30,000 BTU's Hydraulic Thermostat 24"W x 6.5"D x 22H Made in the USA Propane. Blue Flame vs Radiant Heat Blue Flame heaters are just the blue gas flame burning whereas the radiant units are a ceramic brick that heats up and glows red. Both types are equally 99.9% efficient. Radiant produces more of a sunlight type heat versus the blue flame which is an atmospheric heat. The item "EMPIRE SR30T VENT FREE PROPANE HEATER" is in sale since Wednesday, April 22, 2020. This item is in the category "Home & Garden\Home Improvement\Heating, Cooling & Air\Heating & Cooling Appliances\Space Heaters". The seller is "tomasz646" and is located in Effort, Pennsylvania.