Adjustable from 4200 to 8000 BTUs. An ideal primary or secondary heating source. Wave 8 heaters operate on low pressure LP gas, and can be wall mounted or used as portables. Equipped with a 100% safety shut-off valve to prevent accidental non-ignition fuel discharge. The built-in automatic Piezo electric spark starter will last for 20,000 starts. No electrical drain or battery connection.