Hearthrite Radiant Heat - 25BTU | Foster Fuels Home Products Hearthrite Radiant Heat – 25BTU Hearthrite Radiant Heat – 25BTU Brand: Empire Weight: 36 lbs Product Number: 933031006 Price: $339.00 Add to cart Product Description: No matter what type of space you need to heat, Empire’s American-made zone heaters will suit your needs perfectly. Empire Vent-Free Heaters are 99.9% fuel efficient. Because they don’t require outside venting, no heat is lost. And best of all, Empire Vent-Free units do not require electricity to operate. Empire Radiant models produce an infrared “radiant” heat that instantly adds warmth to you and objects in the room just like the sun. Warranty Information Manufacturer warranty is not valid unless installed by a Foster Fuels technician.