Best Greenhouse Heater

10 Best Greenhouse Heater (Get Away From Misconception!)

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Before I start revealing the best greenhouse heater, I have a simple question.

Did you think “Any space heater can maintain a healthy climate inside the greenhouse as they all can raise the room temperature?”

If your answer is Yes… Then it’s high time to come out of this misconception!

All heaters can increase space temperature, but the greenhouse heaters raise it maintaining a balance between “TEMPERATURE, HUMIDITY, LIGHT, and AIRFLOW,” which is similar to mimick the natural environment.

Your fundamental mission is to simulate the “NATURE” so that the plants never feel like they are in an artificial incubator. So the temperature transformation should be swift with accuracy.

In a Hurry? Here’s all the top-notch greenhouse heater at a glance.

Top 10 Best Greenhouse Heater Quick Chart

Name

Speciality

Coverage

Fuel Type

Heat Capacity

 Dr. Heater DR218

Water Splash Proof!

250-300 sqft

Electric

10,230 BTU

 Avenger FDT3IR Dual Fuel

Cheapest Operation

1400+ sqft

Natural Gas/LPG

30,000 BTU

 Bio Green PAL 2.0

Great Thermostat

120 sqft

Electric

5115 BTU

 Mr Heater Duel Fuel

For Big Hydroponic

1000+ sqft

Natural Gas

20,000 BTU

 Buyplus Ceramic Patio

Tiny Greenhouse

100 sqft

Electric

5115 BTU

 Comfort Zone PowerGear

Cheapest

60-100 sqft

Electric

5115 BTU

 Bio Green PHX 2.8/US

Strongest Built

250+ sqft

Electric

9554 BTU

 Dyna Glo WK11C8

Paraffin

500 sqft

Paraffin/Kerosene

20,000 BTU

 Dr. Infrared DR-975

Fully Automated

700 sqft

Electric

25,575 BTU

 Lasko Pro-Ceramic

Utility Greenhouse

60+ sqft

Electric

5115 BTU

Jump to In-Depth Reviews…

Please Keep in Mind,

A wrong greenhouse heater may imbalance the moister level, which will trigger numerous fungal or bacterial diseases in baby plants

To find out the best greenhouse heaters, we’ve tested a ton of items inside genuine greenhouse projects along with interviewing several professional horticulturists and ended up with some fantastic recommendations.

Not only that!!!

What type of greenhouse project do you own among “Aquaponics, Hydroponics, and Aeroponics“? We’ve classified the most suitable greenhouse heaters for each of these setups. 

Also, I’ve answered all the essential questions you would need to know. 

Let’s dive in…


7 Essential Lessons Before You Choose a Heater for Greenhouse.


1. Choose the Perfect Greenhouse Heater Among Electric, Gas, or Paraffin. 

You should look for THREE main features of a greenhouse heater, according to several professional horticulturists. Those are…

  1. It’s able to raise the temperature swiftly and can hold steady.
  2. It distributes the heat mimicking the natural source (Sunlight). 
  3. The moisturizer should not be affected too much during operation.

Electric and gas heaters are widely used in commercial greenhouses, and paraffin heaters are used in few remote farms.

However, all these contain particular pros and cons, and here I’ll explain those briefly.

[In the review portion, I’ve picked the perfect heaters from all these three different fuel sources and have explained them elaborately. ] 

Next Read (If you are interested in High BTU Electric Heaters)

Best Electric Garage Heater 240V

A. Gas Heaters for Greenhouse


Note: As the gas greenhouse heater’s thermostat isn’t being operated electronically, their accuracy level isn’t top-notch like electric heaters. If a temperature range (i.o 73°F – 77°F) is okay for you, then you may go for gas. Otherways, if you require an exact temperature point (i.o 75°F always steady), only an electric greenhouse heater will suit you.


For larger greenhouse projects, gas heaters are the most inexpensive solution based on operational and maintenance costs. Additionally, they do impact too little on the greenhouse moisturizer.

Mainly gas heater has two core variants, which are Radiant Blue Flame

Among these TWO types, a few models could be operated by both Natural gas & Propane (Read 3rd product review Avenger FDT3IR Dual Fuel), but most are specified for either natural gas or Propane, and you can’t do interchange between them.   

Both natural gas and propane greenhouse heaters work by the same exact mechanism, and performance is almost similar, so that you may pick anyone according to NG or LPG availability or price point at your state. 

However, the natural gas expense remains always cheaper than LPG.

Now, let me discuss Radiant and Blue Flame Gas Heaters.

Radiant Heating technology is most preferred for greenhouse as it directly passes the heat energy towards the object as infrared waves, similar to the sun’s heating source. 

Additionally, the radiant heating source doesn’t demand solid insulation, and of course, a greenhouse never remains strongly insulated. 

However, suppose you face the radiant heater towards the plants or tender crops. In that case, the heatwave will directly penetrate the leaf and stems, providing natural comfort, which is too healthy and effective for better harvesting.

Blue Flame heater raises the air temperature on the other hand. Then the air circulation increases the room temperature, which is also great and healthy, but farmers prefer this more for chicks, ducks, and dairy farms instead of planting projects. 

Blue flame greenhouse heater consumes a slightly lower amount of gas than the radiant unit.

One drawback is, both the blue flame and radiant heaters don’t work above 7500+ high altitudes due to the lack of oxygen.


Note: Both of these blue flame and radiant heaters require three cubic ventilation for every 10,000 BTU, and don’t forget to keep the window cracked slightly. 


Finally, are these gas heaters safe or emits fumes?

If you keep them in enough ventilated places, gas heaters are 100% safe and never emit fumes, toxic gasses, and odors. 

These gas heaters only produce CO2 gas, which is the same element we breathe out, and it’s essential for all green plants.

B. Electric Greenhouse Heater

The most significant advantage of electric heaters is their high-temperature accuracy. 

For growing newly incubator-born chicks, nursing tender crops, grafting branches for genetic experiments, and so many sensitive stuff, an electric greenhouse heater can provide the exact weather you demand. 

But for large commercial greenhouses, electric heater operation and wirings installation are costly.

However, modern greenhouse projects are entirely dependent on electric HVAC systems. Cause they could be converted into an advanced, automatically controlled setup so that you’re able to maintain the whole environment (Temperature, Humidity, Air Flow, Light) from a central computer and control panel.

Also, Read (If you need to heat an open space!)

Best Construction Heater for Jobsite

C. Paraffin Greenhouse Heater

Paraffin heaters are mainly the kerosene heater, and you only should want to use them if gas or Electricity isn’t easily accessible to you. 

Some indoor paraffin heaters don’t have any risk factors and are healthy enough to use inside greenhouses. (You may Read the 8th product review Dyna Glo WK11C8)

But, maintaining the temperature is a bit tricky for paraffin heaters, and several times it emits fumes and odors, especially when you don’t use clean fuels or wicks get too old. 

Again, if a warm temperature range remains okay for your plants and you won’t require maintaining the weather with sensitivity, paraffin greenhouse heaters might be an easy solution for you. 

2. Solar Greenhouse Heater, Myth or Reality?

There’s no READY TO USE solar greenhouse heater available in the market. 

Or there aren’t any specific heater’s called Solar Greenhouse Heater, so it’s a myth. Although, on several websites, you may have seen this world “solar greenhouse heater,” and most of them are lying at you!

DON’T BE UPSET, HERE’S THE SOLUTION!

Any electric greenhouse heaters could be run by solar power if you build a solar power plant according to your greenhouse’s power demand.

Electric heaters require 110V-240V to run and consume 1.5W to 10KW Electricity, and you may have multiple heaters to warm your greenhouse.

All you need is some solar panels, an On-Grid Solar inverter, Relays, and essential wirings. Here’s a short clue on how to do it.

Two types of solar panels are available in the market; they are Monocrystalline and Polycrystalline. Both work similarly, but monocrystalline is more efficient.

To learn more, you may read an article on solar Monocrystalline vs. Polycrystalline solar panels.

Each panel can produce 100 Watts of Electricity, and 12V-18V depends on various brands.

Suppose your heater needs 10KW Electricity, so to generate that, you require 100+ pieces of 100 Watt solar panel. For better performance, I would recommend at least 5-10 more pieces than accurate calculation.

Now, to convert 12V into 240V or 110V, you will require an ON GRID inverter, and to shift the power line between Solar and the Electricity swiftly, you will need a relay.

After completing the essential wirings, you are ready to go!!!

Installing a solar greenhouse heater might be expensive, but the daytime energy will be 100% FREE for the next 25 years once you install it.

So, if you want to build a commercial greenhouse project, I would highly recommend you do that.

To learn elaborately about the Steps for ON-Grid Solar System Installationyou may check out this blog. 

3. Perfectly Sizing The Greenhouse Heater (BTUs, Room Size & Geographic Location’s Environment Temperature

You need to think of TWO fundamental matrices while calculating the right BTUs for your required greenhouse heater. 

  • Where is your greenhouse located?
  • How densely the plants are placed inside your greenhouse and the remaining water amount inside it.

Let me show you a data chart of required BTUs based on Greenhouse size, but before that, please keep in mind,

None of the greenhouse heaters will fulfill your expectations until you choose the right BTU according to greenhouse size.

The heating of a greenhouse is slightly different from random indoor spaces because the area never remains nicely insulated, like concrete or wooden rooms. There remains muddy soils, waters, and many green leaves that consume temperature enormously.

Data Chart

Depending on various location’s environment temperatures in America, here’s a required BTU data table for standard Greenhouse Setup.

You may customize this according to your plantation density and the climate.

 Greenhouse Size Upto

Environment 32°F-40°F

Environment 20°F – 30°F

Environment 45F°- 50°F +

 80 Square Feet

5118 BTU/hr

6909 BTU/hr

4350 BTU/hr

120 Square Feet

7500 BTU/hr

10,125 BTU/hr

6375 BTU/hr

 250 Square Feet

10,000 BTU/hr

13500 BTU/hr

8500 BTU/hr

 500 Square Feet

13,000 BTU/hr

17550 BTU/hr

11050 BTU/hr

 750 Square Feet

18,000 BTU/hr

24300 BTU/hr

15300 BTU/hr

 1000 Square Feet

20,000 BTU/hr

27000 BTU/hr

17000 BTU/hr

 1250 Square Feet

25,000 BTU/hr

33750 BTU/hr

21,250 BTU/hr

 1500 Square Feet

30,000 BTU/hr

40,500 BTU/hr

25,500 BTU/hr

 

Here’s a screenshot of the Wintertime American Weather Map so that you can calculate accurately according to your location environment.

America Winter Temperature Map - Heatercamp.com
Before you choose the best greenhouse heater, Ensure your environment temperature looking at this temperature map of America.

However, perfect insulation can boost your greenhouse heater’s performance several times. So, here are some essential tips.

4. Advanced Tips for Greenhouse Insulation

If you own a commercial greenhouse, that’s must be well planned and already has been insulated. 

But, if you’ve built the greenhouse by a DIY project, then here are some simple tips and tricks that might be helpful to you for insulating your greenhouse.

  1. BUBBLE WRAP: Worldwide, it’s the most inexpensive solution for passionate gardeners to insulate their greenhouse. Firstly, get the essential measurement of your greenhouse walls and roofs and collect basic bubble wrap. Finally, mold it from inside using duck tapes, pins, and necessary glues.
  2. FOAMING: It’s a bit expensive but better performer and durable. A thin layer of foam on internal greenhouse walls will act as a jacket inside.
  3. CRYSTAL POLYSTYRENE BOX: Insulating plant tubs using these boxes and wrapping the greenhouse with bubble wrap will boost the performance multiple times.

Or You may go through this video about insulation to boost the greenhouse heater’s performance!

5. How are the Greenhouse Heaters Different than Random Space Heater?

Gas and paraffin greenhouse heaters are almost the same as space heaters.

But, the electric greenhouse heaters are specially built for greenhouses with some exceptional features.

  1. Water Splash Proof IPX4: While watering the plants, you won’t need to worry about the heater that remains standing on the floor. They are splashproof and never will get damaged by a big splash.
  2. Highly Thermal Accuracy: Either by using the integrated thermostat or an additional wall thermostat, you can easily maintain the room temperature with almost 99.99% accuracy. Some plants are too sensitive to temperature; for those crops, this feature is mandatory!
  3. Anywhere Mountability: Electric Greenhouse heater offers the freedom of using angles. You can mount it anywhere, from any angle. No matter if you flip it or twist it. So the heat can be circulated towards the exact points. 

6. Healthy Temperature for Different Greenhouse Projects

90% of Plants are well tolerated to temperature fluctuations, and in general, crops survive better on 60°F to 80°F.

But chicks and cattle cubs require comfortable warmth around 95°F to maintain their sound health.

Here’s the data chart of comfortable weather and relative humidity percentage for harvesting several vegetables in the greenhouse so that you can maintain the greenhouse heater’s temperature with accuracy.

 Plants

Minimum Temperature

Maximum Temperature

Healthy Relative Humidity%

 Tomatoes

55°F

85°F

80%-90%

 Peppers

70°F

80°F

50%-70%

 Eggplant

70°F

85°F

90%-95%

 Cucumbers

75°F

85°F

65%-75%

 Microgreens

68°F

72°F

40%-60%

 Herbs

65°F

75°F

50%-70%

 Beans

50°F

70°F

Depends on Generic

 Strawberries

60°F

80°F

90%-95%

For Farm Houses…..

  Cattle   Comfortable Temperature
 Baby Chicken – 1 Week   95°F
 Baby Chicken – 2 Week   90°F
 Baby Chicken – 3 Week   85°F
 Large Chickem   75°F
 Baby Duck   85°F – 95°F

7. Does Greenhouse Heater Impacts on Humidity?

A greenhouse heater doesn’t impact the humidity but, it affects Relative Humidity.

Humidity is the amount of water vapor that exists in the air. 

However, Relative Humidity is the Percentage of the Moister among the highest Moister Holsability of the air at a particular temperature.

Raising the temperature enhances the air’s capability of consuming moister, so the relative humidity percentage drops with increased temperature.

Top 10 Best Greenhouse Heater Reviews


1. Electric Greenhouse Heater – Dr. Heater DR218

Dr. Heater DR218 Review Greenhouse Heater - Heatercamp
  • Power – 3000 Watt, 240 Volt
  • Coverage- 250~300 Square Feet
  • Capacity – 10,230 BTU/hr
  • Breaker- Not Required.

Dr. Heater DR218 is suitable for almost 80% of passionate gardeners who want to protect plants during chilled seasons by building a temporary greenhouse. Impressively, the unit is IPX4 rated water splash-proof. So, watering the plants nearby the heater won’t be a hassle at all! 

We’ve tested this heater on a 200 square feet (15’x14′) greenhouse while the outside temperature was 41°F, and the result we got was satisfying! Dr. Heater DR218 raised the greenhouse temperature to 77°F within 30 minutes and stayed steady.

If your greenhouse is more extensive, like 250~300 square feet, the heater will take longer to raise the temperature, but the heat will be stable at a constant point once it’s raised.

We’ve enjoyed the mobility while testing it in our lab. The carrying handle is thick and handy, so the unit feels lighter, although it weighs around 14 pounds. 

Holding a gardening bucket in hand, you can effortlessly move the heater, grabbing the handle by another hand.

A fan-forced heater produces sufficient airflow towards the plants mimicking the natural breeze and resist the greenhouse from getting too humid or dry. So, the heater provides very comfortable warmth to the plants, just like spring. 

Essential Facts to Learn

Temperature Accuracy for Greenhouse

We know how necessary is the accurate temperature for greenhouse projects as all plants are sensitive to temperature. 

Dr. Heater DR218 comes with two manual dialers. One for thermostat and another for OFF, High, Low & fan-only mode selection.  

The thermostat dialer setup will hold the greenhouse temperature consistently, but you won’t have any clue about the room temperature until you install a digital thermometer around it. 

While testing, we’ve installed a wall thermometer and configured the manual dialer accordingly. It’s a bit tricky for sure!

Water Splash Resistant…? Let’s test!!!

Dr. Heater DR218 is IPX4 rating water splash-proof. 

To test how effective it is, we sprayed water on it using a garden sprayer!!! Though, we won’t recommend you do the same. 

If the water gets splashed on the heater from the top, that won’t be an issue. But if you sprinkle the water directly through the heating vent, then the coil might be defective. 

To let you know, Dr. Heater DR218 contains a fully enclosed motor with a ball bearing that remains lubricated for a lifetime. Also, the heating elements are tubular and enclosed with stainless steel. So randomly, it won’t get damaged by water splash or dust accumulation.

How does it perform after years?

We’ve interviewed two long-time users of Dr. Heater DR218. 

The first horticulturist is using this unit for three years, and still, the unit is trouble-free. 

But the second passionate gardener we’ve interviewed had left the unit unused for a season on summer, and next winter, he felt trouble on startup. 

He unscrewed the heater and checked all the connections, and found that the overheating thermocouple is misfunctioning. He replaced it, and the unit started working like new.

If you aren’t a handyman like this user, don’t worry at all. Read the repairability part below.

Repairability 

I will give a 9/10 as a repairability score for Dr. Heater DR218.

The main three parts of this greenhouse heater are the Heating coil, fan-motor, and thermostat. 

The fan motor and the thermostat are almost impossible to get defective. The heating coil rarely gets defective if you are too unlucky. 

And all the rest parts, like the thermocouple, internal wiring cables, switches, are available in hardware stores. 

The unit comes with a 1-year limited warranty on parts and components. But if it gets defective after this session, there’s a 99% possibility that you can repair it.


2. Best heater for Large Commercial Greenhouse – Avenger FDT3IR Dual Fuel

Avenger FDT3IR Review Greenhouse Heater  Heatercamp
  • Fuel- Natural Gas/ LPG
  • Coverage- Up to 1400 Square Feet
  • Power – 30,000 BTU/hr

Heavy and Long-term useability, along with the lowest operational cost, should be the key features of a greenhouse heater that we look for using commercial purposes. Additionally, it needs to have extensive area heating coverage and high altitudes useability.

Avenger FDT3IR has fulfilled all our criteria and passed on all the test results in the Heatercamp’s lab. 

Before we begin, we have tested

  1. The durability, which was extreme!
  2. Restless long-time operationality (On high heat setup). 
  3. High Altitude Performance.
  4. Hourly Operational cost by both Propane & Natural Gas.
  5. How well does the ODS sensor Perform?

Finally, we’ve picked this unit to cause the result has surprised us! 

The Avenger FDT3IR is entirely manufactured and assembled in America by super-skilled workers, which is the first reason why it’s a bit expensive! The second reason is, the unit comes with a pre-installed blower fan-motor that all other brands sell separately.

Here’s a piece of excellent information for greenhouse owners, all the single sphere parts are widely available, and the unit is entirely repairable even if it gets wholly damaged.    

Our Brief Test Results

Heat Output

Firstly, the company claims that the Avenger FDT3IR can produce 30,000 BTU by burning natural gas and 28,000 BTU by LPG operation. 

We’ve tested the unit in a 1500 square feet insulated hall room and kept the window open slightly to ensure ventilation. We’ve used natural gas as fuel.

(Outside temperature was 50°F)  

The room temperature was raised to 80°F in less than 20 minutes while the heating setup was on MAX.  

The unit contains 5-levels of heat settings or thermostat configs so that you can maintain the greenhouse temperature. But there’s no official measurement of LEVEL vs. TEMPERATURE, so we’ve tested it to find out.

Here are the test results we got

  • Level 1 – Around 60°F 
  • Level 2– Around 75°F
  • Level 3– Around 90°F
  • Level 4– Around 105°F
  • Level 5– Around 118+°F

Note: We’ve tested using Propane too but, we haven’t seen that much noticeable difference in heat production.

Restless Useability

Connecting the natural gas line, we had left the heater ON in an open yard and set the power at MAX. We observed it for 36 hours restlessly, and the heater never kept a break. (We didn’t connect the blower!)

Nothing unusual happened, except the upper portion’s color became a bit brownish! So, we would suggest you use the built-in blower while using restlessly at your greenhouse.

High Altitude Performance

We’ve tested it on a 7500 feet hill-top house and used Propane as fuel. 

The heater was running smoothly, no issue was detected.

The ODS Safety Sensor

For safety, the unit contains an oxygen depletion sensor to detect CO or excessive CO2 and instantly turn the burner off if it notices something unusual. Of course, we’ve tested it.

Turning the heater ON, we’ve covered the unit with a gigantic steel barrel, and within two minutes, the heater got shut down. (Don’t try it yourself)

Hourly Operational Cost

The unit can be operated by both Natural gas and Propane, but Natural Gas will be cheaper.

Gas rate varies from state to state, but here’s our test result.

While Running on Natural gas = 0.1~0.3 USD per hour

While running on LPG = 0.7~0.9 USD per hour.

The Ultimate Advantage of Greenhouse Owners

You can operate the unit without any electricity! Only you need a AAA battery to ignite the piezo light.

You can mount the unit on a wall or keep it standing on the greenhouse floor. If you want to keep it on the floor, you will need a 90-degree gas connector.

Note:  I would recommend a wall thermometer and an additional blower fan to circulate the heat properly to your greenhouse project.


3. Aquaponic Greenhouse Heater with Thermostat- Bio Green PAL 2.0

Bio Green PAL 2.0 Review Greenhouse Heater Heatercamp
  • Watt- 1500
  • Coverage- 120 Square Feet
  • Heat Capacity- 5118 BTU/hr

In Aquaponic greenhouse projects, fishes and plants grow in the same environment, and fish wastes flow through a water tray, where the plants consume nutrition from. So, a massive amount of water circulates through the system.

Fact is, water is the highest heat consumer among all other materials, so maintaining an accurate temperature will be tricky until you install an intelligent controller to handle it.

The Bio Green PAL 2.0 Greenhouse heater comes with a greenhouse standard temperature controller thermostat setup that can intelligently maintain the temperature between -58F to 210F according to your preference. Sounds Crazy?

Here are more impressive features according to our test result.

  1. Bio Green PAL 2.0 come back with the previous heat setup after a power outage.
  2. It’s water splash-proof with an IPX4 rating.
  3. Comes with a 2-years official warranty. 
  4. Too safe for polyethylene greenhouse.
  5. Covers efficiently 120 square feet greenhouse with standard 10+ feet ceiling height.

Features that Impressed Us

Wide range of temperature settings

The heater itself has an integrated thermostat dialer and a (fan/low/high) setup dialer. But, if you only use the heater independently, you won’t find the exact temperature or maintain it too accurately.

So, the packaging contains an additional digital thermostat that you need to connect in line with the heater. Of course, you need to keep it inside the room or greenhouse to get the reading.

We tested inside an 8′ x 10′ polyethylene greenhouse, and the outside temperature was around 40F. With max heat setup, Bio Green PAL 2.0 had raised the temperature to 60F within 5 minutes and stayed steady holding the temperature. Then we’ve raised the thermostat to 75F, and the temperature gets raised within the next 3.5 minutes. 

The display shows the temperature in both Celsius & Fahrenheit scales, but we’ve tested the accuracy with different wall thermometers, remaining ± (3-5) different from the bio green display.

So, I will highly suggest you use an additional wall thermostat to keep your greenhouse temperature at the exact point.

Power Cable wasn’t that long.

The heater’s cable is around 6 feet long, but the thermostat’s extension cable is about 4 feet.

Splash Proof?

We sprayed on it using a garden sprayer, and if you don’t put water exactly inside it, there won’t be any chance of getting water damage.

The unit is too rigid, as it’s made of stainless steel and contains an enclosed lubricated motor and tubular heating coil covered with steel.

All parts are repairable, so you may use this heater without any worry.


4. Hydroponic greenhouse heater- Mr. Heater MHVFB30NGT Blue Flame

Mr. Heater MHVFB30NGT Greenhouse Heater Review - Heatercamp
  • Fuel- Natural Gas
  • Coverage- 1000+ Square Feet
  • Heat Capacity- 30,000 BTU

Vertical farming, the biggest popular commercial greenhouse project, stands by the hydroponic mechanism where the horticulturist uses nutrition water instead of soil. 

These projects demand a tremendous amount of heat so that the crops can survive in frigid weather, and the heat must need to be inexpensive.

So, Mr. Heater MHVFB30NGT blue flame unit appears to our mind due to its dominant heat production and unbelievably minimal operational cost.

Facts that impressed us

Lowest Operational Cost but Mighty Powerful

We’ve measured the hourly gas consumption rate of Mr. Heater MHVFB30NGT using a natural gas flow meter. The unit consumes around 0.032 to 0.035 MCF fuel per hour which means about 0.12 to 0.14 USD hourly expense.

We’ve installed the unit on a hilltop strawberry farming greenhouse in Arizona, almost 4500 feet above the seashore, and sized about 1200 square feet (40′ x 30′) to test the heating capability. It was early January, and the outside temperature was about 50°F.

The blue flame greenhouse heater was preset to MAX, and it was taking a bit longer to raise the room temperature. Then we noticed the heat climbing towards the ceiling, so we’ve placed a random table fan on the top of the heater for air circulation, and the result was phenomenal! 

Within 25 minutes, the room temperature had risen to 80°F, which even impressed the farm owner!

Note: You can install a blower fan just behind the case, but if you use a table fan instead to circulate the air, that will be more effective! 

Feel the Freedom 

Mr. Heater MHVFB30NGT doesn’t require any electrical connection and can be run independently using natural gas. 

All you need is a AAA battery to activate the piezo ignitor, and the unit contains five different level heat settings that work like a thermostat. Though you can’t maintain an exact temperature as it’s a natural gas unit. But here’s a clue about what temperature the thermostat maintains

Thermal Level 1 -60.8°F

Thermal Level 2 -75.2°F

Thermal Level 3 -89.6°F

Thermal Level 4 -104°F

Thermal Level 5 -118.4°F

Almost Zero Maintainance

We’ve discussed with three long-time users of Mr. Heater MHVFB30NGT, and yet they haven’t faced any issue!

How far we’ve researched it, the ODS sensor may malfunction several times so that the pilot light may not stay ON. In that case, you just need to clean the ODS and Piezo Nozzel, and it will start working fine!


5. Best heater for small greenhouse – Buyplus Patio

BuyPlus Patio Greenhouse Heater Review- Heatercamp
  • Power – 1500 Watt, 110 Volt
  • Coverage- 120 Square Feet
  • Capacity-  5,115 BTU/hr

[A Buyplus Patio User from Texas has written this Review]

“Are you a passionate gardener? Me too!!!

So, I do know how sincerely we need to nurse the baby plants in uncomfortable weather. But, for hobby plant tubs, we never want to invest in building a professional greenhouse.

So the BuyPlus Patio Greenhouse heater has provided me an easy solution, where I only need some piece of polythene sheet to cover all my plants with the simply DIY process.

Then by plugging in the unit in any random power socket, I’m able to leave my plants safely through the entire icy winter! The power cable is 75 inches long (one of the longest to reach my socket), and no breaker is needed.

The exciting part is that the heater’s body diameter is only 6.3 inches, which is very handy, and the airflow direction is vertically twistable. So, I’m able to flow air towards my vertical plants directly.

What made me impressed?

Super Safe PTC

My main concern remains safety while operating such a heater, especially when I need to touch the heater’s surface. Amazingly, Buyplus Patio contains integrated ceramic with heating elements that never allow the surface to be hot at all. Even when the unit remains ON for hours, you’ll be able to grab the surface very comfortably.

Accordingly, the greenhouse heater contains an overheated safety sensor so that I’m able to leave it ON overnight without a worry.

My greenhouse is 8′ x 10′ in dimension, and when the outside temperature remains 40°F, the Buyplus Patio heater allows me to maintain the greenhouse temperature above 70°F.

Ultra Quiet

I’m happy to inform you that the Buyplus Patio heater seems too safe for me to use indoor, even in the bedroom. My toddler never notices the sound while he is sleeping.

Handfree Operation

Buyplus Patio greenhouse heater contains two knobs for the operation. One knob is for turning it ON, fan only, Low & High heat settings. Another knob is the thermostat, where you can preset the room temperature in 10 different levels.

I use an external thermometer to keep my greenhouse temperature accurate.”


6. Cheapest Greenhouse Heater for Gardener – Comfort Zone CZ250 PowerGear

Comfort Zone PowerGear CZ250 Greenhouse Heater - Heatercamp
  • Power – 1500 Watt, 110 Volt
  • Coverage- 120 Square Feet
  • Capacity-  5,115 BTU/hr

In case you don’t want to spend more to protect your plants from chilled nights and your greenhouse size is a bit smaller, around 60-100 square feet, then Comfort Zone CZ250 could be the best cheapest solution.

Do you concern about quality? If I tell you frankly, we’ve tested this tiny greenhouse heater from every single aspect, and it will get 8/10 for heating performance but 6/10 for build quality. But considering the budget vs. Performance & features, I should say it would be beyond your expectation.

The unit stands on an oversized metallic leg made of iron pipe, making it super steady while placing on a flat surface. The carrying handle is made of the same iron pipe and remains covered with a soft-touch sponge for better grip. But the grip will come out if you pull it forcefully. However, you will enjoy the mobility while using it inside your greenhouse.

Some impressive Features

Adjustable Operational Angles

Twisting a screw, you will be able to rotate the heater’s head, ups, and downs vertically. But the joint clamp that holds the heater’s head is plastic-made and fragile. Several users have experienced a broken joint after a few days. 

Heat settings and Thermostat

This tinny greenhouse heater contains two different heat settings, including fan-only mode. Also, you can adjust the thermostat for a comfortable temperature inside the greenhouse. 

The thermostat’s Performance is satisfying, though you will require to install an external thermometer to track the temperature.

The unit contains spiral heating elements to produce heat, which is the only option with a low budget.

Comfort Zone CZ250 contains overheating safety features to avoid any unusual events.

My personal opinion on it?

If I would require a temporary heating solution for my smaller greenhouse, I may prefer it for sure. More than 86% of users are satisfied with this tiny budget-friendly unit. But for heavy uses or permanent projects, you may choose a heavier one.


7. Greenhouse Heater with Advanced Thermostat – Bio Green PHX 2.8/US

Bio Green Phoenix Electric Greenhouse Heater - Heatercamp
  • Power- 2800 Watt, 240V
  • Plug Type – NEMA 6-20P
  • Socket Required – NEMA 6-20R
  • Coverage-  About 250+ Square Feet
  • Capacity-  9554 BTU/hr (Max)
  • Warranty- 2 Years

If you are serious about your greenhouse project and searching for a sturdy, permanent and advanced electric heating solution, then Bio Green PHX 2.8/US is going to be your buddy forever.

We’ve tested it too deeply for a very long time in multiple greenhouse environments, and everything we got was impressive. 

For farming chicken crops, ducks, dairy farms, and every single greenhouse planting project, Bio Green PHX 2.8/US is a masterpiece heating solution. Thinking why?

  1. It maintains the temperature with super accuracy.
  2. In the hectic long time uses we haven’t felt any performance fluctuation or issue. (Tested for 36 Hours!)
  3. Too rigid build quality (entirely with stainless steel), we have used too roughly and never could break it.
  4. It contains the tubular heating element, the most long-lasting type and almost impossible to get damaged.
  5. Also, the motor with ball bearing is enclosed and remains permanently lubricated. 
  6. The power cord is 10 feet long, so it easily reaches any power outlet.

Using Experience, Features, and Advantages

We’ve tested this unit inside a 16′ x 18′ greenhouse in Arizona. The outside temperature was 41°F, and we did preset the thermostat on level 8 & choose a 2800 watt max heat setup. 

It took around 37 minutes to raise the room temperature to 72.6°F and started maintaining the temperature. 

The heating heater was getting turned off/on, automatically maintaining the thermal cycle. (Almost 7-times each hour.) (Almost )

A. 3-Different Heat Setup: 

  • Low – 1000 Watt & 3412 BTU/hr
  • Medium – 1800 Watt & 6149 BTU/hr
  • High – 2800 Watt & 9554 BTU/hr

This wide array of power distributions allows you to adjust the temperature more efficiently through all seasons and in various sizes of greenhouses. 

Additionally, whether you are farming chicks or ducks or cultivating plants, you can distribute the most comfortable temperature for the highest production.

B. Air Circulation for Greenhouse Humidity Management: While we tested Bio Green PHX 2.8/US  in the greenhouse, it felt like a natural breeze throughout the plants. Which was super comfortable, and the humidity level was totally under control.

You can keep the fan always ON with a dedicated switch. This feature will allow you to turn the fan OFF automatically once the temperature gets raised to the desired level. Or, by pressing the button, you may allow the fan to spin while the heating coil will cut by a thermostat.

Note: Bio Green PHX 2.8/US comes back to previous settings after a power outage!

Thermostat Test Result

As there’s no digital thermal display to show the temperature, we’ve tested the room temperature on each point of the dedicated thermostat knob.

Here’s the test result. (Slightly change could occur.)

Level 1- 32°F Level 2- 37.8°F Level 3– 43.6°F

Level 4- 49.4.8°F Level 5- 55.2°F Level 6- 61°F

Level 7- 66.8°F Level 8– 72.6°F      Level 9 – 79°F

Level 10 – Max

 Note: You can even adjust the thermostat between each level. ( i.o any position between levels 5 & 6). Or, for super accuracy, you may integrate a wall thermostat.

You may hang this with Greenhouse Ceiling.

Flipping the unit, you may hand this with the roof, and the operation knobs will remain under the heater in this case. There will be no issue with this setup!


8. Paraffin heater for greenhouse – Dyna Glo WK11C8

Dyna-Glo WK11C8 Greenhouse Heater - Heatercamp
  • Fuel- Paraffin/Kerosene
  • Coverage- 500~750 Square Feet
  • Capacity- 10500 BTU/hr
  • Fuel Tank- 1.1 Gallon
  • Battery – 2pc C batteries Required for ignition
  • Operation Hour- 14 Hours+

What could be the most ethical reason to choose a paraffin greenhouse heater?

A. You may want to cut the utility bill up to 70%.

B. Your greenhouse is in a remote location where paraffin is better accessible than gas or electricity.

Or it might be something else. No matter what, we’ve researched out the best healthy and economical paraffin greenhouse heater, “Dyna Glo WK11C8,” so that you can fill all your needs. 

Firstly, this unit is suitable for about 500~750 square feet large greenhouse. But you would require a three cubic feet ventilation and air circulation for gentle heat distribution.

Secondly, it doesn’t require any electricity to run. But as there is no electronic thermostat and manually you need to adjust the wick, installing a wall thermometer is a must to ensure proper warmth for your plants.

Thirdly, Dyna Glo WK11C8 contains an electric ignitor, and you will require two-piece C batteries for this. Also, you can turn the unit off instantly by pressing the shut-off button. 

Finally, Dyna Glo WK11C8 has a 1.1-gallon fuel tank and can run 14+hours by one refill. It means running a whole day on the max heating setup; you won’t cost more than 5.7 USD or 0.23 cents hourly, so it’s almost inexpensive like a propane unit.

User Experience

We’ve tested the Dyna Glo WK11C8 paraffin greenhouse heater in a 26′ x 30′ mushroom farm in Phonex when the outside temperature was 45F and used K-1 Kerosene as fuel.

We’ve used a utility fan for air circulation, and within 25 minutes, the room temperature has risen to 77F. (In max setup)

Usually, no fumes or smell was noticed, except if the wick remains too low or excessively high.

The surrounding of the paraffin heater remains too hot unless you set up a circulation fan nearby. 

You will require to change the wick once a month to get a clean fume-free burn.

Dyna Glo WK11C8 greenhouse heater weighs around 15 pounds, and the build quality seems too sturdy to us.

Note: One drawback is, in very chilled weather, the ignitor hardly works. So you might require to fire it up manually.


9. Heater for Automated (Computerised) Greenhouse Projects – Dr. Infrared Heater DR-975

Dr. Infrared Heater DR-975 Greenhouse Heater - Heatercamp
  • Power- Power- 7500 Watt, 240V
  • Coverage- About 750-800 Square Feet
  • Capacity- 25,575 BTU/hr
  • Breaker- 50 Amp

Suppose you want to build a fully automated computer-operated greenhouse plant where the temperature, airflow, and humidity will all be maintained from a central control panel. 

In that case, Dr. Infrared Heater DR-975 will perfectly suit your project.

You can use this unit in two different ways. Either you may individually use this heater using a remote control, or you may entirely control it from the wall thermostat as well as from the greenhouse control room.

Behind the unit, you will find an alternator switch to shift between the wall thermostat or the heater’s integrated thermostat. Of course, the heater’s integrated thermostat is super accurate as it’s digitally controlled, and an integrated display shows the room temperature.

Dr. Infrared Heater DR-975 comes with a spiral nichrome heating element which is of super qualities, and the fan motor remains enclosed and lubricated.

Most importantly, the fan provides strong air circulation, as you’ll be able to feel it from 8-10 feet away. Additionally, the louvers are adjustable in 5-different levels so that you may pass the air towards the exact direction inside your greenhouse.

User’s Experience

[ William, from California – Using the same unit for 3 years. Here are his words]

“I’ve been using Dr. Infrared Heater DR-975 for three years for my 25′ x 20′ greenhouse project where I harvest tomatoes. 

Firstly I attempted to use it individually by its integrated thermostat, but the heater got turned on/off too randomly. It seemed to me like the thermostat was misleading. So I’ve installed a wall thermostat that supports 240V & 40 amps as the unit draws around 33 amps on max power. 

Till then, it’s running swiftly, and I’ve faced no problem. I won’t recommend this for more extensive than 500 square feet of spaces; in that case, I would go for gas. Additionally, always keep at least 3 feet of space behind the unit while placing it on the wall or ceiling.”


10. Utility Heater for Greenhouse – Lasko Pro-Ceramic

Lasko Pro-Ceramic Utility Greenhouse Heater - Heatercamp
  • Power- 1500 Watts, 110V
  • Coverage- 60-100 Square Feets
  • Capacity- 5115 BTU/hr

While thinking of occasionally using a utility heater in a tiny greenhouse, Lasko Pro Ceramic comes to my mind at the very first. It’s more than worthwhile, as it’s useful for wherever you want and for any purpose.

Note: This unit looks a bit weird. You may think it blows air too forcefully. But, in reality, it’s precisely similar to most other 1.5KW space heaters. Only the difference is, the unit is too sturdy for heavy using purposes.

Lasko Pro Ceramic greenhouse utility heater weighs around 8 pounds, and it’s mainly for the internal ceramic and heavyweight blower. Additionally, the heating elements are nicely distributed inside the ceramic chamber, which has enhanced its durability in multiple levels.

This unit comes with 3-years limited warranty, and we think, if you aren’t too unfortunate, there’s no possibility of getting it damaged.

Lasko Pro Ceramic Contains two different heat settings with an adjustable thermostat and can quickly warm a 60-70 square feet greenhouse. Besides, the unit is of construction build quality, so if required, you may use it in the garage or anywhere you need.