Maintaining a warm environment in your greenhouse during colder months can be a challenge. Without proper heating, your plants risk stunted growth or even frost damage. Propane heaters are an excellent solution, providing efficient, reliable warmth to keep your greenhouse thriving when temperatures drop.
Choosing the right propane heater involves considering several factors, including heating capacity, safety features, and ease of use. A great propane heater should effectively warm your greenhouse space while being safe and simple to operate. Whether you have a small, dedicated greenhouse or a portable solution, understanding your needs will guide you to the best option.
In this roundup, we review the top five propane heaters ideal for small greenhouses. Each product has been selected based on its unique features, performance, and user feedback to help you make an informed decision.
Comparing key specifications can simplify your choice:
| Features | Mr. Heater 9,000 BTU | ProCom Liquid Propane Ventless | ProCom Heating Liquid Propane | ThermoMate 18000 BTU | Mr. Heater 3,800 BTU |
|---|---|---|---|---|---|
| Heating Capacity | 4,000/9,000 BTU | 10,000 BTU | 10,000 BTU | 18,000 BTU | 3,800 BTU |
| Coverage Area | 225 sq. ft. | 300 sq. ft. | 500 sq. ft. | 450 sq. ft. | 95 sq. ft. |
| Safety Features | Low oxygen shutdown | ODS sensor | ODS sensor | ODS and tip-over protection | ODS sensor |
| Operation Type | Portable | Ventless | Ventless | Portable | Portable |
| Fuel Connection | 20 lb cylinder | 10 ft hose | Wall mount or floor | 20 lb cylinder | 20 lb cylinder |
Mr. Heater 9,000 BTU Port…
The Mr. Heater 9,000 BTU Portable Buddy is a versatile option for small greenhouses and outdoor spaces. With its radiant heat output of 4,000 or 9,000 BTU, it’s well-suited for areas up to 225 square feet. This heater is perfect for gardeners needing reliable warmth to nurture their plants.
What makes this heater stand out is its ability to operate safely in both indoor and outdoor environments. Its low oxygen safety system ensures peace of mind during use. The dual temperature settings also allow for customization based on your greenhouse’s current conditions.
One limitation is that it may not provide sufficient heat for larger greenhouses or those with poor insulation. It’s also best suited for smaller areas where it can effectively maintain warmth.
- Heating output: 4,000/9,000 BTU
- Covers up to 225 sq. ft.
- Low oxygen safety shutoff
- Portable design
- Two temperature settings
Best for: Ideal for small greenhouses needing portable heating solutions.
ProCom Liquid Propane Ven…
The ProCom Liquid Propane Ventless heater provides a powerful 10,000 BTU output, effectively warming spaces up to 300 square feet. It’s a practical choice for those looking to heat their greenhouse efficiently without the need for venting.
This model features a thermostat control, allowing it to maintain a consistent temperature by cycling the burner on and off. Its high efficiency of 99.9% means minimal energy waste, making it an economical choice for long-term use.
However, the ventless design may not be ideal for very small or tightly sealed spaces. Users should ensure there’s adequate airflow to avoid any safety issues. It also requires a 10-foot hose and regulator for operation, which adds to initial setup considerations.
- Heating output: 10,000 BTU
- Covers up to 300 sq. ft.
- Thermostat control
- 99.9% energy efficient
- Requires external hose setup
Best for: Perfect for mid-sized greenhouses needing efficient, thermostat-controlled heating.
ProCom Heating Liquid Pro…
This ProCom Heating Liquid Propane model offers a unique blue flame heating technology. With a maximum output of 10,000 BTU, it can effectively heat areas up to 500 square feet. It’s an excellent choice for larger small greenhouses or those requiring more intense heat.
Its stylish design allows for wall mounting or floor placement, offering flexibility in setup. The built-in thermostat control provides three heating levels, ensuring customizable comfort based on your greenhouse’s needs.
On the downside, its larger size may make it less portable than other options. Additionally, the installation may require more planning due to its wall-mount capability.
- Heating output: 10,000 BTU
- Covers up to 500 sq. ft.
- High/Medium/Low thermostat
- Wall mount or floor setup
- Push-button ignition
Best for: Ideal for larger small greenhouses needing versatile installation options.
ThermoMate 18000 BTU Prop…
The ThermoMate 18000 BTU propane heater is a powerful solution for heating larger areas, making it suitable for greenhouses up to 450 square feet. Its high BTU output is particularly beneficial in colder climates where rapid heating is necessary.
This model is designed for quiet operation, making it suitable for environments where noise may be a concern. With three heating modes, users can easily adjust the heat level to suit varying temperature needs throughout the day.
A drawback is that it may be overkill for smaller greenhouses, leading to unnecessarily high heat levels. Additionally, it requires careful positioning to ensure safety features, like the tip-over protection, are effective.
- Heating output: 18,000 BTU
- Covers up to 450 sq. ft.
- Quiet operation (32 dB)
- Three heating modes
- Portable with locking casters
Best for: Best for larger greenhouses needing substantial heating power.
Mr. Heater 3,800 BTU Litt…
The Mr. Heater 3,800 BTU Little Buddy is an excellent compact option for extremely small greenhouses or spaces that need minimal heating. With a maximum output of 3,800 BTU, it can adequately heat areas up to 95 square feet.
This portable heater is easy to set up, featuring a one-button ignition for quick starts. Its small footprint allows it to fit into tight spaces without consuming much floor area, making it perfect for cramped environments.
However, its limited heating capacity means it’s not suitable for larger greenhouses or those with poor insulation. It also requires careful monitoring to avoid overheating a small area.
- Heating output: 3,800 BTU
- Covers up to 95 sq. ft.
- One-button ignition
- Compact design
- Uses little floor space
Best for: Ideal for tiny greenhouses needing basic, portable heating solutions.
How We Chose These Products
We evaluated each product based on heating efficiency, safety features, and user-friendliness. Each heater was assessed for its ability to maintain a comfortable temperature in small greenhouse conditions, with a focus on their coverage area and BTU output.
Customer feedback and expert reviews also played a crucial role in our selection. We prioritized models that provide reliable performance, ensuring users can maintain optimal growing conditions for their plants.
Buying Guide: What Really Matters
When selecting a propane heater for your small greenhouse, consider the space’s size and insulation. Choose a heater with a BTU output suited to your specific area to ensure effective heating. Additionally, look for safety features like oxygen depletion sensors and tip-over protection to ensure safe operation.
Ease of use is also vital. Look for models with straightforward ignition systems and adjustable settings. This will make it easier to manage temperature fluctuations throughout the day, especially as outdoor conditions change.
Our Top Recommendation
For those who need a combination of efficiency and safety, the ProCom Liquid Propane Ventless heater stands out as our top recommendation. It offers substantial heating power with thermostat control, making it ideal for consistently maintaining comfortable greenhouse temperatures. For smaller spaces, the Mr. Heater 9,000 BTU Portable Buddy is an excellent choice, delivering reliable warmth in a compact, portable design.
Frequently Asked Questions
Can propane heaters be used indoors? Yes, many propane heaters are designed for indoor use, but always check for safety features like oxygen depletion sensors.
How do I determine the BTU needed for my greenhouse? Measure the square footage of your greenhouse and choose a heater with a BTU output that matches or exceeds that area.
Are ventless propane heaters safe? Ventless heaters can be safe if used in well-ventilated areas with built-in safety features to monitor oxygen levels.
How long will a propane tank last? The runtime for a propane tank varies based on the heater’s BTU settings; typically, a 20 lb tank can last anywhere from 6 to 69 hours depending on the heater’s output.
