SUNPAK 25,000 BTU Natural Gas or Liquid Propane Infrared Heater


Regular price $2,411.00

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SUNPAK Model S25 heater is simple to operate and uses draft free and highly energy efficient infrared radiant energy just like the sun's warming rays. SUNPAK heaters warm object rather than trying to inefficiently heat the air. Each heater will heat about 10' x 10' area depending on wind conditions. SUNPAK heaters have been installed worldwide in thousands of premium residential and commercial installations. 

Residential and Commercial Heaters

The Sunpak Models S25 is an outdoor infrared heater available to be used with natural or propane gas. These heaters can be either wall or ceiling mounted. Infrared heater utilize a unique heating system that warms your guests like the sun. Sunpak heaters are specifically designed to provide heated comfort in an outdoor environment; the Model S25 has been used both in residential and commercial outdoor patios across the United States for years. 

Sunpak heaters are unvented need a continuous supply of fresh air and proper ventilation to operate safely. This heater is not to be used inside residences and other confined areas where the operational and safety requirements of this heater cannot be met.

The Sunpak Model S25 was crafted with a slim profile which works well in a variety of patio settings. The effectiveness of your Sunpak infrared heater will depend upon the wind velocity and air temperature primarily. 

We provide both Black and Stainless Steel Sunpak infrared heaters for your convenience.

Model S25 features:
  • 25,000 BTU output
  • Fully Automatic ON/OFF Control System
  • High-Efficiency Ceramic Infrared Burner System
  • Direct Spark Ignition with Auto Re-light and Flame Sensor System
  • Wall or Ceiling Mounting
  • Perfect for 7-1/2" to 9-1/2" Mounting Heights
  • 0 to 30° Mounting Angle (Natural Gas model only)
  • HI-Temp Powder Coated Black heater, Mounting Kit, and 24 Volt Transformer Included
  • Approximately 10' x 10' Heat Coverage
  • Available in Natural Gas or Liquid Propane
  • Made in the USA
Model S25 Options:
  • Stainless Steel Front Fascia Kit: #12020
  • Black Front Fascia Kit: #12020 2

 Clearance Requirements for S25 & S34:

Comfort Level: Typically you can expect the radiant heat to spread about 10 feet in each direction increasing the comfort level 5-10 deg F. outdoors.

Heater Installation:

Sunpak Heaters are intended to be installed by qualified personnel specifically trained and experienced in the installation of this type of heater and related system components. Some states or provinces require installation and service personnel to be licensed. If you state or province is such, be sure your contractor bears the appropriate license. Persons not qualified shall not attempt to install or repair this heater.

For Outdoor Use Only:

Sunpak heaters are designed for outside use only. They are not for use in residential dwelling or other confined areas. Semi-enclosed patio are permissible provided they have adequate permanent openings around the patio periphery and meet the requirements for outdoors as defined in the installation instructions.


Sunpak Heaters require adequate combustion air and ventilation to operate safely and efficiently. This requires openings above and below the level of the heater. Refer to the heater instructions for more detail.

Electrical Requirements:

Sunpak Heaters come with a 24 VAC spark ignition system which includes flame monitoring through flame rectification. All Sunpak S34 & S25 heaters with standard controls require an external 24 VAC Transformer. Transformer should never be placed inside the heater.

Gas Pressure:

Sunpak Heaters require a minimum inlet pressure of 6″ water column for natural gas and 11″ water column for propane gas. Gas pressure should never exceed 1/2 PSI or 14″ water column. For gas pressures exceeding 1/2 PSI a high-pressure regulator is required before the gas enters the heater.

Agency Certification:

Sunpak heaters are design certified by the CSA under the ANSI Z83.19 standard

Heater Gas Conversion:

The factory does not support converting heaters to different gases. Each heater has been setup and tested for a specific gas type.  Please make sure you select the correct gas type, Natural or Propane gas, before making your purchase.

SUNPAK Technical Sheet


SUNPAK STD Instruction – 2020

Mounting Kit Instructions