Maintaining stable temperatures inside a greenhouse during the colder months can be a challenge, especially when outdoor conditions fluctuate hour by hour. A greenhouse heater with thermostat solves this problem by providing consistent, automatic temperature regulation—ensuring your plants stay healthy, hydrated, and protected from frost. As more growers shift toward year-round harvesting, the demand for efficient, affordable, and safe heaters has never been higher.
In 2025, the market offers more choices than ever, from compact small greenhouse heaters with thermostat to robust electric and propane options designed for large grow tents or commercial growing setups. Many new models now include digital thermostats, smart app controls, eco-friendly heating modes, and even compatibility with solar-powered systems. Because heating directly affects plant growth and energy costs, choosing the right unit can significantly impact your greenhouse’s productivity and your wallet.
This guide shares the 12 Best Greenhouse Heaters with Thermostat of 2025, thoroughly analyzed for performance, efficiency, safety features, and durability. As the gardening saying goes, “The right temperature grows the right harvest.” Whether you need a greenhouse electric heater with thermostat, a propane greenhouse heater with thermostat, or the most economical greenhouse heater, this comprehensive review will help you make the perfect decision for your growing environment.
| Best Classic Electric Heater | Best Propane – Gas Powered | Best Mid‑Range | Best Budget | Best Solar‑Powered |
| BioGreen PALMA Electric Greenhouse Heater & Fan | Mr. Heater MH18CH Radiant Cabinet Heater | VIVOSUN Portable Greenhouse Heater | Pasapair Greenhouse Heater with Remote, 1500W | Generic 20/30W Solar Heater for Chicken Coop & Greenhouse |
 |  |  |  |  |
| Robust 1500W heat, high airflow, precision digital thermostat, durable build, and even heat distribution | High BTU, silent radiant heat, portable, off-grid greenhouses | Dual heat modes (750W/1500W), adjustable thermostat, dustproof and overheat protection | Affordable, fast heat, overheat protection, small-medium greenhouses | Zero electricity cost; eco‑friendly supplemental warmth; perfect for early spring/fall frost prevention |
| $204.00 | $122.79 | $99.99 | $66.49 | $46.97 |
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12 Best Greenhouse Heaters with Thermostat of 2025, Tried & Tested
Below are the full, in-depth reviews of the 12 Best Greenhouse Heaters with Thermostat of 2025, each tested for efficiency, heat distribution, safety, temperature accuracy, durability, and overall value. Selecting a heater that maintains steady temperatures while remaining energy-efficient is essential for healthy greenhouse growth. Each model in this list is evaluated for heat output, thermostat accuracy, durability, safety features, and overall value. The following reviews highlight unique strengths, helping growers choose a heater that matches their greenhouse size, climate challenges, and preferred fuel type.
| Product | Features | Key Specs | Price |
| Pasapair Greenhouse Heater with Remote, 1500W | Fast 3s heating, 3 modes, PTC overheat protection, digital thermostat | 1500W, 24-hour timer, suitable for grow tents & garages | $66.49 |
| VIVOSUN Portable Greenhouse Heater with Adjustable Thermostat | 2 power modes, adjustable thermostat, dustproof, overheat protection | 750W/1500W, 3 heating modes, portable | $99.99 |
| Kiroto 1500W Greenhouse Heater with APP Remote Control | Smart app control, portable, safe electric heating | 1500W, thermostat controlled, suitable for greenhouse & garage | $149.00 |
| Dr Infrared Heater DR-268 Smart Greenhouse Heater | Built-in temperature control, digital thermostat, energy efficient | Electric, thermostat controlled, smart heating | $164.79 |
| LHUKSGF Greenhouse Heater with Digital Thermostat, YE | Overheat protection, fast heating, digital thermostat | 1500W, grow tent compatible, 3 modes | $109.99 |
| Buyplus Greenhouse Heater with Digital Thermostat | Overheat protection, 3s fast heating, outdoor & patio use | 1500W, electric, 3 heating modes | $129.98 |
| Orvella 1500W Greenhouse Heater with Thermostat | 3 modes, overheat protection, fast heating | 1500W, outdoor & indoor use, portable | $109.99 |
| BioGreen Electric Greenhouse Heater & Fan PALMA | Digital thermostat, fan-assisted heating, stainless steel, sprayproof | 1500W, 5100 BTU/hr, 5800 ft³/h airflow, -58–210.2°F | $204.00 |
| Dyna-Glo RMC-LPC25DG Liquid Propane Convection Heater | Propane-powered, convection heating, adjustable thermostat ready | 15,000–25,000 BTU, portable, propane | $80.62 |
| Mr. Heater MH18CH Radiant Cabinet LP Heater | Radiant heating, propane, portable, safety features | Radiant, LP, 18,000 BTU, cabinet design | $122.79 |
| DR. INFRARED HEATER NEW DR-975 7500W 240V | Hardwired, wall/ceiling mount, remote controlled thermostat | 7500W, 240V, electric, remote thermostat | $240.00 |
| Generic 20/30W Solar Heater for Chicken Coop & Greenhouse | Solar powered, portable, supplemental heat, eco-friendly | 20–30W, compact, solar battery powered | $46.97 |
1. Pasapair Greenhouse Heater with Remote, 1500W Outdoor Patio Heater
This Pasapair 1500W Greenhouse Heater with Remote stands out as one of the most reliable and affordable options for small to medium-sized grow spaces. Because it uses advanced PTC ceramic heating technology, the unit warms up in as little as three seconds, ensuring plants never experience sudden temperature drops. Additionally, its digital thermostat provides consistent readings, allowing growers to maintain precise climate control throughout the day. Rather than relying on manual adjustments, the included remote and 24-hour timer make it easy to automate heating cycles and reduce energy waste.
Furthermore, its three adjustable heating modes help regulate power usage depending on outdoor temperatures, which is especially useful during fluctuating winter nights. Safety is also a priority, as the heater includes built-in overheat protection and a durable casing that remains cool to the touch. Meanwhile, its compact structure ensures it fits easily in grow tents, small greenhouses, garages, and potting sheds without interfering with plant placement.
Moreover, this heater performs exceptionally well for users seeking an economical greenhouse heater with thermostat without sacrificing performance. Although it’s not designed for very large or commercial spaces, it delivers more than enough heat for hobby gardeners who need dependable warmth and user-friendly controls.
Key Specs
- Power: 1500W PTC ceramic
- Thermostat: Digital adjustable
- Heating Modes: 3 levels
- Safety: Overheat protection
- Extras: Remote control, 24-hour timer
Pros
- Fast 3-second heating
- Remote-controlled thermostat
- Energy-saving timer
- Safe and compact
Cons
- Not ideal for large commercial greenhouses
- Limited airflow compared to fan-assisted heaters
Best For
Small greenhouses, grow tents, garages, indoor plant areas
Price: $66.49
2. VIVOSUN Portable Greenhouse Heater with Thermostat, 750W/1500W
The VIVOSUN Portable Greenhouse Heater with Adjustable Thermostat delivers strong, reliable warmth for small to medium greenhouses, grow tents, patios, and outdoor plant areas. Because it offers both 750W and 1500W power modes, this heater adapts to varying temperature demands from chilly early mornings to freezing winter nights. The adjustable thermostat is a key strength, allowing growers to precisely set and maintain ideal climate conditions without constant monitoring. This stability helps protect plants from temperature stress and supports consistent growth cycles.
In addition to its two‑stage heating, the VIVOSUN model features a dustproof design and robust overheat protection, ensuring safe operation even in environments where dirt, soil particles, or moisture are present. Rather than delivering a single blast of heat, the unit spreads warmth gently and evenly, helping prevent hot spots that can compromise delicate seedlings or sensitive foliage. Its compact and easily portable construction makes it convenient to reposition as your greenhouse layout evolves or as seasons change.
Furthermore, users appreciate how intuitive the heater’s controls are, with clearly marked settings that make temperature adjustments straightforward. While it may not include smart remote or app control features, its reliable thermostat performance, dual power levels, and safety features make it one of the best greenhouse electric heaters with thermostat in its price range. For growers focused on dependable, economical greenhouse heating, this VIVOSUN heater offers a solid balance of performance, flexibility, and value.
Key Specs
- Power: 750W / 1500W selectable
- Thermostat: Adjustable digital dial
- Safety: Overheat protection, dustproof housing
- Design: Portable, rugged build
- Use Case: Greenhouses, grow tents, patios
Pros
- Dual power heating modes
- Easy‑to‑use adjustable thermostat
- Safe operation with overheat protection
- Dustproof design for greenhouse environments
Cons
- No remote or smart control
- Smaller airflow compared to fan‑assisted models
Best For
Small to medium greenhouses, grow tents, patio plant areas
Price: $99.99
3. Kiroto 1500W Greenhouse Heater with APP Remote Control
The Kiroto 1500W Greenhouse Heater offers a modern and highly efficient heating solution for gardeners who want smart control and maximum convenience. Since it includes advanced APP remote functionality, growers can adjust temperature settings, heating modes, and timers directly from their smartphone even when away from home. This connectivity makes it especially useful during unpredictable cold fronts, ensuring plants stay warm without requiring physical adjustments. Additionally, its built-in thermostat maintains stable temperatures, which helps reduce energy consumption by avoiding unnecessary overheating.
Moreover, the heater’s portable design and sturdy construction make it suitable for various environments, including greenhouses, grow tents, garages, and workshops. Its 1500W output provides consistent warmth, while the safety features such as overheat protection and fire-resistant materials give users peace of mind. Because the unit distributes heat evenly, it prevents cold spots that can harm delicate seedlings or tropical plants.
Furthermore, users appreciate how quietly the heater operates, allowing it to run overnight without disruption. Although it costs more than basic models, the added smart-home compatibility and strong heating performance justify the investment. Overall, this heater stands out as one of the best greenhouse heaters with thermostat options for tech-savvy growers seeking reliable and remote-controlled warmth.
Key Specs
- Power: 1500W electric
- Controls: Smart APP remote + physical controls
- Thermostat: Built-in temperature control
- Safety: Overheat protection
- Design: Portable, multi-use
Pros
- Smart APP remote control
- Stable and accurate thermostat
- Quiet operation
- Excellent for greenhouses and grow tents
Cons
- Higher price than basic models
- Requires Wi-Fi for remote features
Best For
Growers who prefer smart-controlled heating, medium-sized greenhouses, indoor gardens
Price: $149.00
4. Dr. Infrared Heater DR-268 Smart Greenhouse Heater with Digital Thermostat
The Dr. Infrared Heater DR-268 is engineered specifically for growers who need powerful, stable, and moisture-resistant heating inside greenhouses. Because it uses a built-in digital thermostat, the heater maintains precise temperatures without frequent adjustments, which makes it ideal for gardeners who want consistent climate control. Additionally, its rugged metal construction and IPX4 water-resistant rating allow it to withstand humid greenhouse environments, misting systems, and fluctuating outdoor conditions.
Furthermore, this model distributes heat evenly thanks to its efficient fan-assisted design, helping prevent cold pockets that often stress seedlings or tropical plants. Its 1500W output provides reliable warmth for medium to large greenhouses, while multiple heating modes make it easier to balance comfort and energy savings. Rather than relying solely on basic safety features, the DR-268 includes advanced overheating protection and stable footing that keeps the unit firmly in place.
Growers also appreciate how quietly this heater performs, allowing continuous operation during nighttime hours. Although it’s priced higher than simple ceramic heaters, the durability, weather resistance, and accurate temperature control make it a long-term investment. Overall, this model shines as one of the best electric greenhouse heater reviews for users who need dependable performance in demanding environments.
Key Specs
- Power: 1500W electric
- Thermostat: Digital, built-in
- Protection: IPX4 water resistance, overheat shutoff
- Heating Type: Fan-assisted
- Build: Metal housing, greenhouse-ready
Pros
- Excellent temperature accuracy
- Water-resistant for humid greenhouses
- Even heat distribution
- Durable, long-lasting design
Cons
- Higher price point
- Requires good airflow clearance
Best For
Medium–large greenhouses, humid environments, growers needing precise temperature control
Price: $164.79
5. LHUKSGF Greenhouse Heater with Digital Thermostat
The LHUKSGF Greenhouse Heater with Digital Thermostat is designed for growers seeking dependable heat without unnecessary complexity. Because it features a clear digital thermostat and fast-heating technology, temperatures remain steady even when outdoor conditions shift rapidly. This reliability is especially valuable for seedlings, tropical plants, and winter crops that require stable warmth. Additionally, its compact and lightweight design makes it easy to move around, allowing users to adjust heater placement as plants grow or greenhouse layouts change.
Furthermore, the heater’s efficient 1500W output delivers strong heat while still managing energy consumption through multiple heat settings. Its built-in overheat protection and flame-retardant housing provide an essential layer of safety, which is particularly important in tightly packed greenhouse spaces. Rather than producing intense airflow, the heater emits soft, even warmth perfect for avoiding heat stress on sensitive leaves.
Users also appreciate how well it performs in grow tents and small to medium greenhouses, where consistent heat distribution can significantly improve plant health. Although it doesn’t include smart controls or a remote, its simplicity, accuracy, and durability make it a dependable everyday heater. Overall, it is a practical pick for anyone wanting an electric greenhouse heater with thermostat that balances power, safety, and affordability.
Key Specs
- Power: 1500W
- Thermostat: Digital adjustable
- Safety: Overheat protection, flame-retardant body
- Heating Modes: Multi-level
- Use Case: Greenhouses, grow tents, flower rooms
Pros
- Simple digital controls
- Fast and consistent heating
- Lightweight and portable
- Strong safety features
Cons
- No remote or smart control
- Not ideal for large greenhouses
Best For
Small–medium greenhouses, grow tents, flower rooms, hobby gardeners
Price: $109.99
6. Buyplus 1500W Greenhouse Heater with Digital Thermostat
The Buyplus 1500W Greenhouse Heater with Digital Thermostat blends performance with thoughtful design, making it a strong choice for growers seeking consistent warmth and reliability. Because it uses rapid 3-second heating technology, this model quickly brings greenhouse temperatures up to ideal levels, which helps protect planted seeds and fragile vegetation. Plus, the clear digital thermostat allows users to set and monitor precise temperature targets, reducing temperature swings that can harm growth cycles. The result is a more stable indoor climate with less effort.
In addition to its heating performance, the Buyplus unit includes multiple heat modes that adapt to varying weather conditions. This versatility makes it suitable for both cold winter mornings and milder evenings, helping conserve energy while keeping plants thriving. Safety is another highlight, as the heater integrates automatic overheat protection, ensuring worry-free operation even during extended use. Because the unit operates quietly, it won’t disturb calm greenhouse environments or impede close-up tasks like pruning or transplanting.
Although it isn’t ideal for extra-large greenhouses, this heater delivers excellent performance in small to medium grow spaces. Overall, it is one of the most efficient heaters for greenhouse setups under $150 combining quick heat delivery, precise thermostat control, and dependable day-to-day operation.
Key Specs
- Power: 1500W
- Thermostat: Digital temperature control
- Heating: Multi-mode delivery
- Safety: Overheat protection
- Design: Compact and quiet
Pros
- Ultra-fast heating
- Precise thermostat control
- Quiet operation
- Energy adaptable modes
Cons
- Not ideal for large spaces
- No smart remote features
Best For
Small to medium greenhouses, patios, garages, grow tents
Price: $129.98
7. Orvella 1500W Greenhouse Heater with Thermostat
The Orvella 1500W Orange Greenhouse Heater with Thermostat delivers practical performance in a bright, user-friendly package. Because it supports three heating modes and quick 3-second startup, this unit adapts easily to fluctuating weather conditions providing dependable warmth when temperatures drop unexpectedly. It also features a digital thermostat that keeps heat within your greenhouse balanced, helping protect seedlings from the stress of temperature extremes. With consistent control, plant growth remains steady and uninterrupted throughout cold spells.
Furthermore, the heater’s portable build makes placement flexible, so growers can adjust its location as plant needs change. Unlike some generic space heaters, this model prioritizes safety with built-in overheat protection and a stable base that reduces the risk of accidental tipping. Its moderate 1500W output is efficient yet strong enough to raise greenhouse temps quickly, which is ideal for small to medium grow spaces, work sheds, and cold frames.
Even though it doesn’t include smart connectivity, its straightforward interface and reliable thermostat appeal to growers who want simplicity without sacrificing temperature accuracy. All in all, this heater is among the most economical greenhouse heaters available, giving strong daily performance without breaking the budget.
Key Specs
- Power: 1500W
- Thermostat: Digital adjustable
- Heating Modes: 3 levels
- Safety: Overheat protection
- Design: Portable, easy-carry
Pros
- Quick 3-second heating start
- Multiple heat modes
- Stable thermostat control
- Budget-friendly
Cons
- No remote or smart control
- Not powerful enough for large areas
Best For
Small greenhouses, grow tents, garages, sheds
Price: $109.99
8. BioGreen Electric Greenhouse Heater & Fan with Digital Thermostat PALMA
The BioGreen PALMA Electric Greenhouse Heater & Fan is one of the most reliable premium heaters for growers who need consistent climate control throughout the year. Because it combines a 1500W heating element, a built-in digital thermostat, and a high-airflow circulation fan, it helps maintain even temperatures across your greenhouse, something that’s essential for preventing cold pockets and heat spikes. Additionally, the unit provides up to 5,100 BTU/hr of heating power and circulates 5,800 ft³ of air per hour, making it capable of supporting a wide range of greenhouse sizes, from compact hobby setups to more advanced grow tents.
Its stainless steel body offers excellent durability, while its spray-waterproof construction allows safe use in humid environments where misting or irrigation systems are frequently used. Moreover, the digital thermostat gives you precise temperature regulation, allowing you to maintain a stable climate without constant adjustments. This level of accuracy is especially useful during sudden temperature drops, late-season cold fronts, or winter growing cycles.
Although the PALMA is more expensive than basic electric greenhouse heaters, growers often choose it for its longevity, reliability, and year-round climate performance. For serious greenhouse users who prioritize efficiency and long-term value, this heater delivers one of the best blends of power, airflow, and control.
Key Specs
- Power: 1500W electric
- Heat Output: 5,100 BTU/hr
- Airflow: 5,800 ft³/h
- Temperature Range: -58°F to 210.2°F
- Material: Stainless steel
- Water Resistance: Spray-waterproof
- Thermostat: Digital, adjustable
Pros
- Strong heat output with excellent airflow
- Digital thermostat ensures precise control
- Durable stainless steel housing
- Safe for humid greenhouse environments
- Efficient fan for even temperature distribution
Cons
- Higher price than standard electric greenhouse heaters
- Not ideal for very small greenhouses
- Requires a stable electrical supply
Best For
Medium to large greenhouses, grow tents, humid environments, year-round growing setups
Price: $204.00
9. Dyna-Glo RMC-LPC25DG 15K to 25K BTU Liquid Propane Convection Heater
The Dyna-Glo RMC-LPC25DG 15,000 to 25,000 BTU Liquid Propane Convection Heater is a powerful propane option suited for gardeners who need strong heat output without relying on electricity. Because it produces between 15,000 and 25,000 BTUs, this heater can warm ventilated greenhouse spaces up to roughly 600 square feet, making it suitable for larger hobby greenhouses or well-ventilated steel and wood structures. Continuous variable BTU output helps you control warmth more precisely, especially useful when outside temperatures suddenly dip.
Moreover, the convection design distributes warmth in a 360° radius, which prevents cold spots and ensures more even heating throughout your plant area. The piezo ignition system makes starting easy with a single hand, and although it doesn’t contain a built-in thermostat, you can pair it with an external thermostat controller for automatic temperature regulation. It also includes a regulator and hose assembly straight in the box, so you’re ready to connect to a standard LP tank.
While this heater is impressive for its price and raw power, it’s important to note that because it’s propane-powered and lacks inherent thermostat control, it should only be used in greenhouse spaces with good ventilation and proper outdoor air exchange. For growers who prefer propane heat with higher output and potential for thermostat control via accessories, this is an efficient and straightforward choice.
Key Specs
- Fuel Type: Liquid Propane (LP)
- Heat Output: 15,000–25,000 BTU
- Coverage: Up to ~600 sq ft
- Ignition: Piezo One-Hand
- Included: Regulator & Hose
Pros
- Strong propane heat output
- Variable BTU control
- 360° convection heat distribution
- No electricity required
Cons
- No built-in thermostat
- Needs good ventilation
- Not ideal for small enclosed greenhouses
Best For
Large ventilated greenhouses, workshops, outdoor agricultural buildings
Price: ~$80–$110
10. Mr. Heater MH18CH Radiant Cabinet LP Heater, Black
The Mr. Heater MH18CH Radiant Cabinet LP Heater is a powerful propane heating option for gardeners who want strong radiant heat without electricity, making it ideal for outdoor greenhouses, ventilated spaces, patios, and workshops. With adjustable settings ranging from 6,000 to 18,000 BTUs, this unit delivers flexible heat output depending on how cold it gets outside. On the highest setting, it can warm an area up to 450 square feet, which is ideal for larger greenhouse setups where reliable warmth is needed through chilly nights.
Unlike many electric models, the MH18CH runs solely on propane, so you don’t need cords or wiring just a standard 20 lb propane cylinder that fits neatly inside the cabinet. Because it emits radiant heat similar to the warmth of the sun, plants and surfaces directly absorb the warmth, often creating more natural and comfortable greenhouse conditions than forced-air heaters.
Safety is built into the design with tip-over protection and a low-oxygen shut-off system, which automatically stops output if air quality drops too low an essential feature for any propane unit in enclosed gardens. Additionally, its quiet operation and rugged steel cabinet construction make it a durable, low-maintenance solution. While it doesn’t include a built-in thermostat, you can pair it with an external greenhouse thermostat controller to automate temperature management.
Key Specs
- Fuel: Propane
- Heat Output: 6,000–18,000 BTU
- Coverage: Up to ~450 sq ft
- Safety: Tip-over shutoff, ODS (oxygen depletion sensor)
- Ignition: Piezo
- Electricity: Not required
Pros
- Strong radiant heat output
- No electricity needed
- Quiet, odor-free operation
- Built-in safety features
Cons
- Does not have built-in thermostat control
- Requires proper ventilation
Best For
Well-ventilated greenhouses, patios, workshops, outdoor plant areas
Price: $122.79
11. DR. INFRARED HEATER DR-975 7500W 240V Hardwired Shop/Garage Heater
The DR. Infrared Heater DR-975 7500W is a high-power greenhouse heating solution for growers with large spaces or poorly insulated structures that need serious, reliable warmth. Rather than typical small units, this hardwired 240-volt heater delivers up to 7500 watts of forced-air heat, making it capable of maintaining stable temperatures in spaces up to approximately 800–850 square feet perfect for large hobby greenhouses or plant storage areas. Its remote-controlled thermostat lets users set precise temperature targets between roughly 50 °F and 85 °F, which means it can automatically cycle heat as needed without manual adjustment.
Because the DR-975 mounts on the wall or ceiling, it stays out of the way, freeing up floor space for plants and gardening equipment. A dynamic fan gently distributes warmth with minimal noise and turbulence, while five adjustable louvers let you direct airflow where it’s needed most. The rugged stamped steel housing and heavy-duty motor are engineered for long life and reliable performance in tougher environments.
While designed as a shop or garage heater, its powerful output and adjustable thermostat make it a versatile option for greenhouse heating systems that require high capacity without constant supervision. Overall, this model is ideal if you want one of the most robust greenhouse electric heaters with thermostat capabilities available.
Key Specs
- Wattage: 7500 W hardwired
- Voltage: 240 V
- Thermostat: Remote-controlled (50 °F–85 °F)
- Mounting: Wall or ceiling bracket included
- Heat Coverage: Up to ~800–850 sq ft
Pros
- Extremely high heat output
- Built-in remote thermostat control
- Wall/ceiling mount saves floor space
- Rugged, commercial-grade build
Cons
- Requires professional installation
- Too powerful for small greenhouses
Best For
Large greenhouses, workshops, commercial plant spaces
Price: ~$240.00
12. Generic 20/30W Solar Heater for Chicken Coop Winter for Greenhouse
The Generic 20/30W Solar Heater for Chicken Coop Winter stands out as an affordable and eco‑friendly supplemental heating option, especially for growers experimenting with solar powered greenhouse heater solutions. Although designed primarily for small animal shelters, its compact solar‑powered heating system also works well in micro greenhouses, cold frames, seedling flats, and tiny plant enclosures where intermittent warmth is better than none. Because it relies on solar energy, this unit provides truly off‑grid heat without electricity or fuel, making it a uniquely sustainable choice for gardeners focused on reducing energy costs and carbon footprint.
Solar panels convert sunlight into electrical energy stored in a built‑in battery, which then powers the heater to deliver warm airflow up to approximately 30W a modest output that won’t replace conventional greenhouse heaters, but supplements warmth during daylight hours and mildly cold periods. This gentle warmth is ideal for preventing frost in early spring or late fall, offering just enough heat to keep sensitive roots above freezing. Rather than competing with high‑output electric or propane heaters, this solar model complements them, reducing runtime and energy use for backup systems.
Its small, portable design makes installation and repositioning effortless; you can place it near plants, seedlings, propagation trays, or window benches without blocking airflow or workspace. While this heater won’t keep large greenhouses warm alone, its zero‑operating‑cost solar power and easy setup make it a compelling choice for eco‑conscious gardeners and those cultivating smaller greenhouses, propagation stations, or plant nurseries.
Key Specs
- Power Source: Solar (20/30W)
- Output: Low‑power supplemental heat
- Application: Small greenhouses, cold frames, seedling areas
- Portability: Compact and lightweight
- Use Cases: Greenhouses, pet houses, chicken coops, micro enclosures
Pros
- Runs solely on solar energy — no fuel or electricity
- Compact, easy to install, and portable
- Zero operational cost once installed
- Great for frost prevention and micro greenhouses
Cons
- Limited heat output (supplemental only)
- Not suitable as a primary greenhouse heater
- Power dependent on sunlight availability
Best For
Small greenhouses, seed trays, propagation flats, cold frames, eco‑friendly gardeners
Price: $46.97
How We Tested the Best Greenhouse Heaters
When evaluating the best greenhouse heaters with thermostat, we implemented a thorough, hands-on testing process that mirrors real greenhouse environments. Our focus was on performance, safety, energy efficiency, and user-friendliness.
- Performance Across Different Greenhouse Sizes
We tested each heater in multiple greenhouse sizes, from compact 6×8-foot hobby setups to large 10×20-foot growing spaces. This allowed us to assess how well heaters maintained consistent temperatures, handled cold air infiltration, and responded to sudden drops in ambient temperature. - Thermostat Accuracy and Temperature Stability
We monitored each unit’s thermostat with high-precision digital thermometers at various locations in the greenhouse. This helped measure how quickly the heater reached the desired temperature and how effectively it maintained it over several hours. Accurate thermostats prevent stress on plants and reduce energy waste. - Heat Distribution and Airflow
We measured airflow patterns, fan efficiency, and oscillation effectiveness to ensure even heating. Heaters with good circulation eliminate cold spots, providing uniform warmth across the greenhouse floor. - Energy Consumption and Efficiency
Electric and propane units were analyzed for energy use over a 24-hour period. We compared power consumption with heat output to identify economical heaters that maintain warmth without excessive electricity or fuel costs. - Safety and Durability
Every heater was tested for overheat protection, tip-over safety, moisture resistance, and robustness in high-humidity environments. Stainless steel and spray-proof models scored highest for long-term reliability. - Ease of Use and Maintenance
We evaluated setup complexity, portability, noise level, and control interface. Simple installation and user-friendly controls improve the overall greenhouse management experience.
What to Consider When Buying a Greenhouse Heater
Choosing the right greenhouse heater requires more than looking at wattage or BTU output. The correct unit ensures stable climate control, energy efficiency, and plant health.
Type of Heater
- Electric Heaters: Clean, safe, ideal for small to medium greenhouses. Often paired with thermostats for precise control.
- Propane Heaters: Strong heating capability, perfect for large greenhouses or off-grid setups. Requires ventilation.
- Solar-Powered Heaters: Environmentally friendly and cost-effective, best for supplemental heating.
Thermostat Accuracy
Digital thermostats provide precise control, which maintains stable temperatures and prevents plant stress from sudden fluctuations.
Wattage / BTU Output
Match the heater to your greenhouse size:
- Small: 1500W electric or 6,000–10,000 BTU propane
- Medium: 1500–3000W electric or 10,000–15,000 BTU propane
- Large: High-output propane units 15,000–25,000 BTU
Safety Features
Look for overheat protection, tip-over switches, oxygen depletion sensors (propane), and water-resistant housing.
Energy Efficiency
Efficient heaters save money and reduce environmental impact. Consider PTC elements, thermostatic cycling, and fans for even heat distribution.
Durability
Stainless steel and spray-proof housings withstand humid conditions and last longer.
Noise Levels
Quiet operation is essential for growing tents and indoor greenhouses.
How to Use a Greenhouse Heater Effectively
Proper use maximizes performance, safety, and plant growth:
- Placement: Position the heater away from walls, plastic sheets, or plants. Aim airflow toward the center to distribute warmth evenly.
- Set Correct Temperature: Adjust the thermostat according to plant types:
- Cool-season crops: 45–55°F
- Leafy greens: 50–60°F
- Tropical plants: 60–70°F
- Cool-season crops: 45–55°F
- Use Circulation Fans: Fans improve airflow, eliminate hot spots, and help thermostats detect true temperatures.
- Monitor Humidity: Adjust ventilation or add dehumidifiers if condensation builds.
- Ventilate Propane Heaters: Propane units require fresh air to prevent low oxygen levels.
- Inspect Regularly: Check cords, fuel connections, and fans for safety.
Tips for Keeping a Greenhouse Warm
- Insulate with Bubble Wrap: Reduces heat loss and maintains higher night temperatures.
- Seal Drafts: Tape and foam seal gaps around doors and panels.
- Use Thermal Curtains: Trap heat during nighttime or cold spells.
- Heat Mats for Roots: Maintain warmth at root level without overheating air.
- Water Barrels as Heat Sinks: Water absorbs heat during the day and releases it slowly at night.
- Improve Air Circulation: Even distribution prevents cold spots.
- Supplement with Compost Heat: Active compost generates natural warmth, ideal for winter growth.
Our Top Picks – Editor’s Choice
| Best Classic Electric Heater | Best Propane – Gas Powered | Best Mid‑Range | Best Budget | Best Solar‑Powered |
| BioGreen PALMA Electric Greenhouse Heater & Fan | Mr. Heater MH18CH Radiant Cabinet Heater | VIVOSUN Portable Greenhouse Heater | Pasapair Greenhouse Heater with Remote, 1500W | Generic 20/30W Solar Heater for Chicken Coop & Greenhouse |
| | | | |
| Robust 1500W heat, high airflow, precision digital thermostat, durable build, and even heat distribution | High BTU, silent radiant heat, portable, off-grid greenhouses | Dual heat modes (750W/1500W), adjustable thermostat, dustproof and overheat protection | Affordable, fast heat, overheat protection, small-medium greenhouses | Zero electricity cost; eco‑friendly supplemental warmth; perfect for early spring/fall frost prevention |
| $204.00 | $122.79 | $99.99 | $66.49 | $46.97 |
Wrap-Up
A dependable greenhouse heater with thermostat ensures plants thrive year-round. Choosing the right unit improves temperature stability, energy efficiency, and overall plant health. Electric heaters are perfect for precise, small-medium greenhouse control, while propane units provide powerful off-grid solutions for larger spaces. Paired with good insulation, fans, and thermostatic control, your greenhouse will maintain optimal temperatures, boost growth, and extend your growing season.
FAQs
What size greenhouse heater do I need?
Heater size depends on your greenhouse’s volume. Small setups need 1500W electric or 6,000–10,000 BTU propane. Medium setups require 1500–3000W electric or 10,000–15,000 BTU propane. Large greenhouses often need 15,000–25,000 BTU propane units for even heating.
Are electric greenhouse heaters safe?
Yes. Look for overheat protection, cool-touch surfaces, digital thermostats, and water-resistant housings. These features minimize risk in humid environments while delivering reliable warmth.
Can I use propane heaters in a greenhouse?
Yes, but ensure proper ventilation. Propane heaters need fresh airflow to prevent low oxygen levels. Safety features like tip-over protection and low oxygen sensors are essential.
What temperature should my greenhouse be at night?
Varies by plant type: 40–50°F for hardy greens, 55–65°F for tomatoes and herbs, 60–70°F for tropicals. Stable temperatures prevent stress and maintain growth.
Do I need a fan with my greenhouse heater?
Yes. Fans help distribute heat evenly, remove hot and cold zones, and improve thermostat accuracy, ensuring plants grow uniformly.
What is the most economical heater for a small greenhouse?
A 1500W electric heater with a digital thermostat cycles efficiently, preventing wasted energy while keeping plants at optimal temperatures.
Can solar heaters maintain a greenhouse in winter?
Solar heaters are best for supplemental heat. Alone, they rarely provide sufficient warmth during extremely cold periods.
How can I reduce heating costs?
Use insulation, seal leaks, add thermal curtains, use heat mats, and implement circulation fans. Pairing these with a thermostat-controlled heater maximizes efficiency.
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