Choosing a greenhouse heater is a practical tradeoff between how easily you can control heat and how you will supply it. Electric greenhouse heaters usually offer straightforward installation, thermostatic control and a range of compact models. Gas heaters can suit larger or poorly insulated spaces where high heat output matters and the electrical supply is limited, but they require fuel storage or a gas connection and careful ventilation.
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VEVOR Greenhouse Heater, 1500W Electric Space Heater with Thermostat, Fan & High Heat Modes, 25° Adjustable Angle, IPX4 & Overhea…
- ✔ Maximum power: 1500W
- ✔ Voltage: 120V
- ✔ Current: 12.5A
Greenhouse Heater with Thermostat – Auto Power Control, Digital Temperature Display, Fast Heating, Overheat Protection – Electric…
- ✔ Heat output: 1500W
- ✔ Current: 15A
- ✔ Coverage claim: About 120 sq ft
1500W Greenhouse Heater with Thermostat, 2 Pack, Green
- ✔ Package: 2 heaters with digital thermostats and thermohygrometer
- ✔ Power modes: 1500W high / 750W low / 24W fan-only (listing specification)
- ✔ Power supply: 110V AC / 60Hz
The right choice depends on greenhouse size, local energy costs, winter temperatures and the crops you need to protect. Electric is the stronger default for small and medium hobby greenhouses with reliable electricity. Gas may make more sense for a larger structure that needs substantial heat and can safely accommodate the equipment. Neither type is automatically cheaper to run: compare the heater’s output and efficiency with local electricity and fuel prices before buying.
At a Glance
| Criteria | Electric greenhouse heaters | Gas greenhouse heaters | Winner |
|---|---|---|---|
| Installation and setup | Usually plug-in or hardwired; simpler setup, though high-output units may need a dedicated circuit. | Requires a suitable gas connection or stored fuel, proper placement and adherence to ventilation and installation requirements. | A |
| Heat output and greenhouse size | Many sizes available; practical for small and medium spaces, with larger electric models limited by circuit capacity. | Can provide substantial heat for larger spaces without drawing equivalent power from the electrical circuit. | B |
| Temperature control | Often easy to pair with a thermostat for steady, automated temperature management. | Thermostat-compatible models exist, but control and temperature distribution depend on the model and installation. | A |
| Running costs | Depends on electricity rates, heater efficiency, insulation and hours of operation; can be costly during long cold spells. | Depends on fuel prices, appliance efficiency, ventilation needs and heat loss; may be economical where gas is affordable. | Depends |
| Ventilation and safety | No combustion gases at the point of use, but safe placement, electrical protection and moisture-rated equipment still matter. | Combustion requires careful attention to ventilation, clearances and manufacturer instructions; unsuitable setups can create serious hazards. | A |
| Power and fuel reliability | Depends on a reliable electrical supply; outages stop heating unless backup power is available. | Can operate independently of the electrical grid if the gas supply is available, though some models still need electricity. | Depends |
| Maintenance | Generally limited, though fans, thermostats and connections still need inspection. | Burners, fuel lines and ventilation arrangements need appropriate checks and upkeep. | A |
VEVOR Greenhouse Heater, 1500W Electric Space Heater with Thermostat, Fan & High Heat Modes, 25° Adjustable Angle, IPX4 & Overhea…
The VEVOR is our most adaptable single heater in this group. Its 1500W output matches the maximum listed for the other options, while the 25° adjustable angle gives us a practical way to aim airflow toward a particular part of a greenhouse. That makes it a more flexible placement choice than the SmterCon, whose description emphasizes automatic control and coverage rather than an adjustable heater angle.Its IPX4 water resistance is a useful distinction for a damp growing environment, but it should not be read as permission to leave the unit exposed to rain or standing water. The two-heater kit carries an IP21 rating, so VEVOR has the stronger stated water protection of those two. We also get high-heat and fan modes, overheat protection, and a temperature range of 40°F to 108°F. Those controls support seasonal use, though the listing does not provide an exact greenhouse coverage figure or thermostat accuracy.The tradeoff is portability: at 7.1 pounds, this is the heaviest explicitly specified unit, and the weight could become tiresome if we move it often. Buyers seeking the SmterCon’s separate digital display or the kit’s humidity monitoring should look elsewhere. For a grower who wants one robust, aimable heater and values a stated water-resistance rating, VEVOR earns the lead spot.
Pros:
- 1500W high-heat mode paired with a fan-only mode
- 25° adjustable angle helps direct airflow
- IPX4 water-resistance rating and overheat protection
- Temperature range listed from 40°F to 108°F
Cons:
- At 7.1 pounds, it is heavier than many compact placement needs call for
- No specific greenhouse coverage area or thermostat accuracy is provided
- Its IPX4 rating does not make it suitable for direct rain or standing water
Best for: Growers who want one adjustable 1500W heater for a damp greenhouse or grow tent and expect to reposition it occasionally.
Not ideal for: Buyers who need humidity readings, a separate digital thermostat display, a specified coverage area or a lightweight unit to move frequently.
Bottom line: Choose the VEVOR when adjustable airflow and stronger stated water resistance matter more than a digital control display or humidity monitoring.
“Choose the VEVOR when adjustable airflow and stronger stated water resistance matter more than a digital control display or humidity monitoring.”
Greenhouse Heater with Thermostat – Auto Power Control, Digital Temperature Display, Fast Heating, Overheat Protection – Electric…
SmterCon makes the most sense when we want the heater to manage temperature automatically. The included digital thermostat and display are central to its appeal: instead of relying only on the heater’s own settings, we can set a target and let auto power control maintain it. Compared with VEVOR, this package puts more emphasis on temperature management than on directing airflow or its stated IPX4 rating.The listing claims coverage of about 120 square feet, which offers a useful point of reference for a compact greenhouse, grow tent or flower room. We should treat that as a general claim rather than a guarantee, since insulation, drafts, outside temperatures and plant ventilation all affect heating needs. It also includes overheat protection, describes fire-proof construction, and provides an adjustable ventilation function for cooling. The supplied specifications identify a floor-mounted convection heater, but give no IP rating or thermostat accuracy.Its limitation is less about the feature list than the boundary of its stated use: about 120 sq ft may be insufficient for a larger greenhouse, and the fan can be noticeable in a quiet setting. Unlike the two-heater kit, it does not list a separate thermohygrometer or a low-heat mode. We rank it second because its thermostat bundle is focused and convenient, while the VEVOR has a clearer moisture-resistance specification and more explicit airflow adjustment.
Pros:
- Digital temperature display and automatic thermostat control
- 1500W output with a stated coverage claim of about 120 sq ft
- Overheat protection and fire-proof construction described
- Adjustable ventilation function supports cooling use
Cons:
- The stated 120 sq ft coverage may not suit larger or drafty greenhouses
- Fan operation can be noticeable in a quiet space
- No IP water-protection rating or thermostat accuracy is specified
Best for: Growers with a compact, sheltered greenhouse who want a digital setpoint and automatic temperature maintenance.
Not ideal for: Owners of larger greenhouses, quiet indoor growing areas, or exposed sites where a published water-protection rating is important.
Bottom line: Pick SmterCon when a digital thermostat is your priority and the greenhouse is within its stated compact coverage range.
“Pick SmterCon when a digital thermostat is your priority and the greenhouse is within its stated compact coverage range.”
1500W Greenhouse Heater with Thermostat, 2 Pack, Green
This two-heater package stands apart by including more than heat control: we also get a separate thermohygrometer to track temperature and humidity. That extra information can help us judge whether a greenhouse is staying within its intended conditions, while the VEVOR and SmterCon listings focus on heater controls. Its digital thermostat is specified with ±1°F accuracy, and the 40°F–140°F range extends higher than VEVOR’s stated range.Flexibility is another advantage. Each unit offers high, low and fan-only modes, while a 90° rotatable airflow and 190 CFM rating help distribute warm air. Low mode is listed at 750W, so buyers can select a lower heat setting when full output is unnecessary. The kit’s stated noise ceiling is 45 dB, which may matter in a quiet grow room. Although the product title specifies a two-pack, the supplied maximum-power specification says 1500W high and 750W low; buyers should confirm how those figures apply to each unit and their electrical setup.The key compromise is IP21 water protection, which is limited compared with VEVOR’s IPX4 rating and does not suit direct rain exposure. The two units also mean more equipment to place and monitor. This is our pick for growers who value humidity readings and multiple operating modes, but we would skip it for an exposed greenhouse or anyone seeking the simplest single-heater setup.
Pros:
- Package includes two heaters, digital thermostats and a thermohygrometer
- High, low and fan-only modes provide operating flexibility
- Thermostat accuracy specified at ±1°F with 40°F–140°F control range
- 90° airflow rotation and 190 CFM airflow specification
Cons:
- IP21 rating offers limited water protection and is unsuitable for direct rain
- Noise level is listed up to 45 dB
- Supplied maximum-power details do not clearly explain per-unit draw for the two-pack
Best for: Growers who want two heater units, low-heat and fan modes, and a separate temperature and humidity monitor.
Not ideal for: Buyers whose heater may face direct rain, who want a simple single-unit setup, or who need unambiguous per-unit power details.
Bottom line: Choose the two-heater kit for added humidity monitoring and operating modes when the units can stay sheltered from direct water.
“Choose the two-heater kit for added humidity monitoring and operating modes when the units can stay sheltered from direct water.”
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Key Differences
The clearest difference is how each heater gets heat into the greenhouse. Electric models turn electricity into heat at the point of use and are often easier to set up and regulate. Gas models burn fuel, so they can produce strong heat without demanding the same electrical capacity. That can matter in a large greenhouse, but the fuel source brings additional installation and ventilation requirements.
Running cost is a local calculation, not a fixed advantage for either type. A greenhouse loses heat through its covering and gaps, so insulation and the required temperature make a major difference to energy use. Compare the cost per unit of useful heat, and factor in the heater’s rated output and expected operating hours. A cheap heater can still be expensive if it runs constantly in a poorly insulated structure.
For many home growers, electric is the simpler starting point because thermostats and basic installation make temperature management more accessible. Gas earns its place when heat demand is high, electricity is constrained, and the owner can meet the appliance’s fuel, ventilation and safety requirements. If neither supply is dependable or the greenhouse cannot retain heat, reducing heat loss may do more for crop protection than changing heater type.
Detailed Comparison
Installation and setup (Electric greenhouse heaters wins — moderate)
Electric wins; moderate gap. Many electric heaters are ready to connect, while higher-output units may require a dedicated circuit or professional electrical work. Gas setups require a fuel connection or cylinder arrangement and attention to clearances and ventilation. For a small greenhouse, electric generally means fewer setup decisions. A gas unit can still be reasonable where a suitable supply and compliant installation are already in place.
Heat output and greenhouse size (Gas greenhouse heaters wins — moderate)
Gas often wins for high heat demand; moderate gap. Gas heaters can provide substantial output without drawing equivalent power from an electrical circuit. Electric models cover a broad range, but the circuit and available supply can limit the practical size of the heater. For a compact greenhouse, a correctly sized electric unit may be ample. For a large structure in a cold climate, gas may be more practical if the site can support it safely.
Temperature control (Electric greenhouse heaters wins — moderate)
Electric wins; moderate gap. Many electric greenhouse heaters work readily with a thermostat, helping maintain a set temperature and avoid unnecessary heating. Gas models can also have thermostatic control, but capabilities vary, and heat distribution depends on the appliance and greenhouse layout. This difference matters most for growers protecting temperature-sensitive plants or managing several heat zones. Check thermostat compatibility and placement before choosing either type.
Running costs (major difference)
Depends; potentially a major difference over a long winter. Electricity or gas can be cheaper per unit of useful heat depending on local tariffs and appliance efficiency. Operating hours, set temperature and insulation often matter as much as the heater type. Estimate heat demand and compare current local energy prices before buying. A lower purchase price does not guarantee lower seasonal cost, and no general rule makes gas or electricity cheaper everywhere.
Ventilation and safety (Electric greenhouse heaters wins — major)
Electric wins for simplicity; major gap in requirements. Electric heaters do not burn fuel at the point of use, though they still need suitable protection from moisture, safe clearance from plants and coverings, and correct electrical installation. Gas combustion requires attention to ventilation and the manufacturer’s safety instructions. Poor ventilation or incorrect use can create serious hazards. Choose gas only when the greenhouse and installation can meet the appliance’s requirements.
Power and fuel reliability (moderate difference)
Depends on the site; moderate gap. An electric heater is convenient where the supply is reliable, but it stops during a power cut unless backup power is available. A gas heater may continue during an outage if it has a dependable fuel supply and does not require electricity for operation. Some models do need electrical power for controls or ignition, so check specifications. The better option is the one whose supply is most dependable at your greenhouse.
Maintenance (Electric greenhouse heaters wins — minor)
Electric usually wins; minor to moderate gap. Electric models generally have fewer combustion-related parts to inspect, though fans, thermostats, wiring and connections still need attention. Gas equipment adds burners and fuel-system components that should receive appropriate checks. This matters more where heaters run for long periods or the owner cannot arrange routine servicing. Follow the specific manufacturer’s maintenance schedule for either type.
Electric greenhouse heaters: Pros and Cons
Pros:
- Often simpler to install and operate.
- Thermostatic control is widely available and straightforward to use.
- No combustion gases produced at the point of use.
- Many compact models suit small and medium greenhouses.
Cons:
- Running costs can be high where electricity is expensive or heating hours are long.
- High-output models may exceed the capacity of an ordinary circuit.
- Heating stops during a power outage without backup.
Gas greenhouse heaters: Pros and Cons
Pros:
- Can deliver substantial heat for a larger greenhouse.
- Can reduce reliance on a high-capacity electrical circuit.
- May keep operating during a power cut if the model and fuel supply allow it.
Cons:
- Needs a suitable gas connection or stored fuel.
- Combustion requires ventilation and careful adherence to safety requirements.
- Setup and ongoing equipment checks can be more involved.
Who Should Choose What
Choose Electric greenhouse heaters if:
- You heat a small or medium hobby greenhouse and want straightforward setup.
- You need dependable thermostat control for seedlings or temperature-sensitive plants.
- Your greenhouse has a reliable electrical supply and local electricity costs are acceptable for the expected use.
Choose Gas greenhouse heaters if:
- You need high heat output for a large greenhouse and electrical capacity is limited.
- Gas is readily available at a competitive cost where you live.
- You can meet ventilation, placement and fuel-system requirements and arrange appropriate checks.
Skip both if: Neither supply is reliable or affordable, or the greenhouse loses heat so quickly that a heater would run continuously. Improve insulation and seal gaps first, then size a heater to the remaining heat demand.
Value for Money
Electric often offers better value for a small greenhouse because the simpler setup and easy thermostat control can save time and help avoid unnecessary heating. That advantage can disappear if electricity is expensive and the heater must run through long, cold nights. Gas may justify its extra installation and upkeep when it supplies the output a large greenhouse needs or avoids costly electrical upgrades. Pay more for gas only when its capacity, local fuel costs or resilience solve a real problem for your site. Before comparing purchase prices, estimate seasonal energy use and check each model’s efficiency, output and control features.
Final Verdict
For most hobby growers with a small or medium greenhouse, choose an electric heater with a compatible thermostat. Its simpler installation and control make it the more practical default, provided the circuit can support it and winter electricity costs fit your budget. Choose gas when a larger greenhouse needs substantial heat, electrical capacity is limited, and you have an appropriate fuel supply and safe installation. The deciding factor is not the label on the heater: it is whether your site can deliver the required heat safely at a cost you can sustain.
Frequently Asked Questions
Are electric or gas greenhouse heaters cheaper to run?
Neither is always cheaper. Compare current local electricity and gas prices with the heaters’ efficiency and expected operating hours. Greenhouse insulation and the temperature you need to maintain can have a large effect on the total bill.
Which type is better for a small greenhouse?
Electric is usually the more practical fit for a small greenhouse because many models are compact and simple to pair with a thermostat. Confirm that the heater is sized for the space and that its electrical requirements suit the circuit.
Can I use a gas heater in an enclosed greenhouse?
Only if the specific heater is approved for the setting and can be installed and operated with the ventilation and clearances required by its manufacturer. Gas combustion needs careful attention to safety; do not assume an enclosed space is suitable.
Will a greenhouse heater protect plants during a power outage?
An electric heater will stop without power unless you have suitable backup. A gas heater may keep running if its fuel supply is available and the model does not depend on electricity for ignition or controls. Check the specifications and plan for the outage risks at your site.
