"According to the ads, the Amish Fireplace produces an "amazing" 5,119 BTU. However, "any 1500 watt heater will provide that amount of BTU, so there is nothing really 'amazing' about that from an engineering standpoint," said Dr. Fiona Doyle, Professor of Materials Science and Engineering at the University of California, Berkeley.
"Whether a space heater costs $40.00 or $300.00, 1500 watts cannot magically be converted into more BTU. The maximum amount of heat energy is 1500 watts and it cannot produce more than that," Dr. Doyle said."