The heater is not able to be converted to natural gas. Northern Tool item number 4907401 (SunStar model #SIU100-30-N5) would be the natural gas version of this heater.
SunStar, U- Tube Vacuum Infrared Tube Heater, Fuel Type Propane, Heat Output 100000 Btu/hour, Heat Type Infrared, Model# SIU100-30-L5

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- 30 Foot Emitter Tube Length. Pull Through System-Vacuum system utilizing a draft inducer pulls the products of combustion through combustion chamber for increased radiant efficiency and greater safety.
- Ideal for high heat loss areas including loading docks, warehouses, car repair shops, farm buildings or other spot heating applications where uniform energy distribution is desired.
- Standard Constuction hot rolled emitter tubes. Standard 4" flue and 4" outside combustion air supply to the control box in contaminated environments.
- The minimum mounting height is 14ft. above finished floor for uniform energy distribution and human comfort
- Requires the following clearances from any combustible material: 6in. above, 76in. below and 28in. from the sides of the heater
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