Is there a constant pilot light running all day all night?

Hello Bill, Thank you for reaching out. The Pleasant Hearth VFF3‑33PHDX Vent-Free Fireplace uses a millivolt control system with a safety pilot flame. The pilot is lit with a built-in piezo ignitor and, once lit, remains on continuously. This means the pilot light runs all the time, even when the main burner is not operating, ensuring that the fireplace can ignite safely and reliably whenever needed. Should you need any additional information, please feel free to give us a call at 877-447-4768 or email at customerservice@ghpgroupinc.com . We appreciate your business and look forward to serving you in the future. Thank you! – GHP Group.