First, the unit does make some noise. If you mount it on the wall, I would use a couple of 2 x 4s behind the unit to mount the unit on. This will cut down on the vibration when it fires up. The unit produces 14.5 GPM with a 40-45 degree rise. There is a graph on the Eternal website. If you run a little to close, invest the $300 and buy a GU195. It produces 19.5 GPM. The unit works great all through the Northeast. Questions can be answered by corporate office in Garland Texas. Also, use some water saving heads. You won’t notice a difference.