REM-B100LT-F 10,000 BTU Vent Free, LP REM-B100NT-F 10,000 BTU Vent Free, Natural Gas REM-B200LT-F 20,000 BTU Vent Free, LP REM-B200NT-F 20,000 BTU Vent Free, Natural Gas REM-B300LT-F 30,000 BTU Vent Free, LP REM-B300NT-F 30,000 BTU Vent Free, Natural Gas