Bosch AQ3 AquaStar Horizontal Vent Terminator

Easy to install

I had the authorized Bosch Aquastar installation professional survey my home for installaion of this water heater. He took one look at the AQ3 and said it wasn't appropriate. For one thing, Bosch mandates that the exhaust be constructed of 4" stainless steel. This equipment is 3" and the main exhaust vent pipe is aluminum. In some climates, the fumes react with moisture in the air and form acid (think acid rain). The acid and water accumulate in this corrugated pipe and drip back into the unit. This means that the main vent will fail, and then cause the water heater to fail.Unless you live in the high desert, don't use this installation kit. I'm returning mine.

This is a great product that makes your work easier. Make sure you make holes in wall first and install it then mount your hot water heater. Manafacturer could have put some extra pieces more in package for the price they charge

You need it for proper installation - but the cost is way too much for what it is - not Amazon's fault - Bosch's fault.

This is an excellent kit for any unit that will be vented horizontally that does not exceed 18 inches from the outside of your house. In other words, you need to be mounting the water heater against the outside wall of your home for this kit to work. If you are mounting your unit against such a wall and the wall is less than 18 inches in thickness, this is a perfect kit and will have everything you need. The only downside is that the kit does not do a good job of telling you how to install the required wall heat shield. A quick call to the company can provide you with the help you will need to install it.