When deployed, all players may use clean herbs on it. It will destroy the herbs providing 10 times the Herblore experience given for cleaning herbs, as well as Firemaking experience. Similarly to portables, it lasts for 5 minutes after being deployed, after which it must be redeployed to resume. However, it can be used an unlimited number of times and only works on clean herbs. Also, multiple herb burners can be placed as long as they're 5 spaces apart from each other. Approximately 1000 herbs can be burned per hour. Testing implies 28 herbs are burned in 1 minute 38 seconds or one herb in 3.5 seconds.
There was a bug where left-clicking on the burner with clean spirit weed would act as if there were no herbs to burn. The spirit weed had to be used with the burner instead. This was fixed on 10 July2017.