HeatStar Blue Flame Heater — 20,000 BTU Natural Gas

HeatStar Blue Flame Heater — 20,000 BTU Natural Gas

The HeatStar Blue Flame Heater — 20,000 BTU Natural Gas delivers safe, clean-burning natural gas heat for greenhouses, shops, garages, or home spaces up to 700 square feet. At $316, it operates without electricity, requires no venting or chimney, and includes a built-in thermostat, blower fan, ODS safety sensor, and battery-operated electronic ignition. Can be wall-mounted or left freestanding (feet kit included).

⚠️ Installation kit required: This heater requires the 24-in Universal Gas Hook-Up Kit for proper installation. It can be purchased separately or bundled with this heater at checkout.

⚠️ Cannot be shipped to California.

What Are the Key Specs?

• Fuel: Natural Gas
• BTU output: 20,000 BTU (max)
• Heat coverage: Up to 700 sq. ft.
• Thermostat: Built-in
• Blower fan: Built-in 110V (factory-installed)
• Ignition: Electronic battery ignition (1 AA battery included)
• Efficiency: 99.9%
• Venting: Vent-free — no chimney or flue required
• ODS sensor: Built-in low oxygen shut-off
• Mounting: Wall-mountable or freestanding (feet kit included)
• Dimensions: 23.5" L × 12.5" W × 27.25" H
• Weight: 30 lbs
• Certification: CSA certified for use in the USA
• Warranty: 5-year limited

Which HeatStar Blue Flame Model Is Right for My Greenhouse?

The HeatStar Blue Flame lineup covers four configurations across two fuel types and two BTU outputs:

• 10,000 BTU Propane — $230 — 300 sq. ft., freestanding only, requires Remote Propane Vent-Free Installation Kit
• 20,000 BTU Propane — $316 — 700 sq. ft., wall-mountable or freestanding, requires Remote Propane Vent-Free Installation Kit
• 10,000 BTU Natural Gas — $230 — 300 sq. ft., wall-mountable or freestanding, requires 24-in Gas Hook-Up Kit
• 20,000 BTU Natural Gas — $316 — 700 sq. ft., wall-mountable or freestanding, requires 24-in Gas Hook-Up Kit

Choose natural gas if you have an existing gas supply line near your greenhouse. Choose propane if you don't have natural gas access or prefer a portable tank-based solution. Choose 20K BTU for greenhouses up to 700 sq. ft.; choose 10K BTU for spaces up to 300 sq. ft. All four models cannot ship to California.

Does This Heater Require an Installation Kit?

Yes — this heater requires the 24-in Universal Gas Hook-Up Kit for proper installation. This kit provides the gas line connection between your natural gas supply and the heater. It can be added to your cart separately or bundled with the heater at checkout. Do not purchase this heater without also ordering the installation kit.

Does It Work During a Power Outage?

Yes — the HeatStar Blue Flame Heater operates without electricity, making it a reliable heat source during power outages. The electronic ignition runs on a single AA battery (included). The built-in 110V blower fan requires electricity to operate, but the heater itself will still produce heat without it.

Is This Heater Safe for Greenhouse Use?

The HeatStar Blue Flame is a vent-free natural gas heater with a built-in low oxygen shut-off (ODS) sensor that automatically shuts the heater off if oxygen levels drop below a safe threshold — a critical safety feature for enclosed spaces like greenhouses. It is CSA certified for use in the USA. Note: this unit is not approved for use in bedrooms. Ensure adequate ventilation in your greenhouse when operating any gas heater.

Can This Heater Ship to California?

No — this heater cannot be shipped to California due to state regulations on vent-free gas heating products. If you're in California, contact the Grandio team to discuss alternative greenhouse heating options.

Key Features

• 20,000 BTU — heats up to 700 sq. ft.
• Natural gas fuel — connects to existing gas supply line
• 99.9% efficient — clean-burning operation
• Vent-free — no chimney or flue required
• Built-in ODS sensor — auto shut-off if oxygen drops
• Built-in thermostat and blower fan
• Works without electricity — battery electronic ignition
• Wall-mountable or freestanding — feet kit included
• CSA certified — USA approved
• 5-year limited warranty
• 24-in Gas Hook-Up Kit required — sold separately or bundled at checkout
• Cannot ship to California
• Ships in 1–2 business days

In stock — ships in 1–2 business days. Cannot be shipped to California.