Best for
Small North American greenhouses needing frost protection on a correctly sized circuit.
#8 in the buying orderHeatingBuy when needed
Canopia Portable Greenhouse Fan Heater 1500W NA
A purpose-built 1500W fan heater is a better fit than an exposed household space heater, but the greenhouse heat-loss math still decides whether it is enough.
- Current price
- Check a current US distributor
- Checked September 1, 2026
- Review type
- Independent desk review
- Not a physical product test
Skip if
Your heat-loss calculation exceeds the output, the greenhouse has no safe GFCI-protected supply, or you expect a 1500W heater to hold warm-growing temperatures through severe cold.
Hidden cost
A dedicated or upgraded electrical circuit, GFCI protection, energy use, and backup protection for outages can cost more than the heater.
Why it made the list
The buyer case
It combines a digital thermostat, fan, overheat reset, and IPX4 splash resistance in a product intended for greenhouse use.
Compatibility comes first
The North American model is 1500W. Confirm voltage, plug, circuit capacity, clearance, and the temperature rise your structure actually needs.
Installation boundary
Keep the heater clear of plants, fabric, water spray, and combustible material. Follow the manual and local electrical rules.
Our verdict
A defensible frost-protection pick for a small greenhouse after sizing. The honest answer for a large or poorly insulated structure may be a different heating system, not more portable heaters.
Primary sources
Product facts come from these direct sources. They are kept separate from the purchase button, and none is rewritten through an affiliate redirect.
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This is a proper 24V climate-system thermostat, not a universal plug-in controller for any heater or fan.
- Best for
- A greenhouse heating or cooling system designed for 24V thermostat control.
- Skip if
- You are trying to plug a normal 120V appliance directly into it. That is not what this thermostat is for.
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Bio Green Palma 1500W Greenhouse Heater
$149.99 at biogreen-products.com
The default heater for a 6x8 to 8x12 twin-wall greenhouse: 5,120 BTU, a real thermostat, IPX4 splash protection and a two-year warranty on a standard outlet.
- Best for
- Owners of a 6x8 to 8x12 greenhouse who need frost protection or a modest overnight hold on a single GFCI-protected 120 V circuit.
- Skip if
- Your heat-loss math needs more than about 5,000 BTU per hour, you have single glass in a cold climate, or you cannot give it a GFCI-protected outlet of its own.
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Bio Green Phoenix 2800W Greenhouse Heater
$299.99 at biogreen-products.com, down from $329.99
The step up when one 1500 W heater is not enough: 9,554 BTU on a 240 V circuit, with a thermostat that runs from minus 58 to 79 degrees F.
- Best for
- A 10x12 or 12x16 twin-wall greenhouse, or a smaller single-glass house, where the heat-loss number lands between 5,000 and 9,500 BTU per hour.
- Skip if
- You do not have, and will not install, a 240 V circuit in the greenhouse. On 120 V this heater does not exist as an option.