Choosing a greenhouse heater is a decision about more than the unit’s purchase price: it affects temperature control, running costs, installation and the safety measures your greenhouse needs. Electric greenhouse heaters suit growers who have a reliable power supply and want straightforward thermostatic control. Gas greenhouse heaters can make sense for larger or less connected spaces that need strong heat, especially where electricity is unavailable or costly to extend. The main tradeoff is convenience and precise control against fuel flexibility and potentially high heat output. The better choice depends on greenhouse size, local energy prices, insulation and how closely you need to maintain a target temperature.
Get garden gear delivered free with Prime
- Fast, free delivery on millions of items
- Prime Video, Amazon Music and more included
- Member-only deals all year
Joanolga Greenhouse Heater with Thermostat, 1500W Electric Outdoor Heater
- ✔ Maximum power: 1500W
- ✔ Modes: 20W fan-only, 750W eco, 1500W high
- ✔ Temperature range: 40°F–108°F (5°C–42°C)
Noarixa Greenhouse Heater with Thermostat, 1500W Outdoor Heaters for Patio
- ✔ Maximum power: 1500W
- ✔ Listed heat output: 5120 BTU
- ✔ Modes: 20W, 750W, 1500W
LHUKSGF Greenhouse Heater with Thermostat, 1500W Patio Heater, Red
- ✔ Maximum power: 1500W
- ✔ Modes: 20W, 750W, 1500W
- ✔ Temperature range: 41°F–108°F (5°C–42°C)
At a Glance
| Criteria | Electric greenhouse heaters | Gas greenhouse heaters | Winner |
|---|---|---|---|
| Heat output and greenhouse size | Available in a range of sizes; match output to heat loss and space | Can provide high heat output for larger spaces; capacity depends on the model and fuel supply | Depends |
| Temperature control | Usually straightforward thermostatic control; electric fan models circulate warm air | Varies by model; check thermostat compatibility and how evenly heat reaches plants | A |
| Installation and infrastructure | Needs a suitable electrical supply and safe placement | Needs an appropriate gas supply or cylinder, safe positioning and ventilation | A |
| Running costs | Depends on electricity tariffs, heater efficiency and hours of use | Depends on fuel price, delivery and how often the heater runs | Depends |
| Power and fuel resilience | Requires electricity; outages stop heating unless backup power is available | Can work without mains electricity if the model is designed for it; cylinders need replenishment | B |
| Safety and air quality | No combustion gases from the heater, but electrical safety and moisture protection matter | Combustion requires ventilation and careful installation; monitor carbon monoxide risk | A |
| Maintenance | Generally low; inspect wiring, controls and fans | Fuel connections, burners and ventilation need regular checks | A |
Joanolga Greenhouse Heater with Thermostat, 1500W Electric Outdoor Heater
The Joanolga earns our top spot because its listed carry handle and adjustable angle address a practical greenhouse problem: warmth is useful only where plants need it. If we reposition a heater between a seedling area, a grow tent and a covered patio, those details make this model more adaptable than the Noarixa and LHUKSGF descriptions, which do not mention an adjustable angle or handle.Its temperature range runs from 40°F to 108°F, with automatic cycling intended to maintain a set point. The three modes are described as 20W fan-only, 750W eco and 1500W high, giving us a circulation option and two heating levels. As with the other picks, the claimed reach of up to 160 square feet depends on the greenhouse and conditions; a drafty or poorly insulated space may demand more heat than this compact unit can maintain.The tradeoff is that the listing gives output in watts rather than a BTU figure, while Noarixa explicitly states 5120 BTU. Its footprint is also larger than the Noarixa’s listed dimensions in two directions. We would choose Joanolga for steerable, movable warmth, but buyers prioritizing the clearest stated heat-output figure may prefer Noarixa.
Pros:
- Carry handle and adjustable angle support repositioning and directional placement.
- Thermostat range spans 40°F to 108°F with automatic cycling described.
- Three modes include fan-only circulation, lower-power warmth and 1500W heating.
- IPX4 water-resistant housing and overheat protection are listed.
Cons:
- No BTU heat-output figure is provided in the supplied specifications.
- At 6.3 × 8.2 × 10.2 inches, it is larger in two dimensions than Noarixa’s listed body.
- The advertised coverage of up to 160 square feet is not a guarantee for every greenhouse.
Best for: Greenhouse growers who want to redirect warmth or move one compact heater between a greenhouse, grow tent and covered patio.
Not ideal for: Buyers who need a stated BTU output for direct comparisons, or growers heating a large, exposed or poorly insulated greenhouse.
Bottom line: Choose the Joanolga when a handle and adjustable angle matter more than having a listed BTU figure.
“Choose the Joanolga when a handle and adjustable angle matter more than having a listed BTU figure.”
Noarixa Greenhouse Heater with Thermostat, 1500W Outdoor Heaters for Patio
The Noarixa is the easiest of these three to compare by its stated heat output: the listing gives 5120 BTU as well as three settings of 20W, 750W and 1500W. That detail helps us understand what the maker claims the unit delivers, while the Joanolga and LHUKSGF specifications list maximum watts without a BTU figure. Its temperature control spans 41°F to 108°F, so the basic greenhouse management proposition is similar across the lineup.It also claims IPX4 splash resistance, overheat protection, quiet operation and suitability for spaces up to 160 square feet. Its listed 8.8 × 12 × 6.5-inch dimensions distinguish it from the more upright Joanolga and LHUKSGF. The lower profile may suit some floor placements, but the listing does not provide a handle or adjustable-angle feature, making it less obviously convenient to move and aim.One point deserves scrutiny: the description calls the 20W setting a power mode but does not clearly identify it as fan-only, unlike Joanolga’s listing. Buyers who specifically want circulation without meaningful heating should confirm how that mode works. Compared with Joanolga, Noarixa offers a clearer output figure; compared with LHUKSGF, it supplies more specific dimensions and a stated BTU capacity. It is our pick for specification clarity on output, not for placement versatility.
Pros:
- Lists a 5120 BTU output figure alongside the 1500W maximum.
- Offers 20W, 750W and 1500W settings for different operating needs.
- Thermostat range is specified from 41°F to 108°F.
- IPX4 splash resistance and overheat protection are listed.
Cons:
- The 20W mode is not explicitly identified as fan-only in the supplied description.
- No carry handle or adjustable angle is mentioned.
- Claimed coverage up to 160 square feet depends on greenhouse conditions.
Best for: Buyers comparing compact heaters by a stated BTU figure and three selectable power levels for a small greenhouse or grow tent.
Not ideal for: Growers who need a clearly documented fan-only mode, an adjustable aiming angle or a handle for frequent moves.
Bottom line: Pick Noarixa when its stated BTU figure helps you compare output, and verify the 20W mode if fan-only circulation matters.
“Pick Noarixa when its stated BTU figure helps you compare output, and verify the 20W mode if fan-only circulation matters.”
LHUKSGF Greenhouse Heater with Thermostat, 1500W Patio Heater, Red
The LHUKSGF covers the core needs without a standout placement feature: its product details list a digital thermostat, three power modes, IPX4 splash resistance and overheat protection. For growers who want a compact heater with familiar controls, that makes it a credible alternative to the Noarixa and Joanolga. The temperature range is specified as 41°F to 108°F, and its 20W, 750W and 1500W levels let us choose between low-output operation and stronger heating.Its stated 1500W maximum and claimed coverage of up to 160 square feet put it in the same general category as the other two. The supplied information describes PTC ceramic forced-air heating and says the unit is suited to greenhouses, grow tents and covered patios. Like Noarixa, it does not explicitly identify the 20W mode as fan-only in the provided description. Like both alternatives, it should be treated as a small-space heater whose actual effect depends on insulation, outdoor conditions and airflow.The listed dimensions—6.4 × 8.2 × 11 inches—make it slightly taller than Joanolga and more upright than Noarixa’s listed footprint. That shape may fit a particular floor location, but no handle or adjustable-angle feature is specified. We rank it third because its core heating and safety claims largely overlap with the others, while the supplied details offer fewer distinct reasons to choose it over Joanolga’s flexible placement or Noarixa’s stated BTU output.
Pros:
- Thermostat range is specified from 41°F to 108°F.
- Three settings offer 20W, 750W and 1500W operation.
- IPX4 splash resistance and overheat protection are listed.
- Compact, floor-mounted format is described for greenhouses and grow tents.
Cons:
- No BTU output figure appears in the supplied specifications.
- The 20W setting is not clearly described as fan-only.
- No handle or adjustable-angle feature is mentioned, unlike Joanolga’s listing.
Best for: Growers who want a basic thermostat-controlled 1500W heater with selectable modes and splash-resistant housing for a compact growing area.
Not ideal for: Buyers seeking a documented adjustable angle, carry handle, or a stated BTU figure for output comparisons.
Bottom line: Choose LHUKSGF when its simple thermostat and mode selection fit your setup, while recognizing that the other two have clearer differentiators.
“Choose LHUKSGF when its simple thermostat and mode selection fit your setup, while recognizing that the other two have clearer differentiators.”
As an Amazon Associate we earn from qualifying purchases.
Key Differences
Electric heaters generally make temperature management easier. Many models pair with a thermostat, and there are no combustion products to vent from the heater itself. That suits small and medium greenhouses where a dependable electrical connection is already available. The practical limit is the supply: a heater must be correctly rated for its circuit and protected from damp conditions, and a power outage means lost heat unless backup power is arranged.
Gas can serve greenhouses where electricity is absent or where a model’s high output is useful, but the fuel supply changes the ownership equation. Cylinders must be stored and replaced safely, or a fixed supply installed; combustion also makes ventilation and installation quality central concerns. Neither fuel is automatically cheaper to run. Compare local tariffs and fuel prices against estimated heat demand, and account for insulation, thermostat use and the coldest nights. A lower purchase price can be outweighed by frequent fuel use or the cost of extending infrastructure.
Detailed Comparison
Heat output and greenhouse size (moderate difference)
Both types come in different capacities, so neither fuel wins on its own. Gas models may offer substantial output for larger spaces, while electric models can adequately heat compact greenhouses. The gap is minor until the greenhouse has high heat loss or a large volume; then available capacity and supply limits matter more than the fuel label. Size the heater for the space and climate, rather than assuming a bigger unit will be economical.
Temperature control (Electric greenhouse heaters wins — moderate)
Electric heaters usually have the edge because thermostatic models are common and simple to operate. Gas models vary: some regulate temperature well, while others offer less precise control or require compatible accessories. This is a moderate advantage for electric in greenhouses with delicate plants or narrow temperature targets, where overshooting wastes fuel and can stress crops.
Installation and infrastructure (Electric greenhouse heaters wins — moderate)
Electric wins for ease when a suitable, protected outlet is already available: installation is often limited to safe positioning and checking the circuit rating. Gas needs a cylinder or fixed fuel connection, plus installation and ventilation appropriate to the unit. That is a moderate difference for a small greenhouse, but it can become a major cost and effort for a site without the needed infrastructure.
Running costs (major difference)
There is no universal winner. Electricity and gas prices vary by location, and actual consumption depends on insulation, outside temperature, thermostat settings and run time. Compare the heater’s consumption with local rates across a typical cold period. The difference can be major over a long winter, so do not treat the purchase price or a fuel’s general reputation as proof of lower operating cost.
Power and fuel resilience (Gas greenhouse heaters wins — moderate)
Gas can win where a suitable heater operates without mains electricity: it may keep running through an outage, provided fuel remains available. Electric heating depends on the grid, while gas cylinders require monitoring and replacement. This advantage is moderate for remote sites with unreliable power, but limited if cylinder delivery is difficult or the gas model also needs electricity for controls or a fan. Check the specific unit’s requirements.
Safety and air quality (Electric greenhouse heaters wins — major)
Electric has the simpler safety profile because it does not burn fuel at the heater. It still needs suitable electrical protection, dry connections and safe clearance from water and combustible materials. Gas requires careful fuel handling, suitable ventilation and attention to combustion hazards, including carbon monoxide. The difference is major for growers seeking the least complicated setup; follow the manufacturer’s instructions and applicable local requirements for either type.
Maintenance (Electric greenhouse heaters wins — minor)
Electric heaters generally need less routine attention, with checks for damaged cables, controls, fan operation and dust. Gas models also need checks of burners, fuel connections and ventilation, with servicing as specified by the manufacturer. Electric has a minor advantage for a small greenhouse where simple upkeep is preferred; the gap grows when gas supply and combustion components require regular professional attention.
Electric greenhouse heaters: Pros and Cons
Pros:
- Simple thermostat-based control is widely available
- No combustion gases produced by the heater
- Often easier to install when a suitable electrical supply exists
- Typically less routine maintenance
Cons:
- Cannot heat during a power outage without backup
- May need circuit upgrades or costly electrical work
- Running cost depends on local electricity prices and heat demand
- Output is constrained by heater capacity and the available electrical supply
Gas greenhouse heaters: Pros and Cons
Pros:
- Can provide strong heat for larger or high-loss spaces
- Some models can operate without mains electricity
- Useful where extending electrical service is impractical
- Can suit sites with accessible, affordable fuel
Cons:
- Requires fuel storage or a fixed gas connection
- Ventilation and combustion safety need close attention
- Fuel delivery or cylinder changes add ongoing work
- Running cost varies with fuel prices and consumption
Who Should Choose What
Choose Electric greenhouse heaters if:
- Your greenhouse is small or medium and already has a suitable protected electrical supply.
- You want straightforward thermostat control for seedlings, overwintering plants or a set temperature range.
- You prefer to avoid fuel storage and combustion ventilation requirements.
Choose Gas greenhouse heaters if:
- Your greenhouse lacks practical mains electricity and the chosen gas model can run independently.
- You need substantial heat output and can provide the right fuel supply, ventilation and safe installation.
- Local gas prices and access make the expected operating cost competitive for your usage.
Skip both if: You cannot provide the required electrical protection or safe gas installation, or neither heater’s running cost fits your budget. Improve insulation and compare suitable low-energy or passive temperature measures first.
Value for Money
Paying more for a heater is worthwhile when it adds a feature that matches the greenhouse: a reliable thermostat, suitable output, safe construction for damp conditions or controls that reduce unnecessary run time. A gas unit’s higher output can justify its price for a large, poorly connected site, but only if fuel and ventilation are practical. For a small greenhouse with power available, an appropriately sized electric heater is often better value because installation and maintenance are simpler. Estimate seasonal energy use before buying; the cheapest unit can become the expensive choice if it runs constantly or cannot hold the needed temperature.
Final Verdict
For most small and medium greenhouse owners with a reliable electrical supply, choose an electric heater with a thermostat and a capacity suited to the space. It offers simpler control, fewer fuel-related tasks and a less demanding safety setup. Choose gas when mains power is unavailable or when a suitable gas model’s output and independence from the grid solve a real problem, and you can manage fuel and ventilation safely. The decisive factor is not whether gas or electricity is generally cheaper: it is the combination of your greenhouse’s heat loss, local energy prices and available infrastructure. If none of those conditions is clear, compare estimated seasonal consumption before purchasing.
Frequently Asked Questions
Are electric or gas greenhouse heaters cheaper to run?
Neither is always cheaper. Calculate expected energy use using the heater’s consumption, your local electricity or gas price, and estimated hours of operation. Insulation and thermostat settings can have as much effect as fuel choice.
Which heater is better for a small greenhouse?
An electric heater is often the more practical fit when a suitable protected outlet is available. A thermostatic model is simple to control, and the small space may not need the high output that makes some gas heaters attractive.
Can a gas greenhouse heater run without electricity?
Some can, but others need electrical power for a fan, ignition or controls. Check the specific model’s requirements before relying on it during an outage.
Do gas greenhouse heaters need ventilation?
Combustion appliances require ventilation appropriate to their design and installation. Follow the manufacturer’s instructions and local rules, and take carbon monoxide risk seriously. Do not use a model in a space or manner the manufacturer prohibits.
How do I choose the right heater size?
Consider greenhouse volume, insulation, glazing, local winter temperatures and the minimum temperature your plants need. Use the heater maker’s sizing guidance or a heat-loss calculation; an undersized heater may fail to hold temperature, while an oversized one can cycle inefficiently.
Fall yard work Picks
Greenworks 60V Cordless Leaf Blower with 2.5 Ah Battery and Charger
As an affiliate, we earn on qualifying purchases.
