Lazy, I'm also using cold bowls only - at the beginning of a fresh bowl at least. For sure a pre-heated bowl delivers much more vapor but I'm also ok with the performance of a cold Herborizer bowl. I like the different efx of the Herbo compared to the Showerhead. It's more hitting than the SH if you are fighting against pain and is sending you better to sleep. In these points the Herbo is working better at least. Also it's flavor is more refined than that of the SH.