Is the Waterbox 7225 loud?

[haitian_reefer]

This might seems like a stupid question, but this is important to me. I plan on buying a Peninsula Tank for my theater room and need to make sure it's dead silent.

Also, what's the difference between the 7225 and the 7226?

 

[VikS]

I don't have one so cant comment on noise level. They replaced the 7226 with 7225 last year. 7226 is not sold anymore.