recommendations for infrared garage heater?

Any recommendations on a natural gas garage heater. Garage is about 28x28 (784 sqft.) inside, about 8.5 ft high, concrete floor. Would be used for occasional use in the winter time.
I can't really find any good brands or names. Someone told me about one that is circular, no exhaust needed, no electricty needed.
Thanks, samurai.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Site Timeline is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.