plants. It is important to have moisture in the air to let the plants grow properly.

Electric utility heaters send a current through a component. The current generates heat. Fans will force air over the element, then the air moves through the room. Several of the heaters on this list are electric utility heaters, like the Homeleader, which uses wires to conduct energy and create heat. Electric utility heaters are usually portable and lightweight.

Only one heater on our list uses propane. The heater requires a separate tank to be connected to a swiveling gas line. The propane provides a few hours of power. This type of heater does not require a connection to electricity, so it can run when the power is out or if an electrical outlet is not available. The Mr. Heater Buddy on our list uses a small propane tank, so it needs to be replaced after a few hours.

Safety Features

A greenhouse heater should have some safety features. Accidents happen and if heaters do not have safety features, they can become fire hazards. Many greenhouse heaters will have casings that are cool to the touch. Some have handles that stay cool, too.

Another common safety feature is an automatic shutoff system. Most greenhouse heaters will shut off if the internal temperature reaches the predetermined amount. Many have a shutoff system that activates if the heater is tipped.

Greenhouse heaters also have protective elements over the heating unit. Some have louvers that will direct the heat. Others have wires that keep fingers from being able to touch the heating element.

10 Best Greenhouse Heaters -3

Noise Level

Since greenhouses are populated by plants, and plants don’t have ears, noise isn’t much of an issue. But, the greenhouse heaters on this list are relatively quiet. Most have some noise, but the noise is usually caused by a fan. The loudest fan on our list has a decibel rating of 50, which is the equivalent of background noise in a house without a TV or radio being on.

Temperature Adjustments

Many greenhouse heaters have adjustable thermostats. You might not be able to set the exact temperature, but you can set a dial within a range from low to high. Some greenhouse heaters also have a high or low power setting. Others only have one power setting, but different heat levels.

In cold weather climates, greenhouse owners appreciate having heaters with different temperatures and power options. In some parts of the country, winter temperatures can vary widely. Being able to crank up the heat when the temperatures dip below zero, they will help keep plants from dying. And, when the temperature is hovering around freezing, the heater doesn’t have to work as hard. With temperature and power choices, you can keep your electricity usage at a minimum.

Where to Place a Greenhouse Heater

It is important to put a greenhouse heater in a safe space. All of the heaters on this list with the exception of the Vivosun mat should be placed at least three feet from any objects, and even farther from objects that are potentially flammable. You should never put a space heater near stacks of paper or flammable liquids. You should never put a heater close to curtains or blinds because they could be pulled in through the fan and then start a fire.

If you use a greenhouse heater, you should put it on a timer so it only runs when necessary. You should not use an extension cord, because they can become fire hazards. If your heater becomes damaged, you should have it repaired or dispose of it and buy a new one. Greenhouse heaters should not get wet because the moisture can react with the elements in the unit and start a fire. When you water your plants, turn off the heater. Do not turn it on until you are finished. Always read the manual before you first use the greenhouse heater.


Most greenhouse heaters have limited manufacturer’s warranties. They often last a year and can only be used if the heater is not altered in any way. It is advisable to keep your receipts so you can use the warranty if anything happens to your heater. Read the fine print regarding fire hazards and greenhouse heater placement so you do not void the warranty by accident.

10 Best Greenhouse Heaters -1


There are three main types: convection, radiant, and conductive. They can use electric power or propane.

They slowly build heat as air crosses over a heating element. A fan moves the heat into the room. These are good choices for larger greenhouses.

They use liquid that moves through pipes to create warmth. They do not usually have fans to move the heat, but they heat up a limited space quickly. If you have a small space to heat, these are good choices.

A conductive space heater uses electricity to create heat. Electricity moves through the elements and heat radiates from them. They are usually small and portable. They often have little wires that heat up in the unit.

Because greenhouses do not need to be heated to the same temperatures as homes, a full furnace is not necessary. Usually, a small greenhouse heater is enough to warm a small space to a temperature above freezing. If you have a large greenhouse, you might need to run more than one heater on the most frigid days or nights.

New heaters often smell like they are burning. Sometimes, the smell is due to dust on the heating element. If the smell doesn’t go away, you might not want to run the heater anymore. Otherwise, if the smell goes away after a few uses, it probably won’t come back.

Most small greenhouse heaters only need a three-prong 120-volt outlet. Industrial heaters might need more power, like 220-volts. Some greenhouse heaters do not use electricity at all but use propane to generate heat.

They should have automatic shutoff systems that activate in at least two situations. The first reason it should shutoff is if the temperature reaches a preset high. The other reason for shutoff is if the unit tips.

Because greenhouse heaters can get hot, most have casings made of metal. Some have cool-touch features to keep children and animals safe around them. Some greenhouse heaters have casings that are resistant to water splashes, too. They should all have handles that stay cool to the touch because you might have to move them while they are running.

Homeleader -2


If you live in an area where the temperature drops below freezing, you will need a greenhouse heater. Any plants that you want to grow and survive in the winter will need a source of heat. Even though greenhouses do keep some warmth, they have difficulty staying above freezing when the temperature dips and snow builds upon the ground.

A greenhouse heater only needs to bring the temperature above freezing. You do not need to heat the space like you heat your home. So, a greenhouse heater does not need to be incredibly powerful with thousands of BTUs or watts of power. If you have a large space to heat, you can buy two or more greenhouse heaters instead of installing a large unit.

Of all the greenhouse heaters we reviewed, the best choice is the Dr. Heater. This small greenhouse heater uses safe infrared heat to keep your plants warm. The heater is portable, lightweight, and powerful. It comes with all of the necessary safety features, and it has a manufacturer’s warranty. It is quiet, despite having a fan that sends warm air through the greenhouse. The heater has one power, but several temperature settings. The fan can also run without having the heat-activated.

Dr. Heater has a cool touch metal casing that is splash resistant because it is designed for the rigors of the typical greenhouse. It also has a large handle that makes it easy to lift the unit and move it to the perfect spot in your greenhouse. It pumps out 1500 watts of heat, which will warm a 150 square foot greenhouse. It is affordably priced and requires little-to-no maintenance to keep it running all winter long.

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