The motor that creates the flickering flame effect is noisy. 
I bought this from Twin Star they are idiots. I tried to followed the owner’s manual recommendation and enter the model number in the Twin Star database. The webpage would not accept any model or personal information. I called customer support and after waiting 20 minutes was told the customer service rep couldn’t enter my information but had to create a ticket. 
I give this one star because the retailer, Twin Star, is populated by knuckleheads.